Pub Date : 2025-11-11DOI: 10.1016/j.apt.2025.105102
Ruichao Yang , Zhifang Li , Jinxing Cui , Yuanyuan Ma , Changlong Yang
The elimination of nitrogen oxides has become a focal point in the field of the control of air pollution. A series of MnCeOx/C catalysts are synthesized using in-situ pyrolysis under N2 atmosphere using bimetallic Mn/Ce-MOF as the precursor. The effects of different Mn/Ce molar ratios on the structure, physicochemical properties and NH3-SCR performance are investigated. The results show that the Mn3Ce1Ox/C catalyst displays excellent low-temperature activity (NOx conversion is more than 90 %) at 175–275 ℃. This is attributed to the large specific surface area of the Mn3Ce1Ox/C, while the addition of Ce promotes the formation of oxygen vacancies through the Mn3++Ce4+↔ Ce3+ + Mn4+ redox cycle, which further facilitates the oxidation of NO to NO2, resulting in the formation of a “fast SCR” reaction. Meanwhile, the Mn3Ce1Ox/C catalyst has prominent tolerance to H2O and SO2, which is attributed to the sacrificial site Ce to protect the active component Mn as well as the hydrophobicity of the MOF-derived carbon material. This work provides a novel approach for designing high-performance low-temperature SCR catalysts.
{"title":"Modulating the low-temperature NH3-SCR activity of bimetallic MOF-derived MnCeOx/C catalyst via the molar ratio of manganese and cerium","authors":"Ruichao Yang , Zhifang Li , Jinxing Cui , Yuanyuan Ma , Changlong Yang","doi":"10.1016/j.apt.2025.105102","DOIUrl":"10.1016/j.apt.2025.105102","url":null,"abstract":"<div><div>The elimination of nitrogen oxides has become a focal point in the field of the control of air pollution. A series of MnCeO<sub>x</sub>/C catalysts are synthesized using in-situ pyrolysis under N<sub>2</sub> atmosphere using bimetallic Mn/Ce-MOF as the precursor. The effects of different Mn/Ce molar ratios on the structure, physicochemical properties and NH<sub>3</sub>-SCR performance are investigated. The results show that the Mn3Ce1O<sub>x</sub>/C catalyst displays excellent low-temperature activity (NO<sub>x</sub> conversion is more than 90 %) at 175–275 ℃. This is attributed to the large specific surface area of the Mn3Ce1O<sub>x</sub>/C, while the addition of Ce promotes the formation of oxygen vacancies through the Mn<sup>3+</sup>+Ce<sup>4+</sup>↔ Ce<sup>3+</sup> + Mn<sup>4+</sup> redox cycle, which further facilitates the oxidation of NO to NO<sub>2</sub>, resulting in the formation of a “fast SCR” reaction. Meanwhile, the Mn3Ce1O<sub>x</sub>/C catalyst has prominent tolerance to H<sub>2</sub>O and SO<sub>2</sub>, which is attributed to the sacrificial site Ce to protect the active component Mn as well as the hydrophobicity of the MOF-derived carbon material. This work provides a novel approach for designing high-performance low-temperature SCR catalysts.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105102"},"PeriodicalIF":4.2,"publicationDate":"2025-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145517791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-11DOI: 10.1016/j.apt.2025.105111
Peng Wang , Shaochen Yang , Wencai Wang , Zhao Cao , Xuping Li , Yongdan Cao , Zhoukang Wu , Dawei Wang
Understanding the effects of different slope profiles on the spontaneous combustion of coal gangue hills is crucial for effective prevention and control. Unlike previous studies that primarily focused on temperature variations, this study developed a multiphysics coupling model integrating seepage velocity, oxygen concentration, and temperature fields to investigate the internal evolution of multiple fields during the spontaneous combustion process. Based on thermodynamic experiments, a zoning method was proposed using characteristic temperature points to delineate spontaneous combustion risk zones within coal gangue hills. The spatial distribution and formation mechanisms of combustion-prone areas were analyzed across hills with different slope profiles. The results show that when the coal gangue temperature reaches the T2 point (336.82 °C), the material enters an accelerated oxidation stage, significantly increasing the risk of spontaneous combustion. Multiphysics simulation revealed that high-risk zones are primarily located in the mid-upper slope areas, with risk severity ranked as follows: arc-shaped > planar > corner > arched slopes. Additionally, under oblique wind conditions, the overall combustion risk for all slope types was reduced. The study found that the spontaneous combustion risk of coal gangue hills increases with stacking time at a decelerating rate, while the minimum safe accumulation rate exhibits exponential growth as stacking duration extends.
{"title":"Multi-physical field coupling analysis of the spontaneous combustion process in coal gangue hills influenced by slope profiles","authors":"Peng Wang , Shaochen Yang , Wencai Wang , Zhao Cao , Xuping Li , Yongdan Cao , Zhoukang Wu , Dawei Wang","doi":"10.1016/j.apt.2025.105111","DOIUrl":"10.1016/j.apt.2025.105111","url":null,"abstract":"<div><div>Understanding the effects of different slope profiles on the spontaneous combustion of coal gangue hills is crucial for effective prevention and control. Unlike previous studies that primarily focused on temperature variations, this study developed a multiphysics coupling model integrating seepage velocity, oxygen concentration, and temperature fields to investigate the internal evolution of multiple fields during the spontaneous combustion process. Based on thermodynamic experiments, a zoning method was proposed using characteristic temperature points to delineate spontaneous combustion risk zones within coal gangue hills. The spatial distribution and formation mechanisms of combustion-prone areas were analyzed across hills with different slope profiles. The results show that when the coal gangue temperature reaches the T<sub>2</sub> point (336.82 °C), the material enters an accelerated oxidation stage, significantly increasing the risk of spontaneous combustion. Multiphysics simulation revealed that high-risk zones are primarily located in the mid-upper slope areas, with risk severity ranked as follows: arc-shaped > planar > corner > arched slopes. Additionally, under oblique wind conditions, the overall combustion risk for all slope types was reduced. The study found that the spontaneous combustion risk of coal gangue hills increases with stacking time at a decelerating rate, while the minimum safe accumulation rate exhibits exponential growth as stacking duration extends.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105111"},"PeriodicalIF":4.2,"publicationDate":"2025-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145517790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-10DOI: 10.1016/j.apt.2025.105099
Andrey M. Abyzov , Fedor M. Shakhov , Maria V. Tomkovich , Maxim M. Sychev
Pyrocarbon coatings were applied to coarse-grained (particle size of about 250 μm) diamond and silicon carbide powders by chemical vapor deposition (CVD). The substrate particles were smooth-faced and isometric for diamond, whereas for silicon carbide they were elongated and had irregular shape. According to scanning electron microscopy (SEM) and Raman spectroscopy, the coatings obtained are typical of pyrocarbon. The BET specific adsorption surface area sam and the electrical resistance R of the powders in the packed bed were measured, as well as the coating density ρc. All the obtained data on the coating properties and structure are presented as dependences on the mass-average coating thickness h calculated from the coating mass and the specific geometric surface area sgm of the substrate powder. The sgm value was determined using the average particle size and the shape coefficient (sphericity). This made it possible to identify the differences between nanometer and submicron coatings (h ≤ 0.1 μm or h > 0.1 μm) and to relate the observed features of the ρc(h), sam (h), and R−1(h) dependences to the coating microstructure (roughness, continuity, etc.). The diagrams h(τ), where τ is the deposition time, enabled us to compare the pyrocarbon growth rate on diamond and on silicon carbide.
{"title":"Pyrocarbon coatings of nanometer and submicron thickness on coarse diamond and silicon carbide powders differing in particle shape","authors":"Andrey M. Abyzov , Fedor M. Shakhov , Maria V. Tomkovich , Maxim M. Sychev","doi":"10.1016/j.apt.2025.105099","DOIUrl":"10.1016/j.apt.2025.105099","url":null,"abstract":"<div><div>Pyrocarbon coatings were applied to coarse-grained (particle size of about 250 μm) diamond and silicon carbide powders by chemical vapor deposition (CVD). The substrate particles were smooth-faced and isometric for diamond, whereas for silicon carbide they were elongated and had irregular shape. According to scanning electron microscopy (SEM) and Raman spectroscopy, the coatings obtained are typical of pyrocarbon. The BET specific adsorption surface area <em>s</em><sup>a</sup><sub>m</sub> and the electrical resistance <em>R</em> of the powders in the packed bed were measured, as well as the coating density <em>ρ</em><sub>c</sub>. All the obtained data on the coating properties and structure are presented as dependences on the mass-average coating thickness <em>h</em> calculated from the coating mass and the specific geometric surface area <em>s</em><sup>g</sup><sub>m</sub> of the substrate powder. The <em>s</em><sup>g</sup><sub>m</sub> value was determined using the average particle size and the shape coefficient (sphericity). This made it possible to identify the differences between nanometer and submicron coatings (<em>h</em> ≤ 0.1 μm or <em>h</em> > 0.1 μm) and to relate the observed features of the <em>ρ</em><sub>c</sub>(<em>h</em>), <em>s</em><sup>a</sup><sub>m</sub> (<em>h</em>), and <em>R</em><sup>−1</sup>(<em>h</em>) dependences to the coating microstructure (roughness, continuity, etc.). The diagrams <em>h</em>(<em>τ</em>), where <em>τ</em> is the deposition time, enabled us to compare the pyrocarbon growth rate on diamond and on silicon carbide.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105099"},"PeriodicalIF":4.2,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145517782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-08DOI: 10.1016/j.apt.2025.105100
Yahong Wang , Lixin Zhao , Lin Liu , Dianyu E , Kaiwen Yang , Shuang Zhang , Muze Wang
Mini-hydrocyclones (MHCs) are widely used for efficient fine particle separation. However, their separation efficiency can fluctuate significantly with changes in their geometry, operating conditions, or the separated medium. Current evaluation methods rely heavily on numerical simulations and experiments, which increases complexity and costs, limiting their practical use. This study developed a back-propagation neural network (BPNN) model integrating MHC geometrical parameters, operational parameters, and media physical properties to predict separation efficiency. Combined with response surface methodology (RSM), the optimal BPNN configuration was determined: 13 and 11 neurons in the first and second hidden layers, respectively, with a learning rate of 5.27E-3. The number of neurons in the first hidden layer was found to have the most significant effect on the model accuracy, followed by the learning rate. The optimized model’s mean square errors (MSEs) on the training and testing datasets are only 7.11E-4 and 8.98E-4, which are significantly lower than those in the original BPNN model. And the model was validated using new experimental data from other literature, demonstrating its high generalization ability to new data. Further, the superiority of the optimized BPNN model was verified by comparing the accuracy of existing prediction models. This study can provide a high-precision prediction method for the multiphase separation of MHCs under different operating conditions, which can help to improve the application efficiency of MHCs.
{"title":"Highly accurate prediction of mini-hydrocyclone separation efficiency by coupling back propagation neural network and response surface method","authors":"Yahong Wang , Lixin Zhao , Lin Liu , Dianyu E , Kaiwen Yang , Shuang Zhang , Muze Wang","doi":"10.1016/j.apt.2025.105100","DOIUrl":"10.1016/j.apt.2025.105100","url":null,"abstract":"<div><div>Mini-hydrocyclones (MHCs) are widely used for efficient fine particle separation. However, their separation efficiency can fluctuate significantly with changes in their geometry, operating conditions, or the separated medium. Current evaluation methods rely heavily on numerical simulations and experiments, which increases complexity and costs, limiting their practical use. This study developed a back-propagation neural network (BPNN) model integrating MHC geometrical parameters, operational parameters, and media physical properties to predict separation efficiency. Combined with response surface methodology (RSM), the optimal BPNN configuration was determined: 13 and 11 neurons in the first and second hidden layers, respectively, with a learning rate of 5.27E-3. The number of neurons in the first hidden layer was found to have the most significant effect on the model accuracy, followed by the learning rate. The optimized model’s mean square errors (MSEs) on the training and testing datasets are only 7.11E-4 and 8.98E-4, which are significantly lower than those in the original BPNN model. And the model was validated using new experimental data from other literature, demonstrating its high generalization ability to new data. Further, the superiority of the optimized BPNN model was verified by comparing the accuracy of existing prediction models. This study can provide a high-precision prediction method for the multiphase separation of MHCs under different operating conditions, which can help to improve the application efficiency of MHCs.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105100"},"PeriodicalIF":4.2,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145463955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-07DOI: 10.1016/j.apt.2025.105080
Zhan Luo, Xinxin Tang, Zhouzun Xie, Yansong Shen
Despite the broad applications in the chemical engineering fields, the spouting behavior of chip-like particles in the spouted beds is still limited from the experimental scope. In the current study, the minimum spouting velocity, spout instability including spout incoherence and spout deflection, and particle mixing are investigated based on the Particle Image Velocimetry (PIV) measurement. Two kinds of particles (chip-like and spherical) are adopted in this work and the effect of spouting gas velocity and static bed height on the spouting behavior is discussed. The spout incoherence and spout deflection are post-processed with two simple quantitative methods, respectively. The results show that the minimum spouting velocity both for spherical and chip-like particles increases with the increase of the static bed height. The particle velocity distribution (x- or y-direction) is affected significantly by the particle shape, gas spouting velocity and static bed height. For spout incoherence, the blockage height almost linearly increases in a period for both spherical and chip-like particles under different case settings. Finally, three main mixing zones are classified in the dense bottom region, spouting mixing zone, downward movement mixing zone and unmixing/dead zones. The current work is beneficial to the further investigation of chip-like particles in the spouted beds.
{"title":"Experimental investigation of the hydrodynamics of chip-like particles in a flat-base spouted bed","authors":"Zhan Luo, Xinxin Tang, Zhouzun Xie, Yansong Shen","doi":"10.1016/j.apt.2025.105080","DOIUrl":"10.1016/j.apt.2025.105080","url":null,"abstract":"<div><div>Despite the broad applications in the chemical engineering fields, the spouting behavior of chip-like particles in the spouted beds is still limited from the experimental scope. In the current study, the minimum spouting velocity, spout instability including spout incoherence and spout deflection, and particle mixing are investigated based on the Particle Image Velocimetry (PIV) measurement. Two kinds of particles (chip-like and spherical) are adopted in this work and the effect of spouting gas velocity and static bed height on the spouting behavior is discussed. The spout incoherence and spout deflection are post-processed with two simple quantitative methods, respectively. The results show that the minimum spouting velocity both for spherical and chip-like particles increases with the increase of the static bed height. The particle velocity distribution (x- or y-direction) is affected significantly by the particle shape, gas spouting velocity and static bed height. For spout incoherence, the blockage height almost linearly increases in a period for both spherical and chip-like particles under different case settings. Finally, three main mixing zones are classified in the dense bottom region, spouting mixing zone, downward movement mixing zone and unmixing/dead zones. The current work is beneficial to the further investigation of chip-like particles in the spouted beds.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105080"},"PeriodicalIF":4.2,"publicationDate":"2025-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145463956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-07DOI: 10.1016/j.apt.2025.105093
Adhi Setiawan, Sugeng Winardi, W. Widiyastuti
Rhodamine B (RB) is a synthetic dye commonly used in the textile industry, but its presence poses risks to health and the environment. Mitigating water pollution caused by synthetic dyes necessitates effective wastewater treatment methods. Therefore, this study aims to develop a simple, cost-effective, and environmentally friendly approach to synthesizing adsorbents by combining polyvinyl alcohol (PVA) and corn cob (CC)-based activated carbon (AC) through an electrospinning process to form PVA/AC composite fibers. The results showed that the increase in AC content in the composite fiber led to an enhancement in the adsorption performance against RB. PVA/AC composite fiber containing 10 % AC had a maximum adsorption capacity 5.41 times higher than PVA fiber and got a maximum 96.02 % RB removal efficiency. Adsorption isotherm analysis demonstrated compliance with the Langmuir model. Kinetic studies show that the pseudo-first-order (PFO) model best explains the adsorption process. Thermodynamic analysis also indicated that the adsorption was spontaneous and exothermic (ΔH° = −57.23 kJ/mol). Based on reusability tests, the adsorbent maintained a high removal efficiency, with RB removal decreasing marginally from 96.35 % to 78.93 % after five cycles. These results underscore the potential of PVA/AC composite fiber as an effective adsorbent for addressing water pollution caused by synthetic dyes.
{"title":"Composite fiber of polyvinyl alcohol/activated carbon from corn cob prepared by electrospinning as a sustainable adsorbent for efficient rhodamine B adsorption","authors":"Adhi Setiawan, Sugeng Winardi, W. Widiyastuti","doi":"10.1016/j.apt.2025.105093","DOIUrl":"10.1016/j.apt.2025.105093","url":null,"abstract":"<div><div>Rhodamine B (RB) is a synthetic dye commonly used in the textile industry, but its presence poses risks to health and the environment. Mitigating water pollution caused by synthetic dyes necessitates effective wastewater treatment methods. Therefore, this study aims to develop a simple, cost-effective, and environmentally friendly approach to synthesizing adsorbents by combining polyvinyl alcohol (PVA) and corn cob (CC)-based activated carbon (AC) through an electrospinning process to form PVA/AC composite fibers. The results showed that the increase in AC content in the composite fiber led to an enhancement in the adsorption performance against RB. PVA/AC composite fiber containing 10 % AC had a maximum adsorption capacity 5.41 times higher than PVA fiber and got a maximum 96.02 % RB removal efficiency. Adsorption isotherm analysis demonstrated compliance with the Langmuir model. Kinetic studies show that the pseudo-first-order (PFO) model best explains the adsorption process. Thermodynamic analysis also indicated that the adsorption was spontaneous and exothermic (ΔH° = −57.23 kJ/mol). Based on reusability tests, the adsorbent maintained a high removal efficiency, with RB removal decreasing marginally from 96.35 % to 78.93 % after five cycles. These results underscore the potential of PVA/AC composite fiber as an effective adsorbent for addressing water pollution caused by synthetic dyes.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105093"},"PeriodicalIF":4.2,"publicationDate":"2025-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145464002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gas-solid spouted beds are widely used in fields such as biomass combustion due to their excellent heat transfer performance and gas–solid mixing efficiency. The size, shape, and density of biomass particles play a crucial role in the two-phase flow and combustion kinetics processes. However, existing research has primarily focused on spherical biomass particles, and the fluidization mechanisms of non-spherical particle systems has not yet been fully understood. Therefore, studying the fluidization characteristics of non-spherical particle systems is of great significance for advancing fluidization theory and optimizing the design of spouted bed reactors. This study employs the computational fluid dynamics (CFD) and discrete element method (DEM) framework to investigate the fluidization characteristics of ellipsoidal particles and validates the reliability of the numerical model through high-speed photography experiments. The results indicate that as the inlet gas velocity increases, the average bed height and void fraction of ellipsoidal particles in the spouted bed gradually increase, and the particle mixing quality is enhanced. As the initial accumulation height increases, the average bed height and volume fraction of ellipsoidal particles gradually increase, while the overall particle mixing quality decreases. Particles with orientation angles between 30° and 45°constitute a smaller proportion, whereas those with orientation angles between 75° and 90° constitute a larger proportion.
{"title":"CFD-DEM modeling and simulation of ellipsoidal particles in a gas–solid spouted bed","authors":"Ling Zhou , Haihan Yu , Zhenjiang Zhao , Daramy Kallon , Ramesh Agarwal , Jie Chen","doi":"10.1016/j.apt.2025.105095","DOIUrl":"10.1016/j.apt.2025.105095","url":null,"abstract":"<div><div>Gas-solid spouted beds are widely used in fields such as biomass combustion due to their excellent heat transfer performance and gas–solid mixing efficiency. The size, shape, and density of biomass particles play a crucial role in the two-phase flow and combustion kinetics processes. However, existing research has primarily focused on spherical biomass particles, and the fluidization mechanisms of non-spherical particle systems has not yet been fully understood. Therefore, studying the fluidization characteristics of non-spherical particle systems is of great significance for advancing fluidization theory and optimizing the design of spouted bed reactors. This study employs the computational fluid dynamics (CFD) and discrete element method (DEM) framework to investigate the fluidization characteristics of ellipsoidal particles and validates the reliability of the numerical model through high-speed photography experiments. The results indicate that as the inlet gas velocity increases, the average bed height and void fraction of ellipsoidal particles in the spouted bed gradually increase, and the particle mixing quality is enhanced. As the initial accumulation height increases, the average bed height and volume fraction of ellipsoidal particles gradually increase, while the overall particle mixing quality decreases. Particles with orientation angles between 30° and 45°constitute a smaller proportion, whereas those with orientation angles between 75° and 90° constitute a larger proportion.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105095"},"PeriodicalIF":4.2,"publicationDate":"2025-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145463957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-04DOI: 10.1016/j.apt.2025.105094
Yanqing Guo , Jiaying Lu , Luming Chen , Jie Yang , Xiaogang Yang , Yihang Xin
An Eulerian Computational Fluid Dynamics modelling coupled with the use of Lagrangian Discrete Phase Model (CFD/DPM) was employed to investigate the effect of meso/micro multiple-scale turbulent mixing on the synthesis process of micro/nano oxide particles in a continuous multistage Rankine vortex flow. The changes from micro- to macro-scale interactions among different scales, including the coupling of particle entrainment by turbulent eddies and synthesis reaction in the Rankine vortex flow and the mesoscale structure (i.e., particle aggregates and reactor scales) were systematically studied, especially focusing on the influence of meso/micro scale turbulent eddies on the synthesized micro/nano particles. It has been demonstrated that the use of Eulerian-Lagrangian framework (CFD/DPM) can effectively capture the simultaneous interactions between aggregated particles and turbulent eddies, enabling the evaluation of how operational variations, specifically in the eddy size based Reynolds number and reactant concentration, to affect the final particle properties. Numerical results for a range of these conditions have shown a strong agreement with the experimental data. The present study has demonstrated that the multistage Rankine vortex flow can effectively intensify the local turbulence induced shear at meso/micro scales, thereby controlling nanoparticle aggregation and breakage to facilitate the production of uniform, meso-sized particles with well-defined morphology.
{"title":"Effect of meso/micro multiple scale turbulent shear mixing on the synthesis process of micro/nano oxide particles in continuous multistage Rankine vortex flow","authors":"Yanqing Guo , Jiaying Lu , Luming Chen , Jie Yang , Xiaogang Yang , Yihang Xin","doi":"10.1016/j.apt.2025.105094","DOIUrl":"10.1016/j.apt.2025.105094","url":null,"abstract":"<div><div>An Eulerian Computational Fluid Dynamics modelling coupled with the use of Lagrangian Discrete Phase Model (CFD/DPM) was employed to investigate the effect of meso/micro multiple-scale turbulent mixing on the synthesis process of micro/nano oxide particles in a continuous multistage Rankine vortex flow. The changes from micro- to macro-scale interactions among different scales, including the coupling of particle entrainment by turbulent eddies and synthesis reaction in the Rankine vortex flow and the mesoscale structure (i.e., particle aggregates and reactor scales) were systematically studied, especially focusing on the influence of meso/micro scale turbulent eddies on the synthesized micro/nano particles. It has been demonstrated that the use of Eulerian-Lagrangian framework (CFD/DPM) can effectively capture the simultaneous interactions between aggregated particles and turbulent eddies, enabling the evaluation of how operational variations, specifically in the eddy size based Reynolds number and reactant concentration, to affect the final particle properties. Numerical results for a range of these conditions have shown a strong agreement with the experimental data. The present study has demonstrated that the multistage Rankine vortex flow can effectively intensify the local turbulence induced shear at meso/micro scales, thereby controlling nanoparticle aggregation and breakage to facilitate the production of uniform, <em>meso</em>-sized particles with well-defined morphology.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105094"},"PeriodicalIF":4.2,"publicationDate":"2025-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145463942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-03DOI: 10.1016/j.apt.2025.105098
Camila Ottonelli Calgaro , Mirian Dosolina Fuzinatto , Shayla Santos Lopes , Taliana Tronco , Diego Gil de los Santos , Daniel Assumpção Bertuol , Pedro José Sanches Filho
Rice husk ash is an industrial residue composed essentially of silica that can be used as an alternative source of silica for the synthesis of ZSM-5 zeolite. This study aimed to obtain ZSM-5 zeolite without organic structure-directing agents, evaluating the use of silica extracted from industrial rice husks using an ultrasonic bath. The effect of ultrasound was also evaluated in the aging stage of the zeolite. The catalytic potential of the synthesized zeolite was measured in the pyrolysis of rice husks. XRF, XRD, BET, and SEM-EDS characterization were performed on the synthesized zeolites. It was possible to obtain the ZSM-5 zeolite under all the synthesis conditions studied. Still, the silica extraction method and the aging method were decisive for the formation of the crystalline phase and the surface area of the synthesized zeolite. The use of silica extracted with an ultrasonic bath promoted the most crystalline ZSM-5 phase in the samples and the highest surface areas. The ZU3 zeolite had the highest BET surface area of 277.5 m2/g, which was attributed to the use of ultrasound. The application of ZU3 zeolite increased the gas phase production in rice husk pyrolysis to 45 % due to its action in cracking reactions.
{"title":"Evaluation of the use of silica extracted from industrial waste with an ultrasonic bath and modifications to the aging stage in the synthesis of ZSM-5 and its application in pyrolysis","authors":"Camila Ottonelli Calgaro , Mirian Dosolina Fuzinatto , Shayla Santos Lopes , Taliana Tronco , Diego Gil de los Santos , Daniel Assumpção Bertuol , Pedro José Sanches Filho","doi":"10.1016/j.apt.2025.105098","DOIUrl":"10.1016/j.apt.2025.105098","url":null,"abstract":"<div><div>Rice husk ash is an industrial residue composed essentially of silica that can be used as an alternative source of silica for the synthesis of ZSM-5 zeolite. This study aimed to obtain ZSM-5 zeolite without organic structure-directing agents, evaluating the use of silica extracted from industrial rice husks using an ultrasonic bath. The effect of ultrasound was also evaluated in the aging stage of the zeolite. The catalytic potential of the synthesized zeolite was measured in the pyrolysis of rice husks. XRF, XRD, BET, and SEM-EDS characterization were performed on the synthesized zeolites. It was possible to obtain the ZSM-5 zeolite under all the synthesis conditions studied. Still, the silica extraction method and the aging method were decisive for the formation of the crystalline phase and the surface area of the synthesized zeolite. The use of silica extracted with an ultrasonic bath promoted the most crystalline ZSM-5 phase in the samples and the highest surface areas. The ZU3 zeolite had the highest BET surface area of 277.5 m<sup>2</sup>/g, which was attributed to the use of ultrasound. The application of ZU3 zeolite increased the gas phase production in rice husk pyrolysis to 45 % due to its action in cracking reactions.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105098"},"PeriodicalIF":4.2,"publicationDate":"2025-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145463943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01DOI: 10.1016/j.apt.2025.105079
Kunanon Jongchansitto , Xavier Balandraud , Benoit Blaysat , Michel Grédiac , Thomas Jailin , Jean-Benoit Le Cam , Pawarut Jongchansitto , Itthichai Preechawuttipong
The paper proposes a new experimental technique to measure interparticle contact forces in two-dimensional (2D) granular media comprising opaque particles. The technique used to identify the forces is the Virtual Fields Method (VFM), which uses the weak form of the local equilibrium equation. The high-resolution strain fields required for identification are measured within the particles using Localized Spectrum Analysis (LSA), based on a checkerboard marking previously engraved on each particle. Applications are performed on systems composed of one hundred cylindrical particles in polyamide 66 (PA66) under quasi-static confined compression. The paper first describes the methodology to properly identify the contact forces. Next, the focus is on the statistical distributions of normal and tangential forces in monodisperse, bidisperse and tridisperse systems. Weak and strong force networks in bidisperse and tridisperse systems follow power law and exponential decay, respectively. The maximum tangential-to-normal force ratio approximates the coefficient of friction, with few exceptions. Contact force redistributions during macroscopic displacement are highlighted in tridisperse system, revealing rapid changes in forces exerted on the vertical walls. Based on various validations, including comparisons with discrete element method simulations, the study demonstrates the feasibility of VFM and LSA for measuring interparticle contact forces in 2D granular systems.
{"title":"Measurement of interparticle forces in two-dimensional granular systems using the Virtual Fields Method and Localized Spectrum Analysis","authors":"Kunanon Jongchansitto , Xavier Balandraud , Benoit Blaysat , Michel Grédiac , Thomas Jailin , Jean-Benoit Le Cam , Pawarut Jongchansitto , Itthichai Preechawuttipong","doi":"10.1016/j.apt.2025.105079","DOIUrl":"10.1016/j.apt.2025.105079","url":null,"abstract":"<div><div>The paper proposes a new experimental technique to measure interparticle contact forces in two-dimensional (2D) granular media comprising opaque particles. The technique used to identify the forces is the Virtual Fields Method (VFM), which uses the weak form of the local equilibrium equation. The high-resolution strain fields required for identification are measured within the particles using Localized Spectrum Analysis (LSA), based on a checkerboard marking previously engraved on each particle. Applications are performed on systems composed of one hundred cylindrical particles in polyamide 66 (PA66) under quasi-static confined compression. The paper first describes the methodology to properly identify the contact forces. Next, the focus is on the statistical distributions of normal and tangential forces in monodisperse, bidisperse and tridisperse systems. Weak and strong force networks in bidisperse and tridisperse systems follow power law and exponential decay, respectively. The maximum tangential-to-normal force ratio approximates the coefficient of friction, with few exceptions. Contact force redistributions during macroscopic displacement are highlighted in tridisperse system, revealing rapid changes in forces exerted on the vertical walls. Based on various validations, including comparisons with discrete element method simulations, the study demonstrates the feasibility of VFM and LSA for measuring interparticle contact forces in 2D granular systems.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 11","pages":"Article 105079"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145424755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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