高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (3): 368.

• 论文 • 上一篇    下一篇

脱铝八面沸石的研究(Ⅳ)--异丙苯催化裂化

徐国林1, 徐恒泳1, 孙希贤1, 田英1, 张盈珍2, 郑禄彬2   

  1. 1. 哈尔滨师范大学化学系, 150080;
    2. 中国科学院大连化学物理研究所
  • 收稿日期:1989-07-04 出版日期:1991-03-24 发布日期:1991-03-24
  • 通讯作者: 徐恒泳
  • 基金资助:

    国家自然科学基金;黑龙江省教委基金

Studies on Dealuminated Faujasite Zeolites (Ⅳ)--Catalytic Cracking of Cumene

Xu Guo-lin1, Xu Heng-yong1, Sun Xi-xian1, Tian Ying1, Zhang Ying-zhen2, Zheng Lu-bin2   

  1. 1. Department of Chemistry, Harbin Normal University, Harbin, 150080;
    2. Dalian Institute of Chemical Physics, Acudemia Sinioa, Dalian
  • Received:1989-07-04 Online:1991-03-24 Published:1991-03-24

摘要: 以脉冲微型反应技术研究了脱铝八面沸石对异丙苯的催化裂化行为,并与反应条件下表面酸性进行了关联。样品裂化活性随骨架Si/Al比增加呈山峰形变化,Si/Al=5.38时最大;反应条件下酸中心数随脱铝深度增加却单调降低。动力学数据表明,样品裂化反应速度常数与强质子酸中心数随骨架Si/Al比增加具有平行的山峰形变化规律,Si/Al比为8.87附近的样品最高。

关键词: 八面沸石脱铝, 硅铝比, 表面酸性, 催化裂化

Abstract: The cumene cracking activity on dealuminated faujasite zeolites was studied by using the pulse microreactor-chromatographic technique and correlated with their acidity which was measured by pyridine poising experiment under reaction conditions. It was shown that the cumene cracking activity on faujasites increased with increasing dealumination and reached a maximum at the Si/Al ratio 5. 38, then decreased with the Si/Al ratios increasing. While the active sites for cumene-cracking were decreased monotonously under reaction conditions, but were decreased slowly at a low dealumination. The rate constant k from kinetic research and the number of strong Bronsted acid sites changed in a similar peaky curve pattern. The maxima of two curves were on the same sample with Si/Al ratio about 8. 87.

Key words: Dealumination of faujasite, Si/Al ratio, Surface acidity, Catalytic cracking

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