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题名: On the acid-dealumination of USY zeolite: a solid state NMR investigation
作者: Yan, ZM;  Ding, MA;  Zhuang, JQ;  Liu, XC;  Liu, XM;  Han, XW;  Bao, XH;  Chang, FX;  Xu, L;  Liu, ZM
关键词: Y zeolite ;  dealummation ;  solid-state NMR ;  MQ MAS NMR ;  acidity ;  cracking
刊名: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
发表日期: 2003-03-03
卷: 194, 期:1-2, 页:153-167
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The dealumination of USY (ultrastable Y) zeolites by nitric acid and oxalic acid treatment was systematically investigated by multinuclear solid-state NMR and MQ MAS NMR experiments. The results show that both acids are very effective in removing non-framework Al as well as framework Al but that aluminum is extracted from the lattice at a higher rate by oxalic acid even at low concentrations. The presence of different species (e.g. silanol nest, Al-OH, four-coordinated framework Al, six-coordinated framework Al, six-coordinated non-framework Al and five-coordinated non-framework Al) was detected, and their changes were followed during the dealumination. The investigation gives evidence that the breakdown of the parent USY zeolite mainly depends on the degree of dealumination and that non-framework Al exerts a great effect on the acidity of the USY zeolite. Leaching-induced increase in the Bronsted acidity of the USY zeolite was also observed by H-1 MAS NMR spectroscopy. The different distribution of Al species in these samples accounted for the different catalytic performance of n-dodecane cracking. (C) 2002 Published by Elsevier Science B.V.
关键词[WOS]: ANGLE-SPINNING NMR ;  AL-27 MAS NMR ;  EXTRA-FRAMEWORK ALUMINUM ;  HIGH-RESOLUTION NMR ;  Y-TYPE ZEOLITES ;  HYDROXYL-GROUPS ;  MQMAS NMR ;  SILICON TETRACHLORIDE ;  NONFRAMEWORK ALUMINUM ;  QUADRUPOLAR NUCLEI
语种: 英语
WOS记录号: WOS:000181555200015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138296
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.Chinese Acad Sci, Dalian Inst Chem Phys, Nat Gas Utilizat & Appl Catalysis Lab, Dalian 116023, Peoples R China

Recommended Citation:
Yan, ZM,Ding, MA,Zhuang, JQ,et al. On the acid-dealumination of USY zeolite: a solid state NMR investigation[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2003,194(1-2):153-167.
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