Chemical liquid deposition with polysiloxane of ZSM-5 and its effect on acidity and catalytic properties

	Chemical liquid deposition with polysiloxane of ZSM-5 and its effect on acidity and catalytic properties
	Zhu, Zhirong ; Xie, Zaiku ; Chen, Qingling ; Kong, Dejin ; Li, Wei ; Yang, Weimin ; Li, Can
刊名	microporous and mesoporous materials
	2007-04-19
卷号	101 期号:1-2 页码:169-175
关键词	ZSM-5 chemical liquid deposition polysiloxane acidity shape-selective catalysis
通讯作者	李灿
产权排序	1;1
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.
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
关键词[WOS]	toluene-methanol alkylation ; shape-selective reactions ; zeolite catalysts ; p-xylene ; generation ; mordenite ; h-zsm-5 ; surface ; disproportionation ; isomerization
收录类别	SCI ; ISTP
原文出处	true
语种	英语
WOS记录号	WOS:000246316200023
公开日期	2010-11-30
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/99707]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
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
推荐引用方式 GB/T 7714	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.
APA	Zhu, Zhirong.,Xie, Zaiku.,Chen, Qingling.,Kong, Dejin.,Li, Wei.,...&Li, Can.(2007).Chemical liquid deposition with polysiloxane of ZSM-5 and its effect on acidity and catalytic properties.microporous and mesoporous materials,101(1-2),169-175.
MLA	Zhu, Zhirong,et al."Chemical liquid deposition with polysiloxane of ZSM-5 and its effect on acidity and catalytic properties".microporous and mesoporous materials 101.1-2(2007):169-175.