Microporous and Mesoporous Materials最新文献_第5页

Mesoporous planar TS-1 supported molybdenum catalyst for green epoxidation of olefins: Synthesis, characterization and catalytic properties

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-20 DOI: 10.1016/j.micromeso.2025.113520

Beining Luo, Yan Wang, Yingqi Zhang, Caifeng Qiu, Guoqiang Yu, Liang Li, Xianzai Yan, Guoqiang Wu

{"title":"Mesoporous planar TS-1 supported molybdenum catalyst for green epoxidation of olefins: Synthesis, characterization and catalytic properties","authors":"Beining Luo, Yan Wang, Yingqi Zhang, Caifeng Qiu, Guoqiang Yu, Liang Li, Xianzai Yan, Guoqiang Wu","doi":"10.1016/j.micromeso.2025.113520","DOIUrl":"10.1016/j.micromeso.2025.113520","url":null,"abstract":"<div><div>Catalytic epoxidation limitations of conventional ellipsoid titanosilicate-1 (TS-1) remains owing to the narrow microporous channels and low efficiency of the Ti species. Herein, two-dimensional planer TS-1 zeolite (TS-1-P) was synthesized by adding crystal growth regulator in the hydrothermal synthesis process, and then TS-1-P supported molybdenum (Mo/TS-1-P) and mesoporous Mo/TS-1-P (Mo/MTS-1-P) were prepared and applied in epoxidation of olefins. The TS-1-P and the modified TS-1-P catalysts show a similar MFI framework and grain morphology but the different pore structure and coordination environment of Ti or Mo species. Especially, the Mo/MTS-1-P possesses many mesoporous pore and highly dispersed Mo species, which can improve the coordination environment of Ti species and weaken the Ti-O bond, the results are beneficial for the framework Ti species to combine more easily with H<sub>2</sub>O<sub>2</sub> to C=C band of the olefin molecules. Therefore, compared with TS-1-P, Mo/MTS-1-P exhibits the highest conversion of ACH (91.78 %) and 1-hexene (47.44 %) in the epoxidation of ACH and 1-hexene, respectively, the selectivity of epoxidized products simultaneous is above 96.42 % and 94.04 %, respectively. Moreover, the deactivation behavior of carbon deposit on the catalyst surface and regeneration method were also proposed. The successful preparation of Mo/MTS-1-P not only results in an efficient catalyst for epoxidation process but also provides a possible approach for surface and pore structure modification of TS-1 zeolite.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113520"},"PeriodicalIF":4.8,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Manipulating pore structures of SSZ-13 zeolite membranes via hydrocracking activation for superior H2/CO2 separation

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-20 DOI: 10.1016/j.micromeso.2025.113518

Weibo Chen , Feng Ye , Shuanshi Fan, Yanhong Wang, Xuemei Lang, Zijian Zhang, Gang Li

{"title":"Manipulating pore structures of SSZ-13 zeolite membranes via hydrocracking activation for superior H2/CO2 separation","authors":"Weibo Chen , Feng Ye , Shuanshi Fan, Yanhong Wang, Xuemei Lang, Zijian Zhang, Gang Li","doi":"10.1016/j.micromeso.2025.113518","DOIUrl":"10.1016/j.micromeso.2025.113518","url":null,"abstract":"<div><div>Manipulating pore structures with precisely controlled pore sizes and surface chemistry is essential for fabricating high-quality zeolite membranes. This study aims to improve the performance of SSZ-13 membranes by tuning their pore structures using an occluded organic structure-directing agent (OSDA) through low-temperature hydrocracking. The resulting membranes demonstrated notable improvements in H<sub>2</sub>/CO<sub>2</sub> separation. Permeation tests indicated that the SSZ-13 zeolite membrane achieved a moderate H<sub>2</sub> permeance of 1.04 × 10<sup>−7</sup> mol Pa<sup>−1</sup> m<sup>−2</sup> s<sup>−1</sup>, along with a markedly improved H<sub>2</sub>/CO<sub>2</sub> ideal selectivity of 225 at 150 °C. Both H<sub>2</sub> and CO<sub>2</sub> permeances increased significantly through the membrane with increasing temperatures, suggesting an activated diffusion mechanism for their permeation. The activation energy for H<sub>2</sub> permeation was calculated to be as high as 8.98 kJ mol<sup>−1</sup>, suggesting that the membrane has a relatively small mean pore size and minimal defects. CO<sub>2</sub> adsorption and temperature-programmed desorption (TPD) analysis showed a pronounced interaction between CO<sub>2</sub> molecules and the SSZ-13 membrane, likely accounting for the exceptionally low CO<sub>2</sub> permeance observed. These SSZ-13 zeolite membranes demonstrate considerable potential for efficient H<sub>2</sub>/CO<sub>2</sub> separation in practical applications.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113518"},"PeriodicalIF":4.8,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface chemical modulation of nitrogen-doped microporous carbon for efficient removal of H2S and CO2: The effect of nitrogen functionality

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-20 DOI: 10.1016/j.micromeso.2025.113517

Yongping Ma , Yan Xu , Fan Liu , Yankai Zhang , Jitong Wang

{"title":"Surface chemical modulation of nitrogen-doped microporous carbon for efficient removal of H2S and CO2: The effect of nitrogen functionality","authors":"Yongping Ma , Yan Xu , Fan Liu , Yankai Zhang , Jitong Wang","doi":"10.1016/j.micromeso.2025.113517","DOIUrl":"10.1016/j.micromeso.2025.113517","url":null,"abstract":"<div><div>The removal of hydrogen sulfide (H₂S) and carbon dioxide (CO₂) is of paramount importance for mitigating environmental pollution. However, due to the difficulty in accurately controlling the surface chemistry, the performance of carbon materials in the simultaneous removal of H₂S and CO₂ remains relatively limited. Herein, nitrogen-doped microporous carbon with well-developed pore structure was prepared through a combination of hydrothermal synthesis and molten salt method. The impact of nitrogen-doped surface chemistry on the removal performance for H₂S and CO₂ at room temperature was primarily studied. Owing to its abundant micropores and ultramicropores, the material possesses sufficient basic sites that can effectively remove CO₂. Pyrrolic nitrogen serves as the primary basic site during CO₂ adsorption, which exhibits an excellent CO₂ adsorption capacity of 136.97 mg CO₂/g. The high nitrogen content provides a strongly alkaline environment conducive to the dissociation of H₂S on the carbon surface, with pyrrolic nitrogen being the main basic site during the catalytic oxidation of H₂S. The large pore volume offers sufficient storage space for desulfurization products, enabling a sulfur capacity of 2.56 g H₂S/g. DFT calculations reveal that pyrrolic nitrogen undergoes the largest change in charge before and after the adsorption of CO₂ and H₂S, due to its strong adsorption effect on both gases. In the presence of both CO₂ and H₂S, competition for active sites leads to a decline in the removal performance for both gases. This work holds significant implications for the design of materials for the simultaneous removal of CO₂ and H₂S.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113517"},"PeriodicalIF":4.8,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shedding electrons on ADOR zeolite structures – Structure determination by 3DED

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-18 DOI: 10.1016/j.micromeso.2025.113514

Anna Laštovičková, Daniel N. Rainer, Michal Mazur

{"title":"Shedding electrons on ADOR zeolite structures – Structure determination by 3DED","authors":"Anna Laštovičková, Daniel N. Rainer, Michal Mazur","doi":"10.1016/j.micromeso.2025.113514","DOIUrl":"10.1016/j.micromeso.2025.113514","url":null,"abstract":"<div><div>Three-dimensional electron diffraction (3DED) offers a powerful alternative to single-crystal X-ray diffraction (SCXRD) for the structure determination of crystalline materials with small-sized crystals (usually nanometre-sized) or crystals with intergrowths, often produced during zeolite synthesis. ADOR is a synthesis strategy of novel daughter zeolites from well-known parent germanosilicates. Structure determination of such ADOR zeolites is challenging due to the presence of aggregated intergrowths, and often small-sized crystals. This work demonstrates the application of continuous rotation electron diffraction (cRED), a type of 3DED, for the rapid structural characterisation of zeolites produced by ADOR approach. cRED can be performed in a transmission electron microscope and the structure of a studied material can be obtained rapidly. We propose a unified workflow for the structure determination of ADOR daughter materials. This workflow involves the initial structural investigation and determination of the parent material, followed by the utilization of this knowledge to facilitate the subsequent structure determination of the daughter material. Investigation strategy was shown to be uniform, as presented for ADOR transformation of two different parent germanosilicates. This approach is a tool allowing prompt recognition of new ADOR zeolites at the early stage of their synthesis and can be used for a feedback-based optimisation of synthesis conditions.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113514"},"PeriodicalIF":4.8,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The support affects the catalytic conversion in thymol hydrogenation reaction

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-17 DOI: 10.1016/j.micromeso.2025.113507

Fateme Poorsharbaf Ghavi , Martin Kubů , Oleg Petrov , Monika Remzová , Subhajyoti Samanta , Jan Přech , Maksym Opanasenko

{"title":"The support affects the catalytic conversion in thymol hydrogenation reaction","authors":"Fateme Poorsharbaf Ghavi , Martin Kubů , Oleg Petrov , Monika Remzová , Subhajyoti Samanta , Jan Přech , Maksym Opanasenko","doi":"10.1016/j.micromeso.2025.113507","DOIUrl":"10.1016/j.micromeso.2025.113507","url":null,"abstract":"<div><div>Hydrogenation of the aromatic ring in phenolic compounds is an important reaction in industry and in the synthesis of fine chemicals. Pd-supported catalysts have proved to be highly active and efficient in deep hydrogenation of aromatic ring. Previous studies confirmed that the acidity and topology properties of the support play an important role in the efficient transformation of the phenolic reactant. In this study, we have investigated the effect of these two parameters by designing advanced layered MFI and MWW zeolites. To understand the effect of acidity, we compared the catalytic performance of a series of Pd/MFI catalysts that significantly differed in the acidity of the support. Then, we compared the catalytic results from Pd on aluminosilicate MFI and Pd/MCM-56 to see the effect of the support's topology. Thymol was used as a model phenolic reactant, and the results confirmed that not only the Pd on non-acidic MFI support was inactive (conversions below 25 %), but also the acidity of the MFI support led to higher thymol conversion (47 %), while more weak acid centers and silanol groups in dealuminated MFI topped up the outcome (100 % conversion). Data also showed that between two aluminosilicate supports, the MWW outperformed MFI (100 % vs. 47 %), due to its topology and morphology for better accommodating thymol and interacting with it.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113507"},"PeriodicalIF":4.8,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143162780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tailoring catalyst support with bicontinuous concentric lamellar morphology for dry reforming of methane

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-17 DOI: 10.1016/j.micromeso.2025.113511

Dian H. Wahyudi , Aishah A. Jalil , Muhammad A. Aziz , Abdul H. Hatta , Mohd H.M. Sofi , Nadiatus Silmi , Hermania E. Wogo , Nurul S. Hassan , Veinardi Suendo , Rino R. Mukti , Ismunandar

{"title":"Tailoring catalyst support with bicontinuous concentric lamellar morphology for dry reforming of methane","authors":"Dian H. Wahyudi , Aishah A. Jalil , Muhammad A. Aziz , Abdul H. Hatta , Mohd H.M. Sofi , Nadiatus Silmi , Hermania E. Wogo , Nurul S. Hassan , Veinardi Suendo , Rino R. Mukti , Ismunandar","doi":"10.1016/j.micromeso.2025.113511","DOIUrl":"10.1016/j.micromeso.2025.113511","url":null,"abstract":"<div><div>Since the utilization of greenhouse gases has been an important topic for the last decade, a great effort has been made to find a way to ameliorate this utilization. Dry reforming of methane (DRM) has gained much attention due to its ability to decrease greenhouse gas emissions and generate valuable syngas. In this study, unique material with bicontinuous concentric lamellar (<em>bcl</em>) morphology has been synthesized and employed as catalyst support for DRM reaction. Ni/<em>bcl</em>-Silica and Ni/<em>bcl</em>-AAs catalysts with <em>bcl</em> morphology were successfully synthesized and characterized using XRD, SEM, TEM, FTIR, N<sub>2</sub> adsorption, and CO<sub>2</sub>-TPD analysis. In the DRM reaction, the Ni/<em>bcl</em>-AAs catalyst demonstrated significantly better performance, achieving 90 % CH<sub>4</sub> selectivity and 77 % CO<sub>2</sub> conversion, compared to Ni/<em>bcl</em>-Silica. This superior performance is attributed to the <em>bcl</em> morphology, which provides a high surface area and improved accessibility of reactants to the active metal sites, thereby enhancing catalytic efficiency. Moreover, the presence of Al content in Ni/<em>bcl</em>-AAs composition can enhance the basicity of the Ni/<em>bcl</em>-AAs catalyst. The synergistic effect between the high surface area and basic sites resulted in a good performance in DRM reaction.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113511"},"PeriodicalIF":4.8,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insight into the role of meso-Y zeolites in CsPMo/meso-Y composites on the selective oxidation of sulfides enhancement

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-16 DOI: 10.1016/j.micromeso.2025.113508

Chang Sun , Yutong Han , Yingzhen Wei , Zhong Zhang , Xiaohui Li , Guocheng Liu , Xiuli Wang

{"title":"Insight into the role of meso-Y zeolites in CsPMo/meso-Y composites on the selective oxidation of sulfides enhancement","authors":"Chang Sun , Yutong Han , Yingzhen Wei , Zhong Zhang , Xiaohui Li , Guocheng Liu , Xiuli Wang","doi":"10.1016/j.micromeso.2025.113508","DOIUrl":"10.1016/j.micromeso.2025.113508","url":null,"abstract":"<div><div>Polyoxometalates (POMs), renowned for their excellent catalytic activity, are widely used in oxidation reactions. Rational regulation of metal ion valence state of POMs is of great significance for the design and construction of highly active catalyst. In this work, we utilized mesoporous Y zeolite (meso-Y) as a host to load and disperse cesium phosphomolybdate (CsPMo) for selective oxidation of thioethers. The as-prepared CsPMo/meso-Y featured superior catalytic activity and recyclability. The electronic structures of the CsPMo/meso-Y were investigated by XPS and NMR spectra. The results indicated that embedding CsPMo into meso-Y caused electron transfer from CsPMo to meso-Y. Meanwhile, meso-Y could provide H<sup>+</sup> due to its abundant Brønsted acid sites. The simultaneous appearance of electron and H<sup>+</sup> facilitated the formation of Mo<sup>V</sup>, resulting in a higher oxidation of thioethers activity for the CsPMo/meso-Y. Radical scavenger experiments and Raman analysis indicated that peroxo-metal species derived from CsPMo and oxidizing agent tert-butyl hydroperoxide (TBHP) were the real catalyst. Mo<sup>V</sup> is more conducive to the formation of peroxo-metal species, causing the higher activity. This study provides a new insight into the role of meso-Y in CsPMo/meso-Y and a novel clue to regulate the valence states of metal ions of POMs to enhance catalytic performance of the polyoxometalate based catalysts.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113508"},"PeriodicalIF":4.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Boosting the water absorption of CAU-10: The role of hydrochloric acid in regulating defect concentration

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-16 DOI: 10.1016/j.micromeso.2025.113510

Xiaoli Han , Ping Wu , Guodong Fu , Shiping Zhang , Li Wang , Min Xu , Xiulan Huai

{"title":"Boosting the water absorption of CAU-10: The role of hydrochloric acid in regulating defect concentration","authors":"Xiaoli Han , Ping Wu , Guodong Fu , Shiping Zhang , Li Wang , Min Xu , Xiulan Huai","doi":"10.1016/j.micromeso.2025.113510","DOIUrl":"10.1016/j.micromeso.2025.113510","url":null,"abstract":"<div><div>CAU-10-H is a promising water adsorbent for adsorption heat transformation systems due to its excellent hydrothermal stability and favorable \"S\" type isothermal adsorption characteristic. However, its water uptake capacity is relatively low. In this work, the hydrochloric acid modulation defect structure of CAU-10 is rationally developed to get the CAU-10-HCl-2 sample, which possesses high water absorption capacity and outstanding cycle stability. The concentrations of metal atom defects and ligand defects in CAU-10-HCl-2 are 5.8 % and 3.0 %, respectively, which are 29 times and 0.375 times those of the CAU-10 sample without hydrochloric acid addition. This indicates that hydrochloric acid modulation facilitates the production of metal atom defects while suppressing the emergence of ligand defects. The specific surface area, micropore volume, and total pore volume of CAU-10-HCl-2 are 526.6 m<sup>2</sup>/g, 0.20 ml/g, and 0.23 ml/g, respectively, up 17 %, 25 %, and 10 % from CAU-10. At a relative pressure P/P<sub>0</sub> of 0.2, the water uptake of CAU-10-HCl-2 reaches up to 0.29 g/g, which is a 14 % increase compared to CAU-10. Compared to the initial hydration, the water uptake of CAU-10 decreases by 16 % by the 30th cycle, while that of CAU-10-HCl-2 lowers by only 2 %. These results demonstrate that hydrochloric acid modulation is an efficient strategy to improve the water absorption capacity and cyclic stability of CAU-10. This study provides quantitative analysis and synthesis instructions for designing defect structures in CAU-10 via hydrochloric acid modulation.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113510"},"PeriodicalIF":4.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143162782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrocracking of polyethylene to high quality liquid fuels over bimetallic catalyst PdAg/HZSM-5

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-16 DOI: 10.1016/j.micromeso.2025.113512

Jie Liu , Xia Zhong , Li Gao , Ying Zhang , Ziru Wang , Mozaffar Shakeri , Xia Zhang , Bingsen Zhang

{"title":"Hydrocracking of polyethylene to high quality liquid fuels over bimetallic catalyst PdAg/HZSM-5","authors":"Jie Liu , Xia Zhong , Li Gao , Ying Zhang , Ziru Wang , Mozaffar Shakeri , Xia Zhang , Bingsen Zhang","doi":"10.1016/j.micromeso.2025.113512","DOIUrl":"10.1016/j.micromeso.2025.113512","url":null,"abstract":"<div><div>It is well known that the rapid accumulation of plastics poses a serious environmental pollution problem due to their difficulty in naturally decomposition. Hydrocracking provides an opportunity to convert plastics into value-added chemicals. Herein, the zeolite HZSM-5 supported metal bifunctional catalysts were synthesized for the hydrocracking of polyethylene to obtain high quality liquid hydrocarbon products. Benefiting from the strategy of bimetallic alloying, the second metal was designed to rationally regulate the structure of the active component within the catalyst in order to facilitate the conversion of polyolefin plastics into liquid hydrocarbons. It is found that the introduction of the second metal Ag could affect the electron density on Pd surface, which induced better dispersion of the metal particles. In addition, the metal-zeolite interactions as well as intermetallic interactions between these two metals can modulate the electronic state of Pd, thus improving the selectivity of the target products. The optimum Pd<sub>0.5</sub>Ag<sub>1.5</sub>/HZSM-5 catalyst was found to exhibit the best catalytic performance by tuning the Pd and Ag loading, with the liquid hydrocarbon yield of 69.18 %. The present work provides a reference for the design and synthesis of catalysts to improve the yield of high-value liquid fuels.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113512"},"PeriodicalIF":4.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tunable acidity and porosity for optimizing liquid-phase catalytic efficiency utilizing hierarchical zeolite ZSM-5 single crystal reactor

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-01-15 DOI: 10.1016/j.micromeso.2025.113509

Zhan Liu , Jia-Min Lyu , Chun-Mu Guo , Zhi-Yi Hu , Ming-Hui Sun , Li-Hua Chen , Bao-Lian Su

{"title":"Tunable acidity and porosity for optimizing liquid-phase catalytic efficiency utilizing hierarchical zeolite ZSM-5 single crystal reactor","authors":"Zhan Liu , Jia-Min Lyu , Chun-Mu Guo , Zhi-Yi Hu , Ming-Hui Sun , Li-Hua Chen , Bao-Lian Su","doi":"10.1016/j.micromeso.2025.113509","DOIUrl":"10.1016/j.micromeso.2025.113509","url":null,"abstract":"<div><div>Hierarchically porous zeolites, combining the intrinsic microporous catalytic properties and the enhanced meso-/macroporous access and transport, exhibit excellent performances in many highly efficient catalytic processes. The acidity and porosity are two key factors affecting the catalytic conversion, selectivity and lifetime. It is necessary to construct such hierarchically porous zeolite catalysts with adjustable acid active sites and pore properties in a wide range to meet the specific catalytic requirements. Herein, an ordered interconnected hierarchical ZSM-5 single crystal catalyst composed by zeolite sphere units stacking in face-centered cubic (FCC) arrangement has been used as the theoretical model to research the corresponding material properties on the enhancement of specific catalytic process. Specifically, the properties of acid sites and meso-/macropores can be accurately adjusted by facilely changing the SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> molar ratio (100–1000) and the sphere unit size (180–580 nm), respectively. As a result, the benzyl alcohol liquid-phase catalytic ability markedly improved thanks to the optimized acidity and meso-/macropore size. The larger meso-/macropore size shows higher benzyl alcohol conversion, while the higher SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> molar ratio exhibits higher alkylation product selectivity. This work illustrate that the targeted catalytic process can be effectively enhanced by adjusting the acidity and porosity within such ordered hierarchical ZSM-5 single crystal system.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"387 ","pages":"Article 113509"},"PeriodicalIF":4.8,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143162778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0