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Solid-state MAS NMR studies on the hydrothermal stability of the zeolite catalysts for residual oil selective catalytic cracking
Zhuang, JQ; Ding, M; Gang, Y; Yan, ZM; Liu, XM; Liu, XC; Han, XW; Bao, XH; Peng, X; Liu, ZM
KeywordSolid-state Mas Nmr Hydrothermal Stability Zeolites
Source PublicationJOURNAL OF CATALYSIS
2004-11-15
DOI10.1016/j.jcat.2004.08.034
Volume228Issue:1Pages:234-242
Indexed BySCI
SubtypeArticle
Funding Project502, 803
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
WOS KeywordNUCLEAR MAGNETIC-RESONANCE ; ANGLE-SPINNING NMR ; MULTIPLE ALUMINUM ENVIRONMENTS ; CHEMICAL-SHIFT ; HIGH-FIELD ; ZSM-5 ZEOLITE ; ACID SITES ; AL-27 MAS ; HEAVY OIL ; P-31
AbstractBy 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.
Language英语
URL查看原文
WOS IDWOS:000224756800024
Citation statistics
Cited Times:106[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/82651
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
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.
APA Zhuang, JQ.,Ding, M.,Gang, Y.,Yan, ZM.,Liu, XM.,...&Liu, ZM.(2004).Solid-state MAS NMR studies on the hydrothermal stability of the zeolite catalysts for residual oil selective catalytic cracking.JOURNAL OF CATALYSIS,228(1),234-242.
MLA Zhuang, JQ,et al."Solid-state MAS NMR studies on the hydrothermal stability of the zeolite catalysts for residual oil selective catalytic cracking".JOURNAL OF CATALYSIS 228.1(2004):234-242.
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