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锌在ZnZSM-5沸石中的形态及其催化作用
引用本文:佘励勤,王多才,李宣文,刘兴云,韩明.锌在ZnZSM-5沸石中的形态及其催化作用[J].物理化学学报,1994,10(3):247-253.
作者姓名:佘励勤  王多才  李宣文  刘兴云  韩明
作者单位:Department of Chemistry, Peking University, Beijing 100871; Department of Chemistry, Sichuan Normal College, Nanchong 637002
摘    要:采用NH_3-TPD和吡啶吸附红外光谱法,研究了不同含Zn量ZnHZSM-5沸石中Zn的存在状态.结果表明,用浸渍方式将Zn引入到HZSM-5沸石后,在NH_3-TPD谱上产生两个新的NH_3脱附峰.峰位分别在原HZSM-5沸石的低温峰与高温峰之间和比高温峰较高温区处,其相应的吸附中心分别以L_1、L_2表示.L_1可能与ZnHZSM-5沸石上ZnO物种相对应; L_2与吡啶吸附红外光谱的L_(1616)吸收带有关,可能与ZnHZSM-5上的ZnOH~+物种相对应.丙烷芳构化反应结果表明,芳烃收率随L_2的脱附NH_3量的增加有一最宜值,而活性的稳定性则随之降低。

关 键 词:ZnZSM-5  丙烷  芳构化  NH3-TPD  吡啶吸附红外光谱  沸石  
收稿时间:1992-07-30
修稿时间:1993-02-16

The States of Zinc in ZnZSM-5 Zeolites and their Catalysis
She Liqin, Li Xuanwen, Liu Xingyun, Han Ming.The States of Zinc in ZnZSM-5 Zeolites and their Catalysis[J].Acta Physico-Chimica Sinica,1994,10(3):247-253.
Authors:She Liqin  Li Xuanwen  Liu Xingyun  Han Ming
Institution:Department of Chemistry, Peking University, Beijing 100871; Department of Chemistry, Sichuan Normal College, Nanchong 637002
Abstract:NH3-TPD and pyridine adsorption IR spectroscopy techniques have been used to study the zinc states in ZnHZSM-5 zeolite containing various zine content. The results indicate that, in addition to two desorption peaks for HZSM-5 zeolite located at about 533 and 733K, two new peaks located at about 573 and 873 K were observed. These new peaks are believed to be associated with two kinds of zinc sites designated by L1,L2 .The adsorbed ammonia amount of L2 corresponds to the amount of L1616 acid characterized by pyridine adsorption IR spectra for ZnHZSM-5 zeolite with various zinc contents.It is possible that there are two kinds of zinc states in ZnHZSM-5 zeo lite. One kind of them is ZnO species with weak acidity, the other is ZnOH+ species with strong acidity which can promote the activity and has an effect on stability of activity for aromatization of propane.
Keywords:ZnHZSM-5  Propane  Aromatization  NH_3-TPD  Pyridine adsorption IR spectra  Zeolite
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