Microporous and Mesoporous Materials最新文献

An assessment of zeolite beta reactivity based on 27Al MAS NMR study of T-site distribution 基于27Al - MAS核磁共振t位分布研究的沸石反应性评价

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-17 DOI: 10.1016/j.micromeso.2025.113732

Ilya A. Kostyukov, Michael I. Petz, Ivan A. Kasyanov, Sofia A. Luhter, Olga A. Ponomareva, Irina I. Ivanova

{"title":"An assessment of zeolite beta reactivity based on 27Al MAS NMR study of T-site distribution","authors":"Ilya A. Kostyukov, Michael I. Petz, Ivan A. Kasyanov, Sofia A. Luhter, Olga A. Ponomareva, Irina I. Ivanova","doi":"10.1016/j.micromeso.2025.113732","DOIUrl":"10.1016/j.micromeso.2025.113732","url":null,"abstract":"<div><div>A series of model catalysts has been synthesized by hydrothermal crystallization in a fluoride medium by varying H<sub>2</sub>O/SiO<sub>2</sub> from 3.6 to 9.6 in the reaction gel. The zeolites obtained show similar structure, morphology and textural characteristics, but they are characterized by different distribution of Al atoms over T-sites and acidic properties: the higher the H<sub>2</sub>O/SiO<sub>2</sub> ratio, the more is the number of strong acid sites according to NH<sub>3</sub>-TPD data. In the <sup>27</sup>Al MAS NMR spectra of the synthesized samples, 4 signals of nonequivalent Al atoms with <em>δ</em><sub>iso</sub> = 54.3, 55.7, 58.6 and 59.8 ppm have been distinguished, which are assigned to T5 + T8 + T9, T1 + T2, T6 + T7 and T3 + T4 sites, respectively. In the series of model zeolites, intensity of the signals at 58.6 and 59.8 ppm increases with the H<sub>2</sub>O/SiO<sub>2</sub> ratio in the gel. Beta-7.6 and Beta-9.6 samples show higher catalytic activity in the toluene disproportionation reaction compared to Beta-3.6 and Beta-5.6, which coincides with the NH<sub>3</sub>-TPD data. A correlation between the initial rate of xylenes’ formation and the number of Al atoms corresponding to the signals at 58.6 ppm (T6 + T7 sites) and 59.8 ppm (T3 + T4 sites) in the <sup>27</sup>Al MAS NMR spectra has been established. In the course of crystallization T6 and T7 positions in zeolite framework tend to be the mostly occupied with an increase of the induction period by changing Si/Al or H<sub>2</sub>O/SiO<sub>2</sub> ratio in the reaction gel.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113732"},"PeriodicalIF":4.8,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322972","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

Natural and synthetic zeolites for water management in agriculture: A review 用于农业水管理的天然和合成沸石：综述

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-16 DOI: 10.1016/j.micromeso.2025.113731

Claudia Belviso

{"title":"Natural and synthetic zeolites for water management in agriculture: A review","authors":"Claudia Belviso","doi":"10.1016/j.micromeso.2025.113731","DOIUrl":"10.1016/j.micromeso.2025.113731","url":null,"abstract":"<div><div>Anthropogenic pressure and climate changes are causing dramatic depletion of the availability and quality of water resources. This has a significant effect on agricultural activities which uses more than two-thirds of the renewable water resources and must respond to the increasing demand for food. In this context, retaining water in agricultural soils without influencing crop yield allows for better management of this precious resource. With this aim, many literature data have documented the application of different additives to soil and among these, zeolites have always played a leading role due to their specific properties. This article summarizes studies concerning both natural and synthetic zeolite utilization in agriculture water management. The use of these materials is investigated in detail by referring to the numerous studies published worldwide over the last decades. Many investigations have been conducted on the effect of zeolites addition in conditioning physical properties in soil, and many others concern the action of these minerals in water management for plants. However, to our knowledge, no review article has been published yet that summarizes the literature on both these aspects and shows the contradictions that characterize many research results. It is precisely the analysis of these contradictions that provides guidance for the development of future lines of research. These should be based on large-scale experiments testing the effectiveness of zeolite addition in the soil-plant binary system for water management, mainly considering grain size and mineralogical composition of soils as well as percentage and size of zeolites. Zeolite framework plays a subordinate role as does the type of culture.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113731"},"PeriodicalIF":4.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322973","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

Mechanistic investigation of catalytic COS formation on ion-exchanged LTA zeolites during fixed-bed adsorption 离子交换LTA沸石固定床吸附过程中催化COS形成机理研究

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-11 DOI: 10.1016/j.micromeso.2025.113729

Sebastian Pfeifer , Christoph Pasel , Christian Bläker , Tobias Eckardt , Nele Klinkenberg , Jakob Eggebrecht , Kristin Gleichmann , Dieter Bathen

{"title":"Mechanistic investigation of catalytic COS formation on ion-exchanged LTA zeolites during fixed-bed adsorption","authors":"Sebastian Pfeifer , Christoph Pasel , Christian Bläker , Tobias Eckardt , Nele Klinkenberg , Jakob Eggebrecht , Kristin Gleichmann , Dieter Bathen","doi":"10.1016/j.micromeso.2025.113729","DOIUrl":"10.1016/j.micromeso.2025.113729","url":null,"abstract":"<div><div>In this study, the catalytic formation of COS from CO<sub>2</sub> and H<sub>2</sub>S during the adsorptive treatment of natural gas is investigated. Therefore, experiments with a model gas (CO<sub>2</sub>, H<sub>2</sub>S and H<sub>2</sub>O in N<sub>2</sub>) in a fixed bed were carried out. Breakthrough experiments were performed on five zeolites of the NaA and CaNaA type at 25 °C, 85 °C and 145 °C. From pre-loading experiments with the feed components, a mechanistic idea of multi-component adsorption in the fixed bed is derived in the form of generalized loading and concentration profiles. Furthermore, it is shown that at high excess of CO<sub>2</sub> in the feed the chemisorptive dissociation of H<sub>2</sub>S is rate-determining and a transition state for this step is proposed. The analysis of the COS breakthrough curves proves that the kinetics of the catalytic reaction is governed by temperature and the availability of physisorbed H<sub>2</sub>S at catalytically active sites. When sodium is exchanged for calcium, the number of catalytically active cations decreases. On the other hand, cations with double the charge number are introduced. In breakthrough experiments with materials of different exchange ratios, at 25 °C the influence of the type of cation dominates the catalytic activity of the zeolite, while at 85 °C and 145 °C the decreasing number of cations dominates the kinetics. Finally, the advancing front of the slowly migrating feed water stops the reaction. Migration velocity increases with temperature. At 85 °C, the fastest kinetics with the highest amount of COS is observed due to the already high reaction speed and the still slow water front. This article is a follow-up of previous article [1].</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113729"},"PeriodicalIF":4.8,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279307","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

Water intrusion-extrusion in 2-ethylimidazole/2-propylimidazole-doped ZIF-8: Influence of the substituent on imidazolate linker 2-乙基咪唑/2-丙基咪唑掺杂ZIF-8的水侵挤作用：取代基对咪唑连接剂的影响

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-10 DOI: 10.1016/j.micromeso.2025.113728

Yifan Wang , Hao Jiang , Yousheng Zhou , Peicheng Li , Qiyue Zhao , Chuanlei Liu , Qiumin Wu , Diyi Fang , Benxian Shen , Hui Sun

{"title":"Water intrusion-extrusion in 2-ethylimidazole/2-propylimidazole-doped ZIF-8: Influence of the substituent on imidazolate linker","authors":"Yifan Wang , Hao Jiang , Yousheng Zhou , Peicheng Li , Qiyue Zhao , Chuanlei Liu , Qiumin Wu , Diyi Fang , Benxian Shen , Hui Sun","doi":"10.1016/j.micromeso.2025.113728","DOIUrl":"10.1016/j.micromeso.2025.113728","url":null,"abstract":"<div><div>Controlling the intrusion and extrusion of non-wetting liquids in porous materials is fundamentally important for exploring the extensive applications of heterogeneous lyophobic systems (HLSs). Among various porous materials, metal-organic frameworks (MOFs) show promising potential for constructing HLSs due to their exceptional structural tunability. However, modulating their structures while maintaining both hydrophobicity and porosity remains a great challenge. In this work, a series of linker-doped zeolitic imidazolate frameworks (ZIFs) were synthesized by incorporating two additional linkers, 2-ethylimidazole and 2-propylimidazole, into ZIF-8. Synthesized samples were thoroughly characterized and subsequently employed to investigate water intrusion-extrusion within their structures. Combined characterizations confirm that these linker-doped ZIFs exhibit tunable pore sizes and hydrophobicity. Water intrusion-extrusion experiments reveal that the intrusion pressure of the HLSs involving ZIFs can be well-tuned within the range of 26–49 MPa. Cycling intrusion-extrusion tests confirm the enhanced stability of linker-doped ZIFs. In addition, molecular dynamics simulations suggest that bulkier and more hydrophobic substituents on secondary linkers spatially hinder the diffusion of water molecules and facilitate their outflow. This study provides an approach to tuning the mechanical properties of HLSs and offers insights into the rational design of MOFs for a variety of applications.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113728"},"PeriodicalIF":4.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279308","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

Insights into the mechanism of enhanced tetracycline adsorption performance using the amino functionalization copper(II)-based metal-organic frameworks 氨基功能化铜基金属有机骨架增强四环素吸附性能的机理研究

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-06 DOI: 10.1016/j.micromeso.2025.113727

Jia-Ting Chen, Hui Zhang, Si-Tong Chen, Wen-Bin Chen, Meng Yang, Yan-Yong Lin, Wen Dong

{"title":"Insights into the mechanism of enhanced tetracycline adsorption performance using the amino functionalization copper(II)-based metal-organic frameworks","authors":"Jia-Ting Chen, Hui Zhang, Si-Tong Chen, Wen-Bin Chen, Meng Yang, Yan-Yong Lin, Wen Dong","doi":"10.1016/j.micromeso.2025.113727","DOIUrl":"10.1016/j.micromeso.2025.113727","url":null,"abstract":"<div><div>Tetracycline (TC) accumulation in aquatic environments poses significant risks to human health and ecosystems. To address this challenge, we report the first synthesis of two novel copper (II)-based MOFs: {[NH<sub>2</sub>(CH<sub>3</sub>)<sub>2</sub>][Cu<sub>2</sub>O(Ad) (BDC)]·(H<sub>2</sub>O)<sub>2</sub>·(DMA)} (IISERP-MOF26) and its amino-functionalized derivative {[NH<sub>2</sub>(CH<sub>3</sub>)<sub>2</sub>][Cu<sub>2</sub>O(Ad) (NH<sub>2</sub>-BDC)]·(H<sub>2</sub>O)<sub>2</sub>·(DMA)} (NH<sub>2</sub>-IISERP-MOF26). Systematic characterization (SEM, FTIR, XRD, BET) confirmed the successful synthesis and enhanced surface properties of NH<sub>2</sub>-IISERP-MOF26. Remarkably, NH<sub>2</sub>-IISERP-MOF26 exhibited a 2.7-fold higher TC adsorption capacity (52.64 mg g<sup>−1</sup>) than its non-functionalized counterpart, surpassing many reported MOF-based adsorbents (e.g., MIL-101(Fe): 35.2 mg g<sup>−1</sup>; ZIF-8: 29.4 mg g<sup>−1</sup>; UIO-66: 23.1 mg g<sup>−1</sup>). Kinetic and isotherm studies revealed multilayer adsorption governed by hydrogen bonding, with amino groups acting as critical active sites. This work not only provides a simple strategy for tailoring MOFs via amino functionalization but also establishes a new paradigm for designing high-efficiency adsorbents to mitigate antibiotic pollution.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113727"},"PeriodicalIF":4.8,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240011","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

Porous polymer-modified metal–organic framework (AM@UIO-66-NH2) for electrochemical detection of dopamine in human serum 多孔聚合物修饰金属有机骨架（AM@UIO-66-NH2）电化学检测人血清中多巴胺

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-04 DOI: 10.1016/j.micromeso.2025.113726

Murugesan Chandran, Barkavi Dhanasekaran, Mekala Veerapandian, Saravanan Govindaraju, Kyusik Yun

{"title":"Porous polymer-modified metal–organic framework (AM@UIO-66-NH2) for electrochemical detection of dopamine in human serum","authors":"Murugesan Chandran, Barkavi Dhanasekaran, Mekala Veerapandian, Saravanan Govindaraju, Kyusik Yun","doi":"10.1016/j.micromeso.2025.113726","DOIUrl":"10.1016/j.micromeso.2025.113726","url":null,"abstract":"<div><div>Neurotransmitters (NTs) are essential for brain functions, cognition, and behavior as they transmit, amplify, and convert cellular signals, facilitating neuronal communication and regulating physiological processes. Dopamine (DA) acts both as an NTs and a hormone, contributing to reduced insulin production and decreased lymphocyte activity within the immune system. Metal–organic frameworks (MOFs), as emerging nanomaterials for biosensing, offer high porosity, large surface areas, facile functionalization, and tunable architectures. In this study, an amine-functionalized zirconium MOF was modified with synthetic allomelanin (AM) (AM@UIO-66-NH<sub>2</sub>) for highly efficient DA detection. The morphology, elemental composition, functional groups, crystalline phases, thermal stability, surface area, and electrochemical properties of the synthesized material were characterized via spectroscopic and analytical techniques. Square wave voltammetry (SWV) and chronoamperometry (CA) were employed to assess the DA detection limit (LOD). The optimized sensor demonstrated a linear DA detection range of 30–1000 nM, with LODs of 18 nM for SWV and 24 nM for CA. High-sensitivity detection of DA in human serum was achieved. In the presence of interferents, AM@UIO-66-NH<sub>2</sub> selectively oxidized DA and maintained its stability over 100 cycles. The developed composite shows great potential for DA detection in clinical diagnostics, demonstrating excellent sensitivity, reproducibility, and stability in serum samples.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113726"},"PeriodicalIF":4.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144231808","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

Naphthaleneimide functionalized NU-1000 as an efficient donor-acceptor photo-catalyst for the visible-light-driven oxidation of benzylamine coupling 萘酰亚胺功能化NU-1000作为一种高效的供-受体光催化剂用于可见光驱动氧化苄胺偶联反应

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-04 DOI: 10.1016/j.micromeso.2025.113724

Chunyu Liu, Mingxue Shao, Huadong Guo, Jiaping Cao, Rao Bao, Xianmin Guo

{"title":"Naphthaleneimide functionalized NU-1000 as an efficient donor-acceptor photo-catalyst for the visible-light-driven oxidation of benzylamine coupling","authors":"Chunyu Liu, Mingxue Shao, Huadong Guo, Jiaping Cao, Rao Bao, Xianmin Guo","doi":"10.1016/j.micromeso.2025.113724","DOIUrl":"10.1016/j.micromeso.2025.113724","url":null,"abstract":"<div><div>Metal-organic frameworks provided an advantageous platform for photo-catalysis owing to their designable structure and tunable photo-electric characteristic. However, the catalytic performance of MOFs often suffered from poor chem-stability, low visible light absorption and inefficient photogenerated charge separation. In this work, through the solvent-assisted ligand incorporation method, a carboxylate-derivatized naphthaleneimide moiety (HBNDI) was successfully integrated into pyrene-cored NU-1000 to establish a mixed-ligand BNDI-NU-1000. Photo-electric measurements and DFT calculations revealed that BNDI-NU-1000 was a typical donor-acceptor system owing to the rapid charge transfer between electron-rich pyrene and electron-deficient naphthaleneimide. Due to the synergetic effect of efficient photo-induced electron transfer and energy transfer, BNDI-NU-1000 displayed high catalytic activity in the visible-light-driven aerobic oxidation of benzylamine coupling. This study opened up a promising avenue to develop viable donor-acceptor photo-catalysts for organic transformation.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113724"},"PeriodicalIF":4.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144231974","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

Facile synthesis of hierarchical T-type zeolites with parallel-aligned rod-like nanocrystals 具有平行排列棒状纳米晶的分级t型沸石的简易合成

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-04 DOI: 10.1016/j.micromeso.2025.113708

Linzhe Li, Jianhua Yang, Hammad Saulat, Jinming Lu

{"title":"Facile synthesis of hierarchical T-type zeolites with parallel-aligned rod-like nanocrystals","authors":"Linzhe Li, Jianhua Yang, Hammad Saulat, Jinming Lu","doi":"10.1016/j.micromeso.2025.113708","DOIUrl":"10.1016/j.micromeso.2025.113708","url":null,"abstract":"<div><div>Hierarchical T-type zeolites (HT zeolites) with parallel-aligned rod-like nanocrystals (∼73 nm in width) were synthesized via a facile method simply by regulating the SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> molar ratio and crystallization kinetics. Selected area electron diffraction (SAED) analysis revealed that the crystallographic growth direction of the nanorods was along the <em>c</em>-axis while the short axis was along <em>a</em>- and <em>b</em>-directions. The optimized HT zeolites exhibited a framework Si/Al ratio of 2.74 and a high BET surface area (489.6 m<sup>2</sup>/g). The SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> molar ratio in the synthesis gel critically influenced zeolite structure, particle size, and morphology, inducing a competing CHA phase with a walnut-shaped morphology with lower ratio of 8. Highly crystalline HT zeolites were obtained at 373 K after 48 h, following an S-shaped crystallization curve, where rod-like nanocrystals grew in a parallel alignment while maintaining nearly constant widths. To investigate the nucleation and crystal growth behavior, Gualtieri model analysis and time trace experiments at different temperature were further conducted. The activation energies for nucleation and crystal growth, calculated from the Arrhenius relationship in the temperature range of 353–403 K, were found to be 43.0 ± 3.2 and 36.5 ± 1.7 kJ mol<sup>−1</sup> respectively, indicating nucleation was the rate-limiting step. The HT zeolites exhibited a CO<sub>2</sub> adsorption capacity of 4.01 mol/kg at 1 bar and 273 K, with CO<sub>2</sub>/N<sub>2</sub> initial and final adsorption ratios of 40.4 and 5.4, respectively. This work presents a simple and effective method for preparing hierarchical T zeolites, which can serve as a possible reference for the design of other hierarchical materials.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113708"},"PeriodicalIF":4.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144211977","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

Diffusion in nanoporous materials in the focus of an IUPAC Initiative: The innovative power of “Microscopic” measuring techniques 扩散在纳米多孔材料在IUPAC倡议的焦点：“微观”测量技术的创新力量

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-03 DOI: 10.1016/j.micromeso.2025.113725

Christian Chmelik , Roger Gläser , Jürgen Haase , Seungtaik Hwang , Jörg Kärger , Patricia Seidel

{"title":"Diffusion in nanoporous materials in the focus of an IUPAC Initiative: The innovative power of “Microscopic” measuring techniques","authors":"Christian Chmelik , Roger Gläser , Jürgen Haase , Seungtaik Hwang , Jörg Kärger , Patricia Seidel","doi":"10.1016/j.micromeso.2025.113725","DOIUrl":"10.1016/j.micromeso.2025.113725","url":null,"abstract":"<div><div>The diffusion of guest molecules in the interior of nanoporous materials is a phenomenon of great interest for both fundamental research and practical application. This concerns, in particular, the use of these materials for matter-upgrading by separation, purification and conversion, since the gain in value-added products can never be faster than allowed by the rate of mass transfer between the interior of such systems and their surroundings. In view of the complexity of these systems, the quantitation of diffusion in their interior is far from trivial and requires, as a rule, the introduction and consideration of a series of parameters. Measurement of these parameters often necessitates, in turn, a number of different measuring techniques. The present paper introduces into this multitude of parameters and the options of their measurement. It follows the classification as recently presented in an IUPAC Technical Report, dealing with the measurement of the determining parameters of diffusion in nanoporous materials. Particular attention is given to the so-called microscopic techniques and their distinguished role within the arsenal of measuring techniques.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113725"},"PeriodicalIF":4.8,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144231809","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

Preparation of Al-rich hierarchical zeolites by conventional alkali treatment: Defects as mesopore directing agents 常规碱处理制备富铝分级沸石：作为介孔导向剂的缺陷

IF 4.8 3区材料科学

Microporous and Mesoporous Materials Pub Date : 2025-06-02 DOI: 10.1016/j.micromeso.2025.113723

Xingyang Li, Dandan Zhang, Quanwei Zheng, Jiakui Chang, Xuan Liu, Renchun Yang, Meng Pan

{"title":"Preparation of Al-rich hierarchical zeolites by conventional alkali treatment: Defects as mesopore directing agents","authors":"Xingyang Li, Dandan Zhang, Quanwei Zheng, Jiakui Chang, Xuan Liu, Renchun Yang, Meng Pan","doi":"10.1016/j.micromeso.2025.113723","DOIUrl":"10.1016/j.micromeso.2025.113723","url":null,"abstract":"<div><div>In industry, it is highly desired to prepare Al-rich hierarchical zeolites by conventional alkali treatment without the use of costly chemical and special process. Here we provide an alternative strategy in which crystal defects are employed as mesopore directing agents. The effective elimination of the intracrystalline defects induces the generation of mesoporous structure in the alkali treatment process. Thus, the limitation originating from the framework Si/Al ratio of parent zeolite is circumvented. This strategy holds all merits of the conventional alkali treatment approach, which is industrially unfavorable. As an example, the Al-rich hierarchical ZSM-5 zeolites with very low Si/Al ratios were successfully prepared. The obtained Al-rich hierarchical zeolites were characterized by XRD, XRF, SEM, TEM, N<sub>2</sub> adsorption-desorption, in-situ IR, MAS NMR and NH<sub>3</sub>-TPD. The results showed that Si/Al ratios of the prepared hierarchical ZSM-5 zeolites were around 10 and the increases of external surface area and mesoporous volume were up to 2.6 and 3.7 times respectively in comparison with parent zeolite. Moreover, the constructed mesopores were interconnected open channels. In the catalytic cracking of 1,3,5-triisopropylbenzene, the Al-rich hierarchical ZSM-5 zeolites exhibited an excellent performance because of the improved diffusion of reactant and product.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"396 ","pages":"Article 113723"},"PeriodicalIF":4.8,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203776","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}

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