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题名: Solid-state MAS NMR studies on the hydrothermal stability of the zeolite catalysts for residual oil selective catalytic cracking
作者: Zhuang, JQ;  Ding, M;  Gang, Y;  Yan, ZM;  Liu, XM;  Liu, XC;  Han, XW;  Bao, XH;  Peng, X;  Liu, ZM
关键词: solid-state MAS NMR ;  hydrothermal stability ;  zeolites
刊名: JOURNAL OF CATALYSIS
发表日期: 2004-11-15
DOI: 10.1016/j.jcat.2004.08.034
卷: 228, 期:1, 页:234-242
收录类别: SCI
文章类型: Article
项目归属: 502, 803
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: By using the solid-state MAS NMR technique, the hydrothermal stabilities (under 100% steam at 1073 K) of HZSM-5 zeolites modified by lanthanum and phosphorus have been studied. They are excellent zeolite catalysts for residual oil selective catalytic cracking (RSCC) processes. It was indicated that the introduction of phosphorus to the zeolite via impregnation with orthophosphoric acid led to dealumination as well as formation of different Al species, which were well distinguished by Al-27 3Q MAS NMR. Meanwhile, the hydrothermal stabilities of the zeolites (P/HZSM-5, La-P/HZSM-5) were enhanced even after the samples were treated under severe conditions for a prolonged time. It was found that the Si-O-Al bonds were broken under hydrothermal conditions, while at the same time the phosphorous compounds would occupy the silicon sites to form (SiO)(x)Al(OP)(4 - x) species. With increasing time, more silicon sites around the tetrahedral coordinated Al in the lattice can be replaced till the aluminum is completely expelled from the framework. The existence of lanthanum can partially restrict the breaking of the Si-O-Al bonds and the replacement of the silicon sites by phosphorus, thus preventing dealumination under hydrothermal conditions. This was also proved by P-31 MAS NMR spectra. (C) 2004 Elsevier Inc. All rights reserved.
关键词[WOS]: NUCLEAR MAGNETIC-RESONANCE ;  ANGLE-SPINNING NMR ;  MULTIPLE ALUMINUM ENVIRONMENTS ;  CHEMICAL-SHIFT ;  HIGH-FIELD ;  ZSM-5 ZEOLITE ;  ACID SITES ;  AL-27 MAS ;  HEAVY OIL ;  P-31
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000224756800024
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82651
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

Recommended Citation:
Zhuang, JQ,Ding, M,Gang, Y,et al. Solid-state MAS NMR studies on the hydrothermal stability of the zeolite catalysts for residual oil selective catalytic cracking[J]. JOURNAL OF CATALYSIS,2004,228(1):234-242.
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