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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; Li C(李灿); Li C(李灿)
KeywordZsm-5 Chemical Liquid Deposition Polysiloxane Acidity Shape-selective Catalysis
Source PublicationMICROPOROUS AND MESOPOROUS MATERIALS
2007-04-19
DOI10.1016/j.micromeso.2006.12.016
Volume101Issue:1-2Pages:169-175
Indexed BySCI ; ISTP
SubtypeArticle
Department5
Funding Project503
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS KeywordTOLUENE-METHANOL ALKYLATION ; SHAPE-SELECTIVE REACTIONS ; ZEOLITE CATALYSTS ; P-XYLENE ; GENERATION ; MORDENITE ; H-ZSM-5 ; SURFACE ; DISPROPORTIONATION ; ISOMERIZATION
AbstractZSM-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.
Language英语
URL查看原文
WOS IDWOS:000246316200023
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/99707
Collection中国科学院大连化学物理研究所
Corresponding AuthorLi C(李灿); Li C(李灿)
Affiliation1.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
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.,...&李灿.(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.
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