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题名: Synthesis of mesoporous ZSM-5 catalysts using different mesogenous templates and their application in methanol conversion for enhanced catalyst lifespan
作者: Wang, Quanyi1, 5;  Xu, Shutao1, 2;  Chen, Jingrun1, 5;  Wei, Yingxu1;  Li, Jinzhe1;  Fan, Dong1, 5;  Yu, Zhengxi1;  Qi, Yue1;  He, Yanli1;  Xu, Shuliang1;  Yuan, Cuiyu1;  Zhou, You1, 5;  Wang, Jinbang1;  Zhang, Mozhi1, 5;  Su, Baolian2, 3;  Liu, Zhongmin1, 4
刊名: RSC ADVANCES
发表日期: 2014
DOI: 10.1039/c4ra02695k
卷: 4, 期:41, 页:21479-21491
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: In this work, two kinds of mesoporous ZSM-5 were synthesized successfully using a hydrothermal methodology by utilizing different soft templates, namely, dimethyl octadecyl [3-(trimethoxysilyl) propyl] ammonium chloride ([(CH3O)(3)SiC3H6N(CH3)(2)C18H37]Cl, TPOAC) and hexadecyl trimethyl ammonium bromide (C16H33(CH3)(3)NBr, CTAB). The obtained mesoporous ZSM-5 samples were compared with conventional ZSM-5, and the effects of different surfactant usages during the synthesis of mesoporous ZSM-5 on the physicochemical and catalytic properties were systematically investigated. Multiple techniques, such as XRD, SEM, N-2 adsorption techniques, HP Xe-129 NMR, Al-27 MAS NMR, Si-29 MAS NMR, and H-1 MAS NMR, were employed for the characterization. Although the synthesized mesoporous ZSM-5 samples had equal surface areas, they presented different relative crystallinities, morphologies, pore-size distributions, micropore-mesopore interconnectivity, framework atom coordination states and acidities. When using these synthesized ZSM-5 samples as catalysts for methanol conversion, the mesoporous ZSM-5 templated with TPOAC exhibited an extremely long catalyst lifespan compared to conventional ZSM-5, while mesoporous ZSM-5 templated with CTAB showed no advantage in prolonging the catalyst lifetime during the reaction. The differences in the catalytic lifespan and the reduction of coke deposition were correlated to the variation of acidity and porosity with the mesopore generation in the ZSM-5 catalysts by the usage of different structure-directing agents. Compared to the mesopore structure-directing agent, CTAB, with the use of TPOAC as the template and part of the Si source, mesoporous ZSM-5 could be synthesized with good mesopore-micropore interconnectivity, which accounted for the improved catalytic performance in the reaction of methanol conversion.
关键词[WOS]: HYPERPOLARIZED XE-129 NMR ;  ZEOLITE SINGLE-CRYSTALS ;  UNIT-CELL THICKNESS ;  MFI ZEOLITE ;  HIERARCHICAL ZEOLITES ;  MOLECULAR-SIEVES ;  POROUS MATERIALS ;  HZSM-5 ZEOLITE ;  DESILICATION ;  PERFORMANCE
语种: 英语
WOS记录号: WOS:000336837100041
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145610
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
2.Univ Namur FUNDP, Lab Inorgan Mat Chem CMI, B-5000 Namur, Belgium
3.Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
4.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Wang, Quanyi,Xu, Shutao,Chen, Jingrun,et al. Synthesis of mesoporous ZSM-5 catalysts using different mesogenous templates and their application in methanol conversion for enhanced catalyst lifespan[J]. RSC ADVANCES,2014,4(41):21479-21491.
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