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Templates for the synthesis of zeolites

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Chinese Journal of Structural Chemistry 2024年第4期43卷 48-58页

作者： Huimin Luan qinming wu Jianping wu Xiangju Meng Feng-Shou Xiao College of Chemical and Biological Engineering Zhejiang UniversityHangzhou310027China Kente Catalysts Inc. Fengxi West RoadModern Industrial ClusterXianju CountyZhejiang317300China Key Laboratory of Applied Chemistry of Zhejiang Province Department of ChemistryZhejiang UniversityHangzhou310007China

Though zeolites have been successfully synthesized for several decades,the roles of templates for zeolite synthesis are still not fully understood ***,many types of templates have been employed such as inorganic alkali metal ions,organic quaternary ammonium cations,organic amines,organic quaternary phosphonium cations,metal complexes and zeolite seeds,and the roles are mainly summarized into three aspects:structure-directing,space-filling and *** order to synthesize zeolites efficiently,the proposed principles to guide zeolite synthesis are the stabilization of energy between templates and zeolite framework,charge density mis-matching(CDM)and structure matching between zeolite frameworks and *** purpose of this review is to briefly summarize the progresses in recent years,clearly showing the roles of the templates for zeolite synthesis.

关键词： Zeolites Templates Zeolite synthesis Zeolite structure

New zeolites with extra-stable extra-large-pore

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Chinese Journal of Structural Chemistry 2024年第6期43卷 3-3页

作者： qinming wu Xiangju Meng College of Chemical and Biological Engineering Zhejiang UniversityHangzhou310007China Department of Chemistry Zhejiang UniversityHangzhou310007China

Zeolites with intricate micropore from 8-membered rings(8-MRs)to 12-MRs have been widely employed in ion-exchange,adsorption,separation and catalysis[1].However,they are sometimes limited in demand due to their relatively small micropore in the practical *** of the solutions is to synthesize extra-large-pore zeolites(>12-MRs)with the multidimensional *** the past decades,great progress has been made to synthesize extra-large-pore zeolites,such as-CLO,-ITV,-SSO,-SFH and-IFU[2].However,the above reported zeolites are interrupted and/or ***,it is highly desirable to synthesize extra-large-pore zeolites with the multidimensional system.

关键词： zeolites synthesize membered

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建筑工程造价估算系统设计

移动信息 2024年第4期46卷 325-327页

作者：吴琴明甘肃陇昌源建设工程有限公司甘肃白银730900

建筑工程造价估算系统设计作为工程项目管理的重要环节,具有深远的意义和重要性。其不仅涉及到工程项目的投资决策、资金筹措、成本控制等多个方面,更是保障项目顺利进行,实现经济效益和社会效益最大化的关键。文中对建筑工程造价估算... 详细信息

建筑工程造价估算系统设计作为工程项目管理的重要环节,具有深远的意义和重要性。其不仅涉及到工程项目的投资决策、资金筹措、成本控制等多个方面,更是保障项目顺利进行,实现经济效益和社会效益最大化的关键。文中对建筑工程造价估算系统的设计目标进行了阐述,分析了系统的整体架构以及各模块功能,为建筑工程造价领域的发展提供了参考。

关键词：建筑工程工程造价系统设计

Targeted synthesis of zeolites from calculated interaction between zeolite structure and organic template

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National Science Review 2022年第9期9卷 67-78页

作者： qinming wu Huimin Luan Feng-Shou Xiao Key Lab of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Key Lab of Applied Chemistry of Zhejiang Province Department of Chemistry Zhejiang University

Zeolites,a class of silica-based porous materials,have been widely employed in the chemical industry for uses such as sorption,separation,catalysis and ion ***,the synthesis of zeolites is performed in the presence of organic templates via a trial-and-error route,which is labor-intensive and *** recent years,theoretical simulation from the interaction between a zeolite structure and an organic template has been used to guide the synthesis of zeolites,which is *** this review,recent progress in the targeted synthesis of zeolites from interaction between a zeolite structure and an organic template are briefly outlined including the design of new templates for zeolite synthesis,preparation of zeolites with new composition,development of novel routes for zeolite synthesis,synthesis of intergrowth zeolites,generation of novel zeolite structures,control of zeolite morphology and modulation of aluminum distribution in *** targeted syntheses reveal that the minimum energy principle from the theoretical simulation is key for guiding zeolite *** review will be important for zeolite researchers for rationally synthesizing zeolites and effectively designing new zeolite structures.

关键词： zeolite organic template targeted synthesis interaction energy theoretical simulation

Theoretical design for zeolite synthesis

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Science China Chemistry 2022年第9期65卷 1683-1690页

作者： qinming wu Huimin Luan Feng-Shou Xiao Key Lab of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Key Lab of Applied Chemistry of Zhejiang Province Department of ChemistryZhejiang UniversityHangzhou 31007China

Zeolites,an important class of microporous crystals,have been widely utilized in the fields of catalysis,ion-exchange,separation,and sorption for a long *** general,zeolites are synthesized in the presence of costly organic templates under hydrothermal conditions by trial-and-error method,which is not only environmentally unfriendly but also *** recent years,novel concepts of design for zeolite synthesis,which are sustainable,cheap,simple,and efficient,have been *** this review,the recent advances in design for zeolite synthesis will be briefly summarized,mainly including the design of organic templates for directing the formation of zeolites,design of organotemplate-free route for zeolite synthesis,design of solvent-free strategy for zeolite synthesis,design for novel interzeolite transformation,and targeted control of zeolite *** review might be helpful for developing sustainable routes for targeted synthesis of zeolites in the future.

关键词： zeolite organic template organotemplate-free solvent-free interzeolite transformation morphology control

Solvent-free synthesis of zeolite catalysts

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Science China Chemistry 2015年第1期58卷 6-13页

作者： Xiangju Meng qinming wu Fang Chen Feng-Shou Xiao Key Lab of Applied Chemistry of Zhejiang Province Department of Chemistry Zhejiang University

The most used method for preparation of zeolites is hydrothermal synthesis from silicate or aluminosilicate gels at temperatures in the range of 60-200 ℃. Excess water used in the industrial process results in several issues, including high autogeneous pressure, low efficiency, pollution, etc. To solve these problems, several strategies have been developed. This review describes the solvent-free synthesis of zeolites. The combination of solvent-free synthesis and organotemplate-free synthesis can open the pathway to a highly sustainable zeolite synthesis protocol in industry.

关键词： zeolites solvent-free sustainable

Insights into the Organotemplate-Free Synthesis of Zeolite Catalysts

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Engineering 2017年第4期3卷 567-574页

作者： Yeqing Wang qinming wu Xiangju Meng Feng-Shou Xiao Key Lab of Applied Chemistry of Zhejiang Province Department of Chemistry Zhejiang University Hangzhou 310007 China

As the most important nanoporous material, zeolites, which have intricate micropores, are essential heterogeneous catalysts in industrial processes. Zeolites are generally synthesized with organic templates under hydrothermal conditions; however, this method is environmentally unfriendly and costly due to the formation of harmful gases and polluted water. This article briefly summarizes the role of organic templates and describes designed routes for the organotemplate-free synthesis of zeolites, aided by zeolite seeds and zeolite seeds solution. Furthermore, this review explicates that the micmpore volume decreases with an increase of the Si/Al ratios in the organotemplate-free synthesis of zeolite products, where Na^＋ exists as an alkali cation. This feature is very important in directing the synthesis of zeolite catalysts with controllable Si/AI ratios under organotemplate-free conditions, and is thus important for the efficient design of zeolites.

关键词： Zeolite seed-directed synthesis Organotemplate-free synthesis Zeolite seeds solution Si/Al ratiosZeolite micropore volume

Sustainable Synthesis of Core-Shell Structured ZSM-5@Silicalite-1 Zeolite

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Chemical Research in Chinese Universities 2022年第1期38卷 136-140页

作者： LUAN Huimin wu qinming ZHANG Jian WANG Yeqing MENG Xiangju XIAO Feng-Shou Key Laboratory of Applied Chemistry of Zhejiang Province Zhejiang UniversityHangzhou 310028P.R.China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310027P.R.China Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029P.R.China

Core-shell structured ZSM-5@Silicalite-1 zeolite could effectively hinder the deactivation of catalyst surface. Currently, organic structure directing agents(OSDAs) are necessary in the conventional route for the synthesis of this core-shell zeolite under hydrothermal conditions, which is costly and environmental-unfriendly. In this research, a synthesis of the core-shell structured ZSM-5@Silicalite-1 zeolite with a strategy of alcohol filling and zeolite seeding without any organic template or solvent is exhibited. The obtained products are well characterized by X-ray powder diffractometer(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), N2 sorption isotherms, solid magic angle spinning(MAS) NMR, temperature-programmed-desorption of ammonia(NH3-TPD), and X-ray photoelectron spectroscopy(XPS) techniques, in order to confirm the core-shell structure. More importantly, the core-shell structured ZSM-5@Silicalite-1 zeolite exhibits a long lifetime and a high p-xylene selectivity in the alkylation of toluene with methanol, compared with the conventional ZSM-5 catalyst.

关键词： MFI zeolite Core-shell structure Sustainable synthesis Alkylation of toluene with methanol

Organosilane surfactant-assisted synthesis of mesoporous SSZ-39 zeolite with enhanced catalytic performance in the methanol-to-olefins reaction

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Frontiers of Chemical Science and Engineering 2020年第2期14卷 267-274页

作者： Hao Xu Chi Lei qinming wu Qiuyan Zhu Xiangju Meng Daniel Dai Stefan Maurer Andrei-Nicolae Parvulescu Ulrich Muller Fengshou Xiao Key Laboratory of Applied Chemistry of Zhejiang Province Department of ChemistryZhejiang UniversityHangzhou 310028China BASF Catalysts(Shanghai)Co. Ltd.Shanghai 201206China BASF SE Ludwigshafen 67056Germany

SSZ-39 zeolite with AEI framework structure is a good catalyst candidate for the methanol-to-olefins(MTO)***,the diffusion limitation and coke formation often results in fast deactivation of the SSZ-39 zeolite *** solution for this challenge is to introduce mesoporosity in the SSZ-39 ***,we report the synthesis of mesoporous SSZ-39 zeolite using an organosilane surfactant,,-dimethyl--(3-(trimethoxysilyl)propyl)octan-1-aminium chloride,as a mesopore template and,-dimethyl--2,6-dimethylpiperidinium as a micropore *** obtained zeolites were characterized by X-ray diffraction,N sorption,scanning electron microscopy,temperature programmed desorption of ammonia,and magic angle spinning nuclear magnetic resonance of *** results show that the mesoporous SSZ-39 zeolite has high crystallinity,meso/microporosity,high surface area,cuboid morphology,and abundant acidic *** importantly,this mesoporous SSZ-39 zeolite exhibits enhanced catalyst lifetime in the MTO reaction due to the presence of mesoporosity for fast mass transfer,compared with a conventional SSZ-39 zeolite without mesoporosity.

关键词： SSZ-39 zeolite mesopores organosilane surfactant MTO reaction soft template mass transfer