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学科主题: 物理化学
题名: Nanosize-Enhanced Lifetime of SAPO-34 Catalysts in Methanol-to-Olefin Reactions
作者: Yang, Guoju1, 2;  Wei, Yingxu1;  Xu, Shutao1;  Chen, Jingrun1;  Li, Jinzhe1;  Li, Zhongmin1;  Yu, Jihong2;  Xu, Ruren2
通讯作者: 刘中民 ;  Jihong Yu
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2013-04-25
DOI: 10.1021/jp312857p
卷: 117, 期:16, 页:8214-8222
收录类别: SCI
合作性质: 
文章类型: Article
部门归属: DNL12
项目归属: DNL1201
产权排名: 待补充
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
资助者: 1,1
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: In this work, we systematically investigated the size effect of silicoaluminophosphate molecular sieve catalysts SAPO-34 on the catalytic performance of methanol-to-olefin (MTO) reactions. Four highly crystalline SAPO-34 molecular sieves with different crystallite sizes were synthesized under hydrothermal conditions carried out in conventional or microwave ovens with the same starting gel composition using TEAOH as the structure-directing agent The as prepared SAPO-34s have similar composition, and their average crystal size can be controlled between 20 nrn and 8 mu m. Textural properties and chemical environments of framework atoms as well as acid concentration were characterized by N-2 adsorption and NMR measurements. The MTO reactions were carried out over these four SAPO-34 catalysts to study their catalytic performances dependent on the crystal size. The occurrence of catalyst deactivation varied considerably with the crystal size of SAPO-34s. Significantly, the nanosized catalysts, especially the sheetlike SAPO-34 catalyst with 20 nm thickness, exhibited the longest catalyst lifetime and lowest coking rate in MTO reactions On the basis of the measurement of coke formation and the determination of retained coke species, a scheme is proposed to elucidate the reduction in coke deposition and consequently the remarkably enhanced lifetime on the nanosized SAPO-34 catalysts in methanol conversion.
关键词[WOS]: MOLECULAR-SIEVES ;  REACTION-MECHANISM ;  HYDROCARBON FORMATION ;  SILICON INCORPORATION ;  NMR-SPECTROSCOPY ;  COKE FORMATION ;  LIGHT OLEFINS ;  MTO REACTION ;  CONVERSION ;  ZEOLITES
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000318211200032
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/119567
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, Natl Engn Lab Methanol Olefins, Dalian 116023, Peoples R China
2.Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China

Recommended Citation:
Yang, Guoju,Wei, Yingxu,Xu, Shutao,et al. Nanosize-Enhanced Lifetime of SAPO-34 Catalysts in Methanol-to-Olefin Reactions[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2013,117(16):8214-8222.
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