波谱学杂志 ›› 2004, Vol. 21 ›› Issue (2): 237-241.

• 研究简报 • 上一篇    下一篇

焙烧对HL沸石结构的影响

刘兴玉*,丁淑芳,潘惠芳,王京   

  1. 石油大学(北京)CNPC催化重点实验室,北京 102249;石油化工科学研究院,北京 100083
  • 收稿日期:2003-11-24 修回日期:2004-01-02 出版日期:2004-06-05 发布日期:2004-06-05
  • 基金资助:

    中国石油化工股份有限公司科学技术研究开发项目资助(J102011)

STRUCTURE CHANGES OF HL ZEOLITE AFTER CALCINATION

 LIU Xing-Yu*, DING Shu-Fang, PAN Hui-Fang,WANG Jing   

  1. CNPC Key Laboratory of Catalysis, University of Petroleum, Beijing 102249, China; Research Institute of Petroleum Processing,Beijing 100083,China
  • Received:2003-11-24 Revised:2004-01-02 Online:2004-06-05 Published:2004-06-05
  • Supported by:

    中国石油化工股份有限公司科学技术研究开发项目资助(J102011)

摘要:

运用MAS NMR研究了焙烧对HL沸石结构的影响. 结果表明,高温焙烧将引起HL沸石骨架的脱铝,当焙烧温度高于650 ℃后,沸石骨架脱铝明显;27Al MAS NMR谱表明,从沸石上脱下来的铝,部分形成了NMR不可测的无定形态,且随焙烧温度的升高,NMR不可测铝增多.

关键词: 29Si MAS NMR, 27Al MAS NMR, 结构, 焙烧, 脱铝, HL沸石

Abstract:

The effect of calcination temperature (from 773 K to 1 073 K) on the structure of HL zeolite was studied using 29Si and 27]Al MAS NMR. The NMR spectra of zeolite were greatly influenced by calcination. The backbone of HL zeolite suffered from severe dealumination by calcination at temperatures higher than 923 K. The results from 27Al MAS NMR measurements implied that Al in the backbone of zeolite was only partially NMRvisible. The NMR-invisible Al increased with the increase of calcination temperature.

Key words: NMR, magic angle spinning, calcination, zeolite, dealumination

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