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题名: Study of Mn incorporation into SAPO framework: Synthesis, characterization and catalysis in chloromethane conversion to light olefins
作者: Wei, YX;  He, YL;  Zhang, DH;  Xu, L;  Meng, SH;  Liu, ZM;  Su, BL
关键词: SAPO-34 ;  MnAPSO-34 ;  molecular sieves ;  Mn incorporation ;  Si islands ;  acidity ;  ammonia adsorption ;  chloromethane conversion ;  light olefins
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2006-03-20
DOI: 10.1016/j.micromeso.2005.10.042
卷: 90, 期:1-3, 页:188-197
收录类别: SCI
文章类型: Article
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
英文摘要: MnAPSO-34 molecular sieve has been synthesized with triethylamine as the template, characterized with XRD, XRF, P-31, Al-27 and Si-21 NMR and FT-IR techniques and compared with SAPO-34. The template decomposition and removal have been investigated with TG-DTG-DSC coupled with mass spectrometer. Mn incorporation generates a negligible difference On the chemical shift in P-31 and Al-27 MAS NMR, while an effect on the intensity of resonance peaks is revealed. Si-29 MAS NMR study has demonstrated that Mn incorporation favors the Si island formation, which may give rise to the stronger acidic sites. The thermal analysis (TG-DSC) on template removal in a diluted oxygen atmosphere, leading to the formation Of CO2, NO and H2O, showed, besides a low temperature endothermic weight loss due to the desorption of water, two weight losses (200-400 and 400-600 degrees C) for SAPO-34 and MnAPSO-34, suggesting two different chemical location environments of template molecules in these two molecular sieves. The quantity of template removed at higher temperature range is much higher in MnAPSO-34, indicating stronger template-framework interaction and stronger acidity after calcination. The acid difference caused by Mn incorporation has also been evidenced by ammonia adsorption evaluated by FT-IR. Chloromethane transformation was carried out over MnAPSO-34 and SAPO-34 and the catalytic performance showed that both molecular sieves are very active and selective catalyst for light olefins production. MnAPSO-34 demonstrated higher activity and light olefins selectivity. (c) 2005 Elsevier Inc. All rights reserved.
关键词[WOS]: SILICOALUMINOPHOSPHATE MOLECULAR-SIEVES ;  CRYSTALLINE INORGANIC SOLIDS ;  BRONSTED ACID SITES ;  INFRARED-SPECTROSCOPY ;  SILICON INCORPORATION ;  THERMAL-DECOMPOSITION ;  HYDROCARBON FORMATION ;  METHANOL CONVERSION ;  REACTION-MECHANISM ;  TOPOLOGICAL MODEL
语种: 英语
WOS记录号: WOS:000236051100021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140208
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.Univ Namur, ISIS, Lab Chim Mat Inorgan, B-5000 Namur, Belgium
2.Chinese Acad Sci, Dalian Inst Chem Phys, Nat Gas Utilizat & Appl Catalysis Lab, Dalian 116023, Peoples R China

Recommended Citation:
Wei, YX,He, YL,Zhang, DH,et al. Study of Mn incorporation into SAPO framework: Synthesis, characterization and catalysis in chloromethane conversion to light olefins[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2006,90(1-3):188-197.
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