In the era of renewable and sustainable energy, perovskite materials remain pioneers as energy harvesting materials, be it thermoelectric waste heat harvesting or photovoltaic solar cell application. Oxide perovskite material is an emerging thermoelectric material in solving energy shortage issues through waste heat recovery. The chemical and structural stabilities, oxidation resistance, and cost-effective and straightforward manufacturing process are a few advantages of the oxide-based thermoelectric materials. The perovskite thermoelectric materials and module thereof does not require any vacuum bagging for operation at high temperature, irrespective of the application environment. Perovskite CaMnO3 displays a high Seebeck coefficient (S~-350 μV/K) due to correlated electron structure and low thermal conductivity (3 W m-1 K-1) but high electrical resistivity simultaneously. The electrical resistivity of CaMnO3 can be tuned by electron doping at the Ca-site and Mn-site. Electron doping by substituting Mn3+ with trivalent rare-earth ions increases the carrier concentration in the CaMnO3 system by partially reducing Mn4+ to Mn3+, improving electrical conductivity without altering the Seebeck coefficient. The dual-doped Ca1-xYbx/2Lux/2MnO3-based n-type perovskite thermoelectric material showed a much higher power factor than undoped CaMnO3 and proved to be an efficient perovskite from the application point of view. The thermoelectric module, in combination with CaMnO3 as an n-type element and Ca3Co4O9 or doped-Ca3Co4O9 as the p-type element, is the most efficient device reported to date. The lab-scale power generation experiment is carried out for 4-element and 36-element modules consisting of perovskite Ca1-xYbx/2Lux/2MnO3 as n-type elements and Ca3Co4O9 as p-type elements. The results showed the challenges of up-scaling the perovskite module for high-temperature waste heat harvesting applications.
{"title":"Perovskite Oxide Thermoelectric Module - A Way Forward","authors":"Abanti Nag","doi":"10.21926/cr.2304024","DOIUrl":"https://doi.org/10.21926/cr.2304024","url":null,"abstract":"In the era of renewable and sustainable energy, perovskite materials remain pioneers as energy harvesting materials, be it thermoelectric waste heat harvesting or photovoltaic solar cell application. Oxide perovskite material is an emerging thermoelectric material in solving energy shortage issues through waste heat recovery. The chemical and structural stabilities, oxidation resistance, and cost-effective and straightforward manufacturing process are a few advantages of the oxide-based thermoelectric materials. The perovskite thermoelectric materials and module thereof does not require any vacuum bagging for operation at high temperature, irrespective of the application environment. Perovskite CaMnO<sub>3</sub> displays a high Seebeck coefficient (<em>S</em>~-350 μV/K) due to correlated electron structure and low thermal conductivity (3 W m<sup>-1</sup> K<sup>-1</sup>) but high electrical resistivity simultaneously. The electrical resistivity of CaMnO<sub>3</sub> can be tuned by electron doping at the Ca-site and Mn-site. Electron doping by substituting Mn<sup>3+</sup> with trivalent rare-earth ions increases the carrier concentration in the CaMnO<sub>3</sub> system by partially reducing Mn<sup>4+</sup> to Mn<sup>3+</sup>, improving electrical conductivity without altering the Seebeck coefficient. The dual-doped Ca<sub>1</sub><sub>-</sub><sub>x</sub>Yb<sub>x/2</sub>Lu<sub>x/2</sub>MnO<sub>3</sub>-based <em>n</em>-type perovskite thermoelectric material showed a much higher power factor than undoped CaMnO<sub>3</sub> and proved to be an efficient perovskite from the application point of view. The thermoelectric module, in combination with CaMnO<sub>3</sub> as an <em>n</em>-type element and Ca<sub>3</sub>Co<sub>4</sub>O<sub>9</sub> or doped-Ca<sub>3</sub>Co<sub>4</sub>O<sub>9</sub> as the <em>p</em>-type element, is the most efficient device reported to date. The lab-scale power generation experiment is carried out for 4-element and 36-element modules consisting of perovskite Ca<sub>1</sub><sub>-</sub><sub>x</sub>Yb<sub>x/2</sub>Lu<sub>x/2</sub>MnO<sub>3</sub> as <em>n</em>-type elements and Ca<sub>3</sub>Co<sub>4</sub>O<sub>9</sub> as <em>p</em>-type elements. The results showed the challenges of up-scaling the perovskite module for high-temperature waste heat harvesting applications.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136064038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Michel Z. Fidelis, Elaine de Paula, Eduardo Abreu, Maria E.K. Fuziki, Onelia A. A. dos Santos, Rodrigo Brackmann, Giane G. Lenzi
Due to its similar characteristics to titanium, niobium has become an attractive alternative in photocatalytic processes. Research indicates that titania has an optimal percentage of phases resulting in a commercial catalyst, P25, that contains more than 70% anatase with a minor amount of rutile and a small amount of amorphous phase. On the other hand, for Nb2O5, percentage optimization was little explored in the literature, which consists of studying the phases obtained via heat treatment individually and in different percentages via chemometric studies. In this context, the present research proposes to study the T/H phases of Nb2O5 and their mixture. The catalysts were used to assess the catalytic activity in salicylic acid (SA) degradation. The results demonstrated that a theoretical mixture of T/H phase, with an optimal ratio of 69.1% of the H phase, had more significant SA degradation than the tests with the pure phases. The mixture was able to degrade 87.9% of SA in 60 minutes.
{"title":"Nb<sub>2</sub>O<sub>5</sub>: Percentage Effect of T/H Phase and Evaluation of Catalytic Activity, a Preliminary Study","authors":"Michel Z. Fidelis, Elaine de Paula, Eduardo Abreu, Maria E.K. Fuziki, Onelia A. A. dos Santos, Rodrigo Brackmann, Giane G. Lenzi","doi":"10.21926/cr.2303023","DOIUrl":"https://doi.org/10.21926/cr.2303023","url":null,"abstract":"Due to its similar characteristics to titanium, niobium has become an attractive alternative in photocatalytic processes. Research indicates that titania has an optimal percentage of phases resulting in a commercial catalyst, P25, that contains more than 70% anatase with a minor amount of rutile and a small amount of amorphous phase. On the other hand, for Nb<sub>2</sub>O<sub>5</sub>, percentage optimization was little explored in the literature, which consists of studying the phases obtained via heat treatment individually and in different percentages via chemometric studies. In this context, the present research proposes to study the T/H phases of Nb<sub>2</sub>O<sub>5</sub> and their mixture. The catalysts were used to assess the catalytic activity in salicylic acid (SA) degradation. The results demonstrated that a theoretical mixture of T/H phase, with an optimal ratio of 69.1% of the H phase, had more significant SA degradation than the tests with the pure phases. The mixture was able to degrade 87.9% of SA in 60 minutes.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136060229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Accumulation of wax inside the catalyst pores during transient cobalt-catalyzed Fischer-Tropsch synthesis (FTS) leads to unfavorable product distribution and low activity by imposing internal mass transfer limitations. The condensation of paraffin severely changes the apparent product stream that actually leaves the reactor before the catalyst pores are filled completely and the steady state is reached. Thus, the product distribution of the transient FTS is less complex than expected in comparison to the steady-state FTS and increasingly consists of hydrocarbons (HCs) with an average chain length in the range of kerosene (C9-C17). So, in order to prevent FTS from reaching a steady state, the pores are drained periodically by hydrogenolysis (HGL). The alternating HGL is realized by a switch from syngas (H2, CO) to pure hydrogen at a reaction temperature in the range of 210°C to 240°C. The alternating process leads to an improvement in kerosene selectivity of 48%, 37%, and 28% at 210°C, 220°C and 240°C, respectively. Furthermore, the influence of temperature on the hydrogenolysis of long-chain HCs was experimentally investigated. It was found that temperature affects methane selectivity severely. A high hydrogenolysis temperature is favorable as this leads to a severely decreased overall methane selectivity and, thus to a higher production rate of alkanes within the carbon number range of 9 to 17.
{"title":"Enhancing Kerosene Selectivity of Fischer-Tropsch Synthesis by Periodical Pore Drainage Via Hydrogenolysis","authors":"Carsten Unglaub, Andreas Jess","doi":"10.21926/cr.2303022","DOIUrl":"https://doi.org/10.21926/cr.2303022","url":null,"abstract":"Accumulation of wax inside the catalyst pores during transient cobalt-catalyzed Fischer-Tropsch synthesis (FTS) leads to unfavorable product distribution and low activity by imposing internal mass transfer limitations. The condensation of paraffin severely changes the apparent product stream that actually leaves the reactor before the catalyst pores are filled completely and the steady state is reached. Thus, the product distribution of the transient FTS is less complex than expected in comparison to the steady-state FTS and increasingly consists of hydrocarbons (HCs) with an average chain length in the range of kerosene (C<sub>9</sub>-C<sub>17</sub>). So, in order to prevent FTS from reaching a steady state, the pores are drained periodically by hydrogenolysis (HGL). The alternating HGL is realized by a switch from syngas (H<sub>2</sub>, CO) to pure hydrogen at a reaction temperature in the range of 210°C to 240°C. The alternating process leads to an improvement in kerosene selectivity of 48%, 37%, and 28% at 210°C, 220°C and 240°C, respectively. Furthermore, the influence of temperature on the hydrogenolysis of long-chain HCs was experimentally investigated. It was found that temperature affects methane selectivity severely. A high hydrogenolysis temperature is favorable as this leads to a severely decreased overall methane selectivity and, thus to a higher production rate of alkanes within the carbon number range of 9 to 17.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135878769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the oil distillate fraction alkylation process, a modified Zr zeolite ZSM-5 was obtained and studied. The modification was executed using a method that impregnated ZSM-5 with a 5% solution of ZrOCl2∙6H2O. X-ray diffraction studies were conducted on zeolite ZSM-5, zirconyl chloride modifier ZrOCl2∙6H2O, and modified zeolite ZSM-5-ZrO2, which was calcined at temperatures of 200, 400, and 550°C. The results revealed that the phase composition of modified ZSM-5-ZrO2 zeolite samples varied depending on the calcination temperature. It was determined that only at a temperature of 550°C did the modified ZSM-5 catalyst contain three phases belonging to ZrSi24O50, ZrO2, and ZSM-5. The emergence of the ZrO2 phase occurred at a calcination temperature of 550°C. An increase in temperature from 200 to 550°C facilitated the transition of the amorphous phase to the crystalline phase. The crystal structure of the ZSM-5-ZrO2 catalyst, calcined at 550°C, contributed to a rise in its activity. Consequently, during alkylation with catalytic cracking gases, the viscosity-temperature properties of the T-30 turbine oil distillate fraction significantly improved (the viscosity index increased from 49.9 to 137). An increase in zeolite ZSM-5 activity was demonstratd due to the introduction of zirconium and an elevated calcination temperature to 550°C.
{"title":"Research and Application of Modified ZSM-5 for the Process of Alkylation of Oil Distillate Fractions","authors":"G. Huseynova, N. Aliyeva, Gular Gаsimоvа","doi":"10.21926/cr.2303021","DOIUrl":"https://doi.org/10.21926/cr.2303021","url":null,"abstract":"In the oil distillate fraction alkylation process, a modified Zr zeolite ZSM-5 was obtained and studied. The modification was executed using a method that impregnated ZSM-5 with a 5% solution of ZrOCl2∙6H2O. X-ray diffraction studies were conducted on zeolite ZSM-5, zirconyl chloride modifier ZrOCl2∙6H2O, and modified zeolite ZSM-5-ZrO2, which was calcined at temperatures of 200, 400, and 550°C. The results revealed that the phase composition of modified ZSM-5-ZrO2 zeolite samples varied depending on the calcination temperature. It was determined that only at a temperature of 550°C did the modified ZSM-5 catalyst contain three phases belonging to ZrSi24O50, ZrO2, and ZSM-5. The emergence of the ZrO2 phase occurred at a calcination temperature of 550°C. An increase in temperature from 200 to 550°C facilitated the transition of the amorphous phase to the crystalline phase. The crystal structure of the ZSM-5-ZrO2 catalyst, calcined at 550°C, contributed to a rise in its activity. Consequently, during alkylation with catalytic cracking gases, the viscosity-temperature properties of the T-30 turbine oil distillate fraction significantly improved (the viscosity index increased from 49.9 to 137). An increase in zeolite ZSM-5 activity was demonstratd due to the introduction of zirconium and an elevated calcination temperature to 550°C.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"303 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132690137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
With increasing population levels and rapidly growing industries worldwide, the purification of water contaminated with different impurities is one of the biggest challenges we face in recent times. Photocatalysis holds great potential as an efficient mineralization process to remove the foreign matter present in wastewater. Rapid advancement in innovative materials development has made photocatalysis the frontrunner among different water treatment methods. Our main priority lies in different strategic approaches to improve photocatalytic performance. This review discusses the recent breakthrough in implementing the photocatalytic mechanism for successful wastewater treatment. Challenges and future prospects in this technological field have also been discussed.
{"title":"Recent Development of Photocatalytic Application Towards Wastewater Treatment","authors":"Preeta Datta, Subhasish Roy","doi":"10.21926/cr.2303020","DOIUrl":"https://doi.org/10.21926/cr.2303020","url":null,"abstract":"With increasing population levels and rapidly growing industries worldwide, the purification of water contaminated with different impurities is one of the biggest challenges we face in recent times. Photocatalysis holds great potential as an efficient mineralization process to remove the foreign matter present in wastewater. Rapid advancement in innovative materials development has made photocatalysis the frontrunner among different water treatment methods. Our main priority lies in different strategic approaches to improve photocatalytic performance. This review discusses the recent breakthrough in implementing the photocatalytic mechanism for successful wastewater treatment. Challenges and future prospects in this technological field have also been discussed.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131958688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mona Liza Santana, Aline X. S. Santos, G. L. V. Júnior, S. Assis
Microorganisms that are capable of degrading lignocellulolytic materials can produce extracellular cellulase complexes. Microorganisms are an excellent alternative for the production of cellulolytic complex, since these sources have a high power of multiplication. In this work, we researched the production by the fungus Moniliophthora perniciosa. The production and pH and temperature optimum optimization were studied by Response surface methodology and carboxymethylcellulase (CMCase) characterization. Thermal stability was evaluated at 60, 70, 80 and 90°C. Doehlert experimental design was employed using inductor concentration in five levels (3.0, 4.5, 6.0, 7.5 and 9.0 g L-1 of yeast extract) and fermentation time was studied in three levels (7, 14 and 21 days). The production of CMC enzyme was higher in the concentration of 7.0 g L-1 of yeast extract and 19 days fermentation time. CMCase showed optimum pH and temperature at 7.2 and 47°C, respectively. The CMCase retained 88.66% of residual activity after 30 minutes of incubation at 90°C. Due to the characteristic of thermal stability, this enzyme will be studied to be expressed in recombinant microorganisms.
能够降解木质纤维素水解物质的微生物可以产生胞外纤维素酶复合物。微生物是生产纤维素水解复合体的一个极好的替代品，因为这些来源具有很高的增殖能力。本论文主要研究了利用黑霉菌生产黑霉的方法。通过响应面法和羧甲基纤维素酶(CMCase)的表征，研究了该酶的产量和pH、温度的优化。在60、70、80和90°C时评估热稳定性。采用Doehlert试验设计，采用诱导剂浓度为3.0、4.5、6.0、7.5和9.0 g L-1的酵母浸膏5个水平，分别研究7、14和21 d的发酵时间。当酵母浸膏浓度为7.0 g L-1，发酵时间为19 d时，CMC酶的产量较高。CMCase的最佳pH值为7.2℃，最佳温度为47℃。90℃孵育30分钟后，CMCase保留了88.66%的剩余活性。由于其热稳定性的特点，我们将研究该酶在重组微生物中的表达。
{"title":"Production and Characterization of Carboxymethylcellulase by Submerged Fermentation of Moniliophthora perniciosa","authors":"Mona Liza Santana, Aline X. S. Santos, G. L. V. Júnior, S. Assis","doi":"10.21926/cr.2302019","DOIUrl":"https://doi.org/10.21926/cr.2302019","url":null,"abstract":"Microorganisms that are capable of degrading lignocellulolytic materials can produce extracellular cellulase complexes. Microorganisms are an excellent alternative for the production of cellulolytic complex, since these sources have a high power of multiplication. In this work, we researched the production by the fungus Moniliophthora perniciosa. The production and pH and temperature optimum optimization were studied by Response surface methodology and carboxymethylcellulase (CMCase) characterization. Thermal stability was evaluated at 60, 70, 80 and 90°C. Doehlert experimental design was employed using inductor concentration in five levels (3.0, 4.5, 6.0, 7.5 and 9.0 g L-1 of yeast extract) and fermentation time was studied in three levels (7, 14 and 21 days). The production of CMC enzyme was higher in the concentration of 7.0 g L-1 of yeast extract and 19 days fermentation time. CMCase showed optimum pH and temperature at 7.2 and 47°C, respectively. The CMCase retained 88.66% of residual activity after 30 minutes of incubation at 90°C. Due to the characteristic of thermal stability, this enzyme will be studied to be expressed in recombinant microorganisms.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117222119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Christopher K. Russell, A. Saxena, Jeffrey T. T. Miller
Previous studies on the conversion of olefins to aromatics with bifunctional Ga- or Zn-ZSM-5 catalysts have concluded that benzene, toluene, and xylenes (BTX) yields are significantly higher than for ZSM-5 alone. These results were attributed to the higher aromatic dehydrogenation rate of Ga or Zn. In this study, a highly active, bifunctional PtZn/SiO2 (1.3 wt% Pt, 2.6 wt% Zn) with H-ZSM-5 (Si/Al = 40) catalyst is investigated for propene aromatization at 723 K and 823 K. At low to moderate propene conversions, in addition to BTX, small alkanes and olefins are produced. Many of these may also be converted to aromatics at higher propene conversion while others are not, for example, methane, ethane and propane. When compared at equivalent space velocity or propene conversion, the bifunctional catalyst has a much higher selectivity to aromatics than ZSM-5; however, when compared at equivalent conversion of all reactive intermediates, the bifunctional catalyst exhibits very similar BTX selectivity. At 723 K, for ZSM-5 the primary non-reactive by-products are propane and butane; while, for the bifunctional catalyst the major non-reactive product is propane. At 823 K, both ZSM-5 and the bifunctional catalyst convert propane and butane to aromatics increasing the aromatic yields, and the by-products are methane and ethane.
{"title":"Influence of Bifunctional PtZn/SiO2 and H-ZSM-5 Catalyst on the Rates and Selectivity of Propene Aromatization","authors":"Christopher K. Russell, A. Saxena, Jeffrey T. T. Miller","doi":"10.21926/cr.2302018","DOIUrl":"https://doi.org/10.21926/cr.2302018","url":null,"abstract":"Previous studies on the conversion of olefins to aromatics with bifunctional Ga- or Zn-ZSM-5 catalysts have concluded that benzene, toluene, and xylenes (BTX) yields are significantly higher than for ZSM-5 alone. These results were attributed to the higher aromatic dehydrogenation rate of Ga or Zn. In this study, a highly active, bifunctional PtZn/SiO2 (1.3 wt% Pt, 2.6 wt% Zn) with H-ZSM-5 (Si/Al = 40) catalyst is investigated for propene aromatization at 723 K and 823 K. At low to moderate propene conversions, in addition to BTX, small alkanes and olefins are produced. Many of these may also be converted to aromatics at higher propene conversion while others are not, for example, methane, ethane and propane. When compared at equivalent space velocity or propene conversion, the bifunctional catalyst has a much higher selectivity to aromatics than ZSM-5; however, when compared at equivalent conversion of all reactive intermediates, the bifunctional catalyst exhibits very similar BTX selectivity. At 723 K, for ZSM-5 the primary non-reactive by-products are propane and butane; while, for the bifunctional catalyst the major non-reactive product is propane. At 823 K, both ZSM-5 and the bifunctional catalyst convert propane and butane to aromatics increasing the aromatic yields, and the by-products are methane and ethane.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131490318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this review article, the main methods of synthesizing and applications of hypercrosslinked materials are studied. Porous structure, high specific surface area, and pore volume make these materials an excellent choice for different applications including gas storage, carbon capture, and molecular separation, removal of pollutants, catalysis, and drug delivery and sensing. In this review article, catalytic applications are particularly considered.
{"title":"A Concise Review on Hypercrosslinked Polymers with Catalytic Applications","authors":"Mahmoud Parvazinia","doi":"10.35702/catalres.10013","DOIUrl":"https://doi.org/10.35702/catalres.10013","url":null,"abstract":"In this review article, the main methods of synthesizing and applications of hypercrosslinked materials are studied. Porous structure, high specific surface area, and pore volume make these materials an excellent choice for different applications including gas storage, carbon capture, and molecular separation, removal of pollutants, catalysis, and drug delivery and sensing. In this review article, catalytic applications are particularly considered.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135693338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lidiane A. Morais, Francisco L. Castro, G. Fernandes, M. D. Araujo, Mirna F. Farias, A. Guedes, V. J. Fernandes Jr., A. S. Araújo
The TiO2/MCM-41 nanomaterials were synthesized by impregnation with an excess solvent with different percentages of titanium dioxide. They were used for catalytic degradation of Benzene Toluene Ethylbenzene and Xylenes (BTEX) in the presence of hydrogen peroxide in aqueous media. The obtained materials were characterized by X-ray Diffraction, nitrogen adsorption-desorption using the BET method and Fourier Transform Infrared Spectroscopy. The nanostructured phase of the hexagonal ordered materials was obtained even after modification with titanium oxide and calcination. The characterizations have proven the effectiveness of the synthesis method used to incorporate titanium with anatase structure impregnated in the nanoporous of the MCM-41 material. Anatase is the main active phase of TiO2 to oxidize organic compounds. The catalytic evaluation wascarried out in a semi-bath reactor with 20 mL of a mixture containing BTEX (100 mg/L), hydrogen peroxide (2.0 mol/L) and TiO2/MCM-41 (2.0 g/L) in aqueous media. The reactions were carried out at a temperature of 60°C for 5 hours, and the analyses were performed by gas chromatography with a photoionization detector and headspace sampler. The catalytic tests showed satisfactory results with more than 95% of conversion, where the catalyst 48%TiO2/MCM-41 presented higher performance.
{"title":"Synthesis and Characterization of MCM-41 Nanomaterials Containing Titanium and Application for Catalytic Oxidation of BTEX","authors":"Lidiane A. Morais, Francisco L. Castro, G. Fernandes, M. D. Araujo, Mirna F. Farias, A. Guedes, V. J. Fernandes Jr., A. S. Araújo","doi":"10.21926/cr.2302017","DOIUrl":"https://doi.org/10.21926/cr.2302017","url":null,"abstract":"The TiO2/MCM-41 nanomaterials were synthesized by impregnation with an excess solvent with different percentages of titanium dioxide. They were used for catalytic degradation of Benzene Toluene Ethylbenzene and Xylenes (BTEX) in the presence of hydrogen peroxide in aqueous media. The obtained materials were characterized by X-ray Diffraction, nitrogen adsorption-desorption using the BET method and Fourier Transform Infrared Spectroscopy. The nanostructured phase of the hexagonal ordered materials was obtained even after modification with titanium oxide and calcination. The characterizations have proven the effectiveness of the synthesis method used to incorporate titanium with anatase structure impregnated in the nanoporous of the MCM-41 material. Anatase is the main active phase of TiO2 to oxidize organic compounds. The catalytic evaluation wascarried out in a semi-bath reactor with 20 mL of a mixture containing BTEX (100 mg/L), hydrogen peroxide (2.0 mol/L) and TiO2/MCM-41 (2.0 g/L) in aqueous media. The reactions were carried out at a temperature of 60°C for 5 hours, and the analyses were performed by gas chromatography with a photoionization detector and headspace sampler. The catalytic tests showed satisfactory results with more than 95% of conversion, where the catalyst 48%TiO2/MCM-41 presented higher performance.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"128 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124238929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mufei Xiao, Vitalii Petranovskii, Armando Reyes-Serrato, Joel Antúnez-García, Jesús L. A. Ponce-Ruiz, Constanza I. Koop-Santa, Fabian N. Murrieta-Rico, Rosario I. Yocupicio-Gaxiola, Jonathan Zamora-Mendieta, Nikifor Rakov
INTRODUCTION Zeolites are crystalline microporous aluminosilicates that have found wide-ranging industrial applications in catalysis [1-3], as well as in other processes [4,5]. The main feature that fundamentally distinguishes them from other carriers is a system of voids strictly ordered in shape and size, which are an element of their crystalline structure. Catalysts are materials that allow important reactions to be more selective, faster, and require less energy. Coinage metals (copper, silver, and gold) possess noteworthy optical and electrical properties, are often found as important components in most catalysts, and are known for their high activity as well as many other important properties. Nanoclusters of these metals are widely used in biomedical imaging, remote sensing, labeling, etc. Coinage metal nanostructures possess noteworthy optical, and electrical properties, that are inspiring serious research toward the design and synthesis for potential application in areas such as antibacterial activity, surface-enhanced Raman scattering (SERS)-based detection, and electrochemical sensing. The most recent developments deal with their antiviral applications [6]. Historically, Cu, Ag, and Au have been well-known for their oligodynamic efficacy, antiviral action as well as good biocompatibility, binding receptor inhibition, formation of reactive oxygen species, and phototherapy properties. Thus, a study was conducted to investigate the diagnostic and therapeutic mechanisms of the antivirus ability and mode of action of coinage metals on SARS-CoV-2. This article [6] also draws attention to coinage metal nanomaterial-based approaches to the treatment of other contagious viruses.
{"title":"Collective Plasmonic Resonances of Metallic Particle Clusters in Zeolite Materials","authors":"Mufei Xiao, Vitalii Petranovskii, Armando Reyes-Serrato, Joel Antúnez-García, Jesús L. A. Ponce-Ruiz, Constanza I. Koop-Santa, Fabian N. Murrieta-Rico, Rosario I. Yocupicio-Gaxiola, Jonathan Zamora-Mendieta, Nikifor Rakov","doi":"10.35702/catalres.10012","DOIUrl":"https://doi.org/10.35702/catalres.10012","url":null,"abstract":"INTRODUCTION Zeolites are crystalline microporous aluminosilicates that have found wide-ranging industrial applications in catalysis [1-3], as well as in other processes [4,5]. The main feature that fundamentally distinguishes them from other carriers is a system of voids strictly ordered in shape and size, which are an element of their crystalline structure. Catalysts are materials that allow important reactions to be more selective, faster, and require less energy. Coinage metals (copper, silver, and gold) possess noteworthy optical and electrical properties, are often found as important components in most catalysts, and are known for their high activity as well as many other important properties. Nanoclusters of these metals are widely used in biomedical imaging, remote sensing, labeling, etc. Coinage metal nanostructures possess noteworthy optical, and electrical properties, that are inspiring serious research toward the design and synthesis for potential application in areas such as antibacterial activity, surface-enhanced Raman scattering (SERS)-based detection, and electrochemical sensing. The most recent developments deal with their antiviral applications [6]. Historically, Cu, Ag, and Au have been well-known for their oligodynamic efficacy, antiviral action as well as good biocompatibility, binding receptor inhibition, formation of reactive oxygen species, and phototherapy properties. Thus, a study was conducted to investigate the diagnostic and therapeutic mechanisms of the antivirus ability and mode of action of coinage metals on SARS-CoV-2. This article [6] also draws attention to coinage metal nanomaterial-based approaches to the treatment of other contagious viruses.","PeriodicalId":178524,"journal":{"name":"Catalysis Research","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135140696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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