高等学校化学学报

高等学校化学学报 ›› 1986, Vol. 7 ›› Issue (4): 357.

• 研究论文 • 上一篇    下一篇

HZSM-11分子筛的催化性能及酸性质的研究

胡家芬, 贾怡伟   

  1. 复旦大学化学系
  • 收稿日期:1984-11-27 出版日期:1986-04-24 发布日期:1986-04-24

Studies on Catalytic Activity and Acidic Properties of HZSM-11 Zeolites

Hu Jiafen, Jia Yiwei   

  1. Department of Chemistry, Fudan University, Shanghai
  • Received:1984-11-27 Online:1986-04-24 Published:1986-04-24

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被引次数

1

摘要： 用脉冲微反方法研究了不同温度下不同硅铝比的HZSM-11分子筛上邻二甲苯异构化活性和选择性。结果表明,硅铝比增加,二甲苯异构化活性变化不大。用TPD技术研究了不同硅铝比的HZSM-11的酸性质,测得了NH2在HZSM-11上的程脱谱。结果表明,在HZSM-11表面上有两种强度的酸中心。硅铝比增加,弱酸中心数减少,强酸中心数基本不变。

Abstract: The catalytic activity and the catalytic selectivity for p-xylenc in the o-xylene isomerization reaction at different temperatures over HZSM-11 with different SiO2/Al2O3 ratios were measured by means of the pulse technique. The results show that the catalytic activity changes a little with the increase of the SiO2/Al2O3 ratio.TPDchromatograms of ammonia adsorbed on HZSM-11 were obtained. The results show that the weak acid sites of HZSM-11 decrease with increasing the SiO2/Al2O3 ratio of HZSM-11 but that the strong acid sites do not change obviously, Jn addition, we also obtained the distribution of acidic strength, and the lowest acidic strength at which the o-xylene isomerization reaction takes placc.

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