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题名: Synthesis of SAPO-34 with rich Si(4Al) coordination environment in the framework and its catalytic performance in methanol-to-olefins reaction
作者: Xu Lei1, 2;  Du Aiping1;  Wei Yingxu1;  Meng Shuanghe1;  He Yanli1;  Wang Yingli1, 2;  Yu Zhengxi1, 2;  Zhang Xinzhi1;  Liu Zliongmin1
关键词: SAPO-34 molecular sieve ;  hydrogen fluorine ;  Si (4Al) coordination environment ;  methanol-to-olefins reaction
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2008-08-01
卷: 29, 期:8, 页:727-732
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 ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: SAPO-34 molecular sieve samples with rich Si(4Al) coordination environment were synthesized by adding HF in the initial gel. The crystalline phase, crystal morphology, elemental composition and Si coordination environment of the as-synthesized samples were determined by means of X-ray diffraction, scanning electron microscopy, X-ray fluorescence spectroscopy, and nuclear magnetic resonance. The crystallization of SAPO-34 molecular sieve can be adjusted by adding HF In the initial gel, and correspondingly, the Si coordination modeling can be controlled. The proportion of Si(4Al) species in the as-synthesized SAPO-34 increased, and that of Si(nAl)(n = 3-0) decreased with increasing fluorine ion content in the initial gel. The catalytic performance of the SAPO-34 catalysts with various Si coordination was investigated in the methanol-to-olefins reaction. The results showed that SAPO-34 catalysts with rich Si(4Al) coordination structure had higher selectivity to ethylene and longer life time.
关键词[WOS]: MOLECULAR-SIEVES ;  SILICON INCORPORATION ;  NMR ;  FLUORIDE ;  CRYSTALLIZATION ;  ZEOLITES ;  TEMPLATE ;  MORPHOLINE ;  CONVERSION ;  IONS
语种: 英语
WOS记录号: WOS:000259341000011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141082
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, Dalian 116023, Liaoning, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Xu Lei,Du Aiping,Wei Yingxu,et al. Synthesis of SAPO-34 with rich Si(4Al) coordination environment in the framework and its catalytic performance in methanol-to-olefins reaction[J]. CHINESE JOURNAL OF CATALYSIS,2008,29(8):727-732.
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