催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (2): 119-123.

• 研究论文 • 上一篇    下一篇

用固体核磁共振研究HZSM-35分子筛的酸性

刘勇1,2,张维萍1,谢素娟1,徐龙伢1,韩秀文1,包信和1   

  1. 1 中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连 116023; 2 中国科学院研究生院, 北京 100049
  • 收稿日期:2009-02-25 出版日期:2009-02-25 发布日期:2012-11-21

Acidity Characterization of HZSM-35 Zeolite by Solid-State NMR

LIU Yong1,2, ZHANG Weiping1*, XIE Sujuan1, XU Longya1, HAN Xiuwen1, BAO Xinhe1*   

  1. 1 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2009-02-25 Online:2009-02-25 Published:2012-11-21

PDF

813

被引次数

11

摘要： 分别采用氘代吡啶和三甲基膦为探针分子,利用高分辨固体核磁共振技术研究了HZSM-35分子筛与探针分子之间的相互作用以及分子筛的酸性. 结果表明,探针分子氘代吡啶能够进入分子筛的十元环孔道和八元环孔道,但需在300 ℃下长时间吸附才能扩散到八元环开口的孔穴中. 吸附氘代吡啶后的1HMAS NMR谱和吸附三甲基膦后的31PMAS NMR谱表明,这两种孔道中均具有两种酸强度不同的B酸位,并且B酸的数量多于L酸的数量.

关键词: HZSM-35分子筛, 酸性, 固体核磁共振, 探针分子, 三甲基膦, 氘代吡啶

Abstract: The diffusion of deuterated pyridine molecules into the cavities of eight-membe red ring pores was very slow, and it took a long time to reach the adsorption eq u ilibrium at 300 ℃. After adsorption of deuterated pyridine, the 1H MAS NM R spectra showed that there were two types of Brnsted acidic sites with differ ent strength in both the 10-MR channels and 8-MR cavities.

Key words: HZSM-35 zeolite, acidity, solid-state nuclear magnetic resonance, probe molecule, trimethylphosphine, deuterated pyridine