Pub Date : 2024-04-05DOI: 10.1007/s10934-024-01591-y
Gunel Imanova, Sakin Jabarov, Teymur Agayev, Yusif Aliyev, Anar Aliyev, Ilkhom Bekpulatov, Selimkhan Aliyev
The constituent parts of systems where radiation-catalytic processes occur usually differ in terms of mass and electron density, structural characteristics, electro-physical and chemical properties. Therefore, interaction between phases in any form has a sharp effect on the direction and parameters of the processes in individual components. The resulting X-ray diffraction pattern was mainly determined by the atomic plane (ε), the intensity of the obtained peaks, the corresponding syngony of the sample, the lattice size, density, lattice constants, and the distance between the phase groups. The X-ray diffraction data were processed using the Full prof program. Full-profile processing of NaNO3 X-ray diffraction data showed that the initial sample has a triclinic structure. The scientific component of the article is of interest be- cause it touches upon the issues of structural transformations of NaNO3 under the action of gamma radiation. The radiation- heterogeneous processes of water decomposition NaNO3 have been studied. The kinetics of buildup of molecular hydrogen in the radiolysis processes of water decomposition has been examined. Hydrogen generation by water splitting is reported in NaNO3 + H2Oabs., NaNO3 + H2Oflu. systems using gamma radiation and 300 K temperature. This indicates that in the case of finding NaNO3 in the volume of water, there is an effective transfer of energy from the solid phase to water molecules. The presence of the second slow stage of radiolysis on the kinetic curves indicates that there is a diffusion-hindered stage of heterogeneous radiolysis of water in the presence of nanoparticles at 300 K.
发生辐射催化过程的系统各组成部分通常在质量和电子密度、结构特征、电物理和化学性质方面存在差异。因此,任何形式的相间相互作用都会对单个成分的过程方向和参数产生剧烈影响。所得到的 X 射线衍射图样主要取决于原子平面(ε)、所获峰的强度、样品的相应共轭度、晶格尺寸、密度、晶格常数以及相群之间的距离。X 射线衍射数据使用 Full prof 程序处理。对 NaNO3 X 射线衍射数据的全剖面处理显示,初始样品具有三菱结构。这篇文章的科学意义在于它触及了 NaNO3 在伽马射线作用下的结构转变问题。文章研究了 NaNO3 水分解的辐射异相过程。研究了水分解的辐射分解过程中分子氢的积累动力学。在伽马辐射和 300 K 温度条件下,报告了在 NaNO3 + H2Oabs.、NaNO3 + H2Oflu.这表明,在水体积中发现 NaNO3 的情况下,固相中的能量有效地转移到了水分子中。动力学曲线上存在第二个缓慢的辐射分解阶段,这表明在 300 K 温度下,纳米粒子存在时,水的异质辐射分解存在一个扩散受阻阶段。
{"title":"Gamma radiation mediated catalytic process for hydrogen generation by water decomposition on NaNO3 surface","authors":"Gunel Imanova, Sakin Jabarov, Teymur Agayev, Yusif Aliyev, Anar Aliyev, Ilkhom Bekpulatov, Selimkhan Aliyev","doi":"10.1007/s10934-024-01591-y","DOIUrl":"https://doi.org/10.1007/s10934-024-01591-y","url":null,"abstract":"<p>The constituent parts of systems where radiation-catalytic processes occur usually differ in terms of mass and electron density, structural characteristics, electro-physical and chemical properties. Therefore, interaction between phases in any form has a sharp effect on the direction and parameters of the processes in individual components. The resulting X-ray diffraction pattern was mainly determined by the atomic plane (ε), the intensity of the obtained peaks, the corresponding syngony of the sample, the lattice size, density, lattice constants, and the distance between the phase groups. The X-ray diffraction data were processed using the Full prof program. Full-profile processing of NaNO<sub>3</sub> X-ray diffraction data showed that the initial sample has a triclinic structure. The scientific component of the article is of interest be- cause it touches upon the issues of structural transformations of NaNO<sub>3</sub> under the action of gamma radiation. The radiation- heterogeneous processes of water decomposition NaNO<sub>3</sub> have been studied. The kinetics of buildup of molecular hydrogen in the radiolysis processes of water decomposition has been examined. Hydrogen generation by water splitting is reported in NaNO<sub>3</sub> + H<sub>2</sub>O<sub>abs</sub>., NaNO<sub>3</sub> + H<sub>2</sub>O<sub>flu</sub>. systems using gamma radiation and 300 K temperature. This indicates that in the case of finding NaNO<sub>3</sub> in the volume of water, there is an effective transfer of energy from the solid phase to water molecules. The presence of the second slow stage of radiolysis on the kinetic curves indicates that there is a diffusion-hindered stage of heterogeneous radiolysis of water in the presence of nanoparticles at 300 K.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-04DOI: 10.1007/s10934-024-01587-8
R. N. Viswanath, C. Lakshmanan, T. S. Sampath Kumar
We report in this article, the Dysprosium doping effects on microstructure and mechanical properties of nanoporous metallic gold, synthesized by electrochemical dealloying of Ag70Au30 and Ag70Au29Dy1 alloys. It is shown that these dealloyed nanoporous metallic materials exhibit the mean ligament diameter in a length scale of 5–10 nm. The variation of ligament diameter in pure and Dysprosium doped nanoporous Au with annealing temperature influences their mechanical properties. Higher microhardness value has been obtained around 10 nm ligament diameter on both pure and Dysprosium doped nanoporous gold. The maximum values of Vickers hardness HV obtained from the analysis of indentation diagonals with applied load are close to the HV value reported for bulk gold. Since the nanoporous metallic materials behave in a way like compressible sponge materials, we used the well-known density scaling equation for the determination of ligament yield strength of pure and Dysprosium doped nanoporous gold with ligament diameter. The results obtained have been finally compared with literature reports.
{"title":"Doping effects on mechanical properties of nanoporous gold systems","authors":"R. N. Viswanath, C. Lakshmanan, T. S. Sampath Kumar","doi":"10.1007/s10934-024-01587-8","DOIUrl":"https://doi.org/10.1007/s10934-024-01587-8","url":null,"abstract":"<p>We report in this article, the Dysprosium doping effects on microstructure and mechanical properties of nanoporous metallic gold, synthesized by electrochemical dealloying of Ag<sub>70</sub>Au<sub>30</sub> and Ag<sub>70</sub>Au<sub>29</sub>Dy<sub>1</sub> alloys. It is shown that these dealloyed nanoporous metallic materials exhibit the mean ligament diameter in a length scale of 5–10 nm. The variation of ligament diameter in pure and Dysprosium doped nanoporous Au with annealing temperature influences their mechanical properties. Higher microhardness value has been obtained around 10 nm ligament diameter on both pure and Dysprosium doped nanoporous gold. The maximum values of Vickers hardness H<sub>V</sub> obtained from the analysis of indentation diagonals with applied load are close to the H<sub>V</sub> value reported for bulk gold. Since the nanoporous metallic materials behave in a way like compressible sponge materials, we used the well-known density scaling equation for the determination of ligament yield strength of pure and Dysprosium doped nanoporous gold with ligament diameter. The results obtained have been finally compared with literature reports.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-03DOI: 10.1007/s10934-024-01579-8
Abstract
Recently, the direct ink writing (DIW) of hierarchical porous copper ((Cu)) (HP-({text{Cu}})) for lithium metal battery applications has attracted significant attention. To achieve this, (Cu) ink with ideal rheological properties and high particle loading is necessary. However, to date, no work focusing on systematic (Cu) ink development with (Cu) particle loading more than 95 (wt%) has been reported. Hence, in the present work, a novel (Cu) ink with a particle loading of more than 95 (wt%,) and polylactic acid (PLA) as a binder has been developed. The rheological behavior of the (Cu) ink with different amounts of (Cu) loading i.e. 93, 95 and 97 (wt%) respectively were investigated. Moreover, the modelling using the Herschel-Bulkey equation was done to establish the rheology. All the prepared inks showed viscoelastic and shear thinning behaviour. Moreover, the ink having 97(wt%)(Cu) loading exhibited optimum rheology with a shear elastic modulus of around ({10}^{5} Pa) in the linear viscoelastic area. Subsequently, DIW using the prepared (Cu) inks followed by sintering was performed. The morphological study of the 3D printed (Cu) green samples and sintered samples was performed and it was found that the variation in (Cu) particle loading significantly affected the density and volumetric shrinkage. Finally, an HP-({text{Cu}}) sample having a pore size less than 200 (mu m) was fabricated using DIW and sintering to validate the efficacy of the developed (Cu) ink. Proper interparticle bonding between the (Cu) particles was observed indicating that the developed ink is suitable for the fabrication of complex (Cu) parts for lithium metal battery application.
{"title":"Development of a high particle loading novel copper ink for the fabrication of a three-dimensional hierarchical porous structure using direct ink writing and sintering","authors":"","doi":"10.1007/s10934-024-01579-8","DOIUrl":"https://doi.org/10.1007/s10934-024-01579-8","url":null,"abstract":"<h3>Abstract</h3> <p>Recently, the direct ink writing (DIW) of hierarchical porous copper <span> <span>((Cu))</span> </span> (HP-<span> <span>({text{Cu}})</span> </span>) for lithium metal battery applications has attracted significant attention. To achieve this, <span> <span>(Cu)</span> </span> ink with ideal rheological properties and high particle loading is necessary. However, to date, no work focusing on systematic <span> <span>(Cu)</span> </span> ink development with <span> <span>(Cu)</span> </span> particle loading more than 95 <span> <span>(wt%)</span> </span> has been reported. Hence, in the present work, a novel <span> <span>(Cu)</span> </span> ink with a particle loading of more than 95 <span> <span>(wt%,)</span> </span> and polylactic acid (PLA) as a binder has been developed. The rheological behavior of the <span> <span>(Cu)</span> </span> ink with different amounts of <span> <span>(Cu)</span> </span> loading i.e. 93, 95 and 97 <span> <span>(wt%)</span> </span> respectively were investigated. Moreover, the modelling using the Herschel-Bulkey equation was done to establish the rheology. All the prepared inks showed viscoelastic and shear thinning behaviour. Moreover, the ink having 97<span> <span>(wt%)</span> </span> <span> <span>(Cu)</span> </span> loading exhibited optimum rheology with a shear elastic modulus of around <span> <span>({10}^{5} Pa)</span> </span> in the linear viscoelastic area. Subsequently, DIW using the prepared <span> <span>(Cu)</span> </span> inks followed by sintering was performed. The morphological study of the 3D printed <span> <span>(Cu)</span> </span> green samples and sintered samples was performed and it was found that the variation in <span> <span>(Cu)</span> </span> particle loading significantly affected the density and volumetric shrinkage. Finally, an HP-<span> <span>({text{Cu}})</span> </span> sample having a pore size less than 200 <span> <span>(mu m)</span> </span> was fabricated using DIW and sintering to validate the efficacy of the developed <span> <span>(Cu)</span> </span> ink. Proper interparticle bonding between the <span> <span>(Cu)</span> </span> particles was observed indicating that the developed ink is suitable for the fabrication of complex <span> <span>(Cu)</span> </span> parts for lithium metal battery application.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140581068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-03DOI: 10.1007/s10934-024-01585-w
Abstract
In this article, the suitability of utilization of porous lumen structure of Halloysite (Hal) nanoclay has been studied elaborately. To utilize the lumen structure for membrane development, the effect of temperature, pressure and time on the porous lumen feature and subsequent use of the clay in pristine form as a membrane coating material for separation purposes at specified temperatures shows the importance of this study. The present study investigates structural changes in Halloysite nanoclay's inherent porous tubular morphology. Membranes are prepared by coating clay-alumina porous support tube with Halloysite sol under pressure and temperature of 100 and 160 °C for 24, 48 and 64 h, respectively. XRD and FTIR reveal that the tubular structure remains intact under experimental conditions. In contrast, the morphology of pristine Hal powder treated at the specified temperature and under in situ developed autogenous pressure shows a significant textural change in the nanotubular morphology observed from FESEM. At 100 °C, lumen porosity remains intact, but at 160 °C, under higher pressure, lumen mouth sealing, conjoining and coalescence of the halloysite nanotubes (HNT) result. In addition, for both temperatures under existing operating pressure, the effect of 24 h time duration on morphology is less. For practical viability, a preliminary study for dye removal is carried out with H1 membrane coating, which shows promising %rejection values. This study on powders and membrane coatings might thus help to assign new application fields, such as membrane-based separation utilizing the porous nature of HNT by controlling different process parameters.
摘要 本文详细研究了利用纳米霍洛石(Hal)多孔内腔结构的适宜性。为了将内腔结构用于膜开发,温度、压力和时间对多孔内腔特征的影响,以及随后在特定温度下将原始形态的粘土用作分离目的的膜涂层材料,都表明了这项研究的重要性。本研究调查了霍洛石纳米粘土固有多孔管状形态的结构变化。在压力和温度分别为 100 和 160 °C 的条件下,将哈洛来石溶胶涂覆在粘土-氧化铝多孔支撑管上,分别持续 24、48 和 64 小时,制备出膜。XRD 和 FTIR 显示,管状结构在实验条件下保持完好。与此相反,在特定温度和原位自生压力下处理的原始 Hal 粉末的形态显示,从 FESEM 观察到的纳米管形态发生了显著的纹理变化。在 100 °C 时,管腔孔隙率保持不变,但在 160 °C 时,在更高的压力下,管腔口密封、连接和霍洛石纳米管 (HNT) 凝聚。此外,在现有工作压力下的两种温度下,24 小时的持续时间对形态的影响较小。为了切实可行,使用 H1 膜涂层进行了染料去除的初步研究,结果显示了很好的去除率。因此,对粉末和膜涂层的研究可能有助于确定新的应用领域,例如通过控制不同的工艺参数,利用 HNT 的多孔性进行膜分离。
{"title":"Change in lumen pore structure of halloysite nanotube membrane coating under varying pressure, time and temperature","authors":"","doi":"10.1007/s10934-024-01585-w","DOIUrl":"https://doi.org/10.1007/s10934-024-01585-w","url":null,"abstract":"<h3>Abstract</h3> <p>In this article, the suitability of utilization of porous lumen structure of Halloysite (Hal) nanoclay has been studied elaborately. To utilize the lumen structure for membrane development, the effect of temperature, pressure and time on the porous lumen feature and subsequent use of the clay in pristine form as a membrane coating material for separation purposes at specified temperatures shows the importance of this study. The present study investigates structural changes in Halloysite nanoclay's inherent porous tubular morphology. Membranes are prepared by coating clay-alumina porous support tube with Halloysite sol under pressure and temperature of 100 and 160 °C for 24, 48 and 64 h, respectively. XRD and FTIR reveal that the tubular structure remains intact under experimental conditions. In contrast, the morphology of pristine Hal powder treated at the specified temperature and under in situ developed autogenous pressure shows a significant textural change in the nanotubular morphology observed from FESEM. At 100 °C, lumen porosity remains intact, but at 160 °C, under higher pressure, lumen mouth sealing, conjoining and coalescence of the halloysite nanotubes (HNT) result. In addition, for both temperatures under existing operating pressure, the effect of 24 h time duration on morphology is less. For practical viability, a preliminary study for dye removal is carried out with H1 membrane coating, which shows promising %rejection values. This study on powders and membrane coatings might thus help to assign new application fields, such as membrane-based separation utilizing the porous nature of HNT by controlling different process parameters.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zeolites synthesis using a combination of tetraethylammonium hydroxide (TEAOH) and 1,6-diaminohexane (DAH) as organic structure-directing agents (OSDAs) has been studied in order to understand how they acted during the synthesis. This combination can crystallize four zeolites: beta, ZSM-12, ZSM-48, and silicalite-1. TEAOH is found to direct the synthesis of beta, and ZSM-12 zeolites, whereas DAH directs the synthesis of ZSM-48 zeolite. On the other hand, the two organic components are found to have a cooperative role in the crystallization process of silicalite-1, with greater templating ability for TEAOH compared to DAH. The use of a supplementary organic component does not affect the degree of filling of the primary OSDA in the structure or the morphology of the obtained zeolites. The carbon dioxide (CO2) adsorption capacity of the zeolites obtained was evaluated at a temperature of 293 K in a pressure range of 0 to 1 atm. The relationship between the surface properties of the zeolites and their adsorption behavior was studied. Beta zeolite had the highest adsorption capacity with 2.9 mmol/g, while ZSM-48 zeolite had the lowest adsorption capacity with only 0.7 mmol/g.
{"title":"Synthesis, characterization, and evaluation of the CO2 adsorption capacities of beta, ZSM-12, ZSM-48, and silicalite-1 zeolites obtained in the presence of tetraethylammonium hydroxide and 1,6-diaminohexane as organic structure-directing agents","authors":"Ilyes Bouledjouad, Djamal Dari, Rachid Ghezini, Fatiha Djafri, Mohamed Sassi","doi":"10.1007/s10934-024-01603-x","DOIUrl":"https://doi.org/10.1007/s10934-024-01603-x","url":null,"abstract":"<p>Zeolites synthesis using a combination of tetraethylammonium hydroxide (TEAOH) and 1,6-diaminohexane (DAH) as organic structure-directing agents (OSDAs) has been studied in order to understand how they acted during the synthesis. This combination can crystallize four zeolites: beta, ZSM-12, ZSM-48, and silicalite-1. TEAOH is found to direct the synthesis of beta, and ZSM-12 zeolites, whereas DAH directs the synthesis of ZSM-48 zeolite. On the other hand, the two organic components are found to have a cooperative role in the crystallization process of silicalite-1, with greater templating ability for TEAOH compared to DAH. The use of a supplementary organic component does not affect the degree of filling of the primary OSDA in the structure or the morphology of the obtained zeolites. The carbon dioxide (CO<sub>2</sub>) adsorption capacity of the zeolites obtained was evaluated at a temperature of 293 K in a pressure range of 0 to 1 atm. The relationship between the surface properties of the zeolites and their adsorption behavior was studied. Beta zeolite had the highest adsorption capacity with 2.9 mmol/g, while ZSM-48 zeolite had the lowest adsorption capacity with only 0.7 mmol/g.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1007/s10934-024-01586-9
Arxhel S. F. Nanda, Grandprix T. M. Kadja
In general, hierarchical zeolite synthesis will produce waste, which will cause many problems for environmental pollution. The waste that comes from the synthesis of zeolites, such as the use of hazardous chemicals from the use of many solvents, additional templates, silica sources used, and other precursors that are not environmentally friendly. One solution to the problem is to use bio-based templates. The advantage of using this bio-based template is that it is environmentally friendly, reduces dependence on hazardous chemicals, and supports sustainability for bio-based templates such as carbohydrates, chitin, and others. The use of the previously mentioned templates in zeolite synthesis can produce hierarchical pores, high crystallinity, and catalytic properties that are not inferior to conventional zeolites obtained, and more cost-effective. The efforts are expected to fulfill the principles of green chemistry, which prioritizes the environment to provide better prospects for the synthesis of hierarchical zeolites in the future.
{"title":"Bio-based templates for generating hierarchical zeolites: an overview for greener synthesis pathway","authors":"Arxhel S. F. Nanda, Grandprix T. M. Kadja","doi":"10.1007/s10934-024-01586-9","DOIUrl":"https://doi.org/10.1007/s10934-024-01586-9","url":null,"abstract":"<p>In general, hierarchical zeolite synthesis will produce waste, which will cause many problems for environmental pollution. The waste that comes from the synthesis of zeolites, such as the use of hazardous chemicals from the use of many solvents, additional templates, silica sources used, and other precursors that are not environmentally friendly. One solution to the problem is to use bio-based templates. The advantage of using this bio-based template is that it is environmentally friendly, reduces dependence on hazardous chemicals, and supports sustainability for bio-based templates such as carbohydrates, chitin, and others. The use of the previously mentioned templates in zeolite synthesis can produce hierarchical pores, high crystallinity, and catalytic properties that are not inferior to conventional zeolites obtained, and more cost-effective. The efforts are expected to fulfill the principles of green chemistry, which prioritizes the environment to provide better prospects for the synthesis of hierarchical zeolites in the future.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140198119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rodlike ZSM-5 zeolite microspheres (R-Z5) were synthesized via a seed induced hydrothermal method with S-1 seeds in the presence of β-cyclodextrin (CD). The synthesized ZSM-5 zeolites were characterized with XRD, SEM, N2 adsorption and desorption, NH3-TPD, the catalytic performance of R-Z5 catalysts was studied for the methanol to propylene (MTP) reaction. The effects of the ratio of CD/SiO2 on the morphologies and textural properties of the products were discussed in detail. A possible formation process of R-Z5 was proposed. The results showed that CD played a key role in the preparation of R-Z5, which could be ascribed to the amphipathy of CD for the formation of rodlike ZSM-5 crystals. Compared with the conventional seed induced method, R-Z5 zeolites possessed the larger BET surface area and mesopore volumes and the more moderate acidic sites. Moreover, the synthesized R-Z5 catalysts exhibited excellent conversion activity (64 h) and propylene selectivity (41.35%) in the primary catalytic performance of MTP reaction.
{"title":"Facile synthesis of rodlike ZSM-5 zeolite microspheres and catalytic performance in methanol to propylene reaction","authors":"Hengbao Chen, Tianyang Li, Zehan Li, Bing Li, Manli Zhang","doi":"10.1007/s10934-024-01590-z","DOIUrl":"https://doi.org/10.1007/s10934-024-01590-z","url":null,"abstract":"<p>Rodlike ZSM-5 zeolite microspheres (R-Z5) were synthesized via a seed induced hydrothermal method with S-1 seeds in the presence of β-cyclodextrin (CD). The synthesized ZSM-5 zeolites were characterized with XRD, SEM, N<sub>2</sub> adsorption and desorption, NH<sub>3</sub>-TPD, the catalytic performance of R-Z5 catalysts was studied for the methanol to propylene (MTP) reaction. The effects of the ratio of CD/SiO<sub>2</sub> on the morphologies and textural properties of the products were discussed in detail. A possible formation process of R-Z5 was proposed. The results showed that CD played a key role in the preparation of R-Z5, which could be ascribed to the amphipathy of CD for the formation of rodlike ZSM-5 crystals. Compared with the conventional seed induced method, R-Z5 zeolites possessed the larger BET surface area and mesopore volumes and the more moderate acidic sites. Moreover, the synthesized R-Z5 catalysts exhibited excellent conversion activity (64 h) and propylene selectivity (41.35%) in the primary catalytic performance of MTP reaction.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140197622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1007/s10934-024-01581-0
Abstract
Magnetised attapulgite (ATP-Fe3O4) adsorbent was synthesised using a sonochemistry approach for the solid phase extraction of As3+ from stimulated and unrefined crude oil samples. The average size of the Fe3O4 nanoparticles estimated from the Transmission Electron Microscopy (TEM) image was 10 nm. The TEM analysis also showed that Fe3O4 nanoparticles agglomerated in the ATP’s tube and on its surface. The X-ray diffraction analysis (XRD) indicates that the crystallinity of the ATP reduced after the magnetisation process. The saturation magnetisation of the ATP-Fe3O4 was determined to be only 2.8 emu g-1. Under the optimum conditions (pH = 7, adsorbent dosage = 0.6 g, contact time = 90 min and sample volume = 50 mL), the As3+ removal was more than 98% for both types of oil. The limits of detection (LOD) and relative standard deviations (RSD%) were 2.88 ng mL-1 and 0.3423%, respectively. The adsorption process follows the pseudo-first-order kinetic model (R2 = 0.9696) and adheres to the Langmuir isotherm model (R2 = 0.9925). The reusability study showed that ATP-Fe3O4 is highly stable and can be reused five times with almost 100% removal efficiency. This research outcome aligns with the United Nations Sustainable Goal 7, Affordable and Clean Energy.
{"title":"Magnetic attapulgite synthesized via Sonochemistry: an innovative strategy for efficient solid phase extraction of As3+ from simulated and unrefined crude oil samples","authors":"","doi":"10.1007/s10934-024-01581-0","DOIUrl":"https://doi.org/10.1007/s10934-024-01581-0","url":null,"abstract":"<h3>Abstract</h3> <p>Magnetised attapulgite (ATP-Fe<sub>3</sub>O<sub>4</sub>) adsorbent was synthesised using a sonochemistry approach for the solid phase extraction of As<sup>3+</sup> from stimulated and unrefined crude oil samples. The average size of the Fe<sub>3</sub>O<sub>4</sub> nanoparticles estimated from the Transmission Electron Microscopy (TEM) image was 10 nm. The TEM analysis also showed that Fe<sub>3</sub>O<sub>4</sub> nanoparticles agglomerated in the ATP’s tube and on its surface. The X-ray diffraction analysis (XRD) indicates that the crystallinity of the ATP reduced after the magnetisation process. The saturation magnetisation of the ATP-Fe<sub>3</sub>O<sub>4</sub> was determined to be only 2.8 emu g<sup>-1</sup>. Under the optimum conditions (pH = 7, adsorbent dosage = 0.6 g, contact time = 90 min and sample volume = 50 mL), the As<sup>3+</sup> removal was more than 98% for both types of oil. The limits of detection (LOD) and relative standard deviations (RSD%) were 2.88 ng mL<sup>-1</sup> and 0.3423%, respectively. The adsorption process follows the pseudo-first-order kinetic model (R<sup>2</sup> = 0.9696) and adheres to the Langmuir isotherm model (R<sup>2</sup> = 0.9925). The reusability study showed that ATP-Fe<sub>3</sub>O<sub>4</sub> is highly stable and can be reused five times with almost 100% removal efficiency. This research outcome aligns with the United Nations Sustainable Goal 7, Affordable and Clean Energy.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140197829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1007/s10934-024-01563-2
Karthika Devi, Chellapandian Kannan
CO2 is the most prevalent greenhouse gas that traps heat and raises the global temperature. To stabilize or reduce concentrations of this greenhouse gas, it is mandatory to decompose CO2. So we have synthesized AlPO4 and ZnO4-AlPO4 catalysts using tetrapropylammonium hydroxide (TPAOH) as a template. The synthesized catalysts are systematically characterized by physicochemical methods. XRD analysis proved that AlPO4 has a tetrahedral framework. But the ZnO4-AlPO4 has two separate frameworks, such as a novel ZnO4 and AlPO4, in which the ZnO4 framework is sandwiched between the AlPO4 frameworks. As of now, such kind of sandwich framework has not yet been reported. Textural evaluation shows that there is a formation of two types of pores, namely cylindrical (AlPO4) and slit-shaped pore (ZnO4-AlPO4). The conversion of cylindrical pores into slit pores in ZnO4-AlPO4 may be due to the formation of a ZnO4 sandwiched framework in AlPO4. It is confirmed by the BET analysis. The acidity and thermal stability of the materials are confirmed by the TPD and TGA analyses. The acidity of AlPO4 (0.44 mmol/g) may be due to the deposition of Al3+ in the pores and surface of the material. The HR-TEM analysis proved the morphology of the synthesized materials. The synthesized materials are applied for CO2 decomposition. The maximum conversion is reached above 95% and oxygen selectivity is above 55% in both catalysts.
{"title":"A sandwich framework effect on the conversion of cylindrical pore into slit pore and its catalytic application","authors":"Karthika Devi, Chellapandian Kannan","doi":"10.1007/s10934-024-01563-2","DOIUrl":"https://doi.org/10.1007/s10934-024-01563-2","url":null,"abstract":"<p>CO<sub>2</sub> is the most prevalent greenhouse gas that traps heat and raises the global temperature. To stabilize or reduce concentrations of this greenhouse gas, it is mandatory to decompose CO<sub>2</sub>. So we have synthesized AlPO<sub>4</sub> and ZnO<sub>4</sub>-AlPO<sub>4</sub> catalysts using tetrapropylammonium hydroxide (TPAOH) as a template. The synthesized catalysts are systematically characterized by physicochemical methods. XRD analysis proved that AlPO<sub>4</sub> has a tetrahedral framework. But the ZnO<sub>4</sub>-AlPO<sub>4</sub> has two separate frameworks, such as a novel ZnO<sub>4</sub> and AlPO<sub>4</sub>, in which the ZnO<sub>4</sub> framework is sandwiched between the AlPO<sub>4</sub> frameworks. As of now, such kind of sandwich framework has not yet been reported. Textural evaluation shows that there is a formation of two types of pores, namely cylindrical (AlPO<sub>4</sub>) and slit-shaped pore (ZnO<sub>4</sub>-AlPO<sub>4</sub>). The conversion of cylindrical pores into slit pores in ZnO<sub>4</sub>-AlPO<sub>4</sub> may be due to the formation of a ZnO<sub>4</sub> sandwiched framework in AlPO<sub>4</sub>. It is confirmed by the BET analysis. The acidity and thermal stability of the materials are confirmed by the TPD and TGA analyses. The acidity of AlPO<sub>4</sub> (0.44 mmol/g) may be due to the deposition of Al<sup>3+</sup> in the pores and surface of the material. The HR-TEM analysis proved the morphology of the synthesized materials. The synthesized materials are applied for CO<sub>2</sub> decomposition. The maximum conversion is reached above 95% and oxygen selectivity is above 55% in both catalysts.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140197833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1007/s10934-024-01573-0
Jhonny Villarroel-Rocha, José J. Arroyo-Gómez, Deicy Barrera, Karim Sapag
It is known that the use of the Dubinin–Radushkevich method in micro-mesoporous samples does not give adequate values of micropore volumes, unlike when the samples contain only microporous. Based on that, in this work, we propose an easy method to calculate a reliable micropore volume (VμP) of micro-mesoporous (nanopores) samples, separating the microporous region from the experimental isotherm. For this, the original isotherm is modified, estimating the thickness of the adsorbed layer (t) as a function of relative pressure and changing the external surface area (Sext) to obtain a Type I adsorption isotherm in the microporous region; then, the DR method can be applied to the modified isotherm. This proposal, named the DR_t method, allows the calculation of a reliable VμP of any nanoporous material using different adsorbates. Using this method, we analyzed adsorbents of distinct nature (i.e., carbons and silicas) with different adsorbates as N2 and O2 at 77 K, Ar at 87 K, and CO2 at 273 K. We used this method to calculate VμP in different samples and compare them with those obtained with the traditional DR method, highlighting that unlike the latter the DR_t method showed similar and consistent results with the different adsorbates. Therefore, the values of micropore volume calculated using the DR_t method demonstrate consistency across various adsorbates, not only for N2 but especially for CO2, which is suggested to analyze narrow micropore volumes.
众所周知,在微多孔样品中使用 Dubinin-Radushkevich 方法无法获得足够的微孔体积值,这与样品仅含有微孔时的情况不同。在此基础上,我们在本研究中提出了一种简便的方法来计算微多孔(纳米孔)样品的可靠微孔体积(VμP),将微孔区域与实验等温线分开。为此,需要对原始等温线进行修正,将吸附层厚度 (t) 作为相对压力的函数进行估算,并改变外表面积 (Sext),以获得微孔区域的 I 型吸附等温线;然后,可将 DR 方法应用于修正后的等温线。这一建议被命名为 DR_t 方法,可以利用不同的吸附剂计算出任何纳米多孔材料的可靠 VμP。利用这种方法,我们分析了不同性质的吸附剂(即碳和硅)与不同的吸附剂,如 77 K 时的 N2 和 O2、87 K 时的 Ar 和 273 K 时的 CO2。我们利用这种方法计算了不同样品中的 VμP,并将其与传统 DR 方法得出的结果进行了比较,结果表明 DR_t 方法与后者不同,对不同吸附剂的计算结果相似且一致。因此,使用 DR_t 方法计算出的微孔体积值在各种吸附剂中显示出一致性,不仅适用于 N2,尤其适用于 CO2,建议用于分析狭窄的微孔体积。
{"title":"A new and reliable method to obtain micropore volume in nanoporous solids by gas adsorption based on Dubinin works and the thickness of the adsorbed layer","authors":"Jhonny Villarroel-Rocha, José J. Arroyo-Gómez, Deicy Barrera, Karim Sapag","doi":"10.1007/s10934-024-01573-0","DOIUrl":"https://doi.org/10.1007/s10934-024-01573-0","url":null,"abstract":"<p>It is known that the use of the Dubinin–Radushkevich method in <i>micro-mesoporous samples</i> does not give adequate values of <i>micropore volumes,</i> unlike when the samples contain only microporous. Based on that, in this work, we propose an easy method to calculate a reliable micropore volume (<i>V</i><sub>μP</sub>) of micro-mesoporous (nanopores) samples, separating the microporous region from the experimental isotherm. For this, the original isotherm is modified, estimating the thickness of the adsorbed layer (<i>t</i>) as a function of relative pressure and changing the external surface area (<i>S</i><sub>ext</sub>) to obtain a Type I adsorption isotherm in the microporous region; then, the DR method can be applied to the modified isotherm. This proposal, named the <b>DR_t method</b>, allows the calculation of a reliable <i>V</i><sub>μP</sub> of <i>any</i> nanoporous material using different adsorbates. Using this method, we analyzed adsorbents of distinct nature (i.e., carbons and silicas) with different adsorbates as N<sub>2</sub> and O<sub>2</sub> at 77 K, Ar at 87 K, and CO<sub>2</sub> at 273 K. We used this method to calculate <i>V</i><sub>μP</sub> in different samples and compare them with those obtained with the traditional DR method, highlighting that unlike the latter the DR_t method showed similar and consistent results with the different adsorbates. Therefore, the values of micropore volume calculated using the DR_t method demonstrate consistency across various adsorbates, not only for N<sub>2</sub> but especially for CO<sub>2</sub>, which is suggested to analyze narrow micropore volumes.</p>","PeriodicalId":660,"journal":{"name":"Journal of Porous Materials","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}