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题名: Chemical liquid deposition with polysiloxane of ZSM-5 and its effect on acidity and catalytic properties
作者: Zhu, Zhirong;  Xie, Zaiku;  Chen, Qingling;  Kong, Dejin;  Li, Wei;  Yang, Weimin;  Li, Can
通讯作者: 李灿
关键词: ZSM-5 ;  chemical liquid deposition ;  polysiloxane ;  acidity ;  shape-selective catalysis
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2007-04-19
DOI: 10.1016/j.micromeso.2006.12.016
卷: 101, 期:1-2, 页:169-175
收录类别: SCI ;  ISTP
文章类型: Article
部门归属: 5
项目归属: 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: ZSM-5 acidity was modified by chemical liquid deposition of silica (SiO2-CLD), and the modification mechanism was investigated by pyrolysis gas chromatography-mass spectrometer (PGC-MS), absorbed pyridine infrared spectroscopy (Py-IR), temperature programmed desorption of ammonia (NH3-TPD), thermal gravity analysis (TGA), X-ray diffraction (XRD) and physical adsorption and probe-molecule reactions. In SiO2-CLD modification, the deposition process of polysiloxane modifier to silica over ZSM-5 is the acid-catalyzed degradation companying with the thermal pyrolysis, following oxidation at high temperature. Though the silanol hydroxyls of ZSM-5 disappear after the modification, most of the framework A] bridging hydroxyls and non-framework Al hydroxyls remain. Besides, the acidic amount of the modified ZSM-5 drops gradually with increasing extent of the modification, but the acidic strength distribution of the modified ZSM-5 is almost unchanged compared to parent ZSM-5. After the four-cycle modification, the conversion of 1,3,5-triisopropylbenzene (TIPB) in cracking over the modified ZSM-5 is reduced by 92%, so the external surface of the modified ZSM-5 may be regarded to be almost non-acidic due to coverage of deposition silica. Moreover, the modified ZSM-5 shows the high activity for cracking of cumene. High selectivity of para-xylene up to 96.2% is obtained in toluene disproportionation over the modified ZSM-5, compared to 24.3% selectivity of para-xylene over parent ZSM-5. Therefore, SiO2-CLD with polysiloxane is an ideal modification for obtaining the high shape-selective ZSM-5 catalyst. (c) 2006 Elsevier Inc. All rights reserved.
关键词[WOS]: TOLUENE-METHANOL ALKYLATION ;  SHAPE-SELECTIVE REACTIONS ;  ZEOLITE CATALYSTS ;  P-XYLENE ;  GENERATION ;  MORDENITE ;  H-ZSM-5 ;  SURFACE ;  DISPROPORTIONATION ;  ISOMERIZATION
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000246316200023
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99707
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, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.SINOPEC, Shanghai Res Inst Petrochem Technol, Shanghai 201208, Peoples R China

Recommended Citation:
Zhu, Zhirong,Xie, Zaiku,Chen, Qingling,et al. Chemical liquid deposition with polysiloxane of ZSM-5 and its effect on acidity and catalytic properties[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2007,101(1-2):169-175.
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