催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (2): 179-184.

• 研究论文 • 上一篇    下一篇

乙苯脱氢制苯乙烯工业催化剂的失活原因

廖仕杰1,2,陈铜1,缪长喜1,杨为民1,谢在库1,陈庆龄1,2   

  1. 1 中国石油化工股份有限公司上海石油化工研究院, 上海 201209; 2 华东理工大学化学与分子工程学院, 上海 200237
  • 收稿日期:2008-02-25 出版日期:2008-02-25 发布日期:2012-01-15

Deactivation of the Industrial Catalyst for Ethylbenzene Dehydrogenation to Styrene

LIAO Shijie1,2, CHEN Tong1, MIAO Changxi1, YANG Weimin1, XIE Zaiku1, CHEN Qingling1,2*   

  1. 1 Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201209, China; 2 School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2008-02-25 Online:2008-02-25 Published:2012-01-15

PDF

1365

被引次数

16

摘要： 用混合法制备了工业乙苯脱氢催化剂,考察了新鲜催化剂和使用34个月后的催化剂的催化性能,并应用多种表征手段详细研究了所制备的工业催化剂在使用前后体相和表面的变化情况. 活性测试结果发现,催化剂使用34个月后,活性下降12%, 消炭后催化剂活性有所提高,但很快又恢复到失活后的水平. 表征结果发现,积炭、钾的流失和催化剂活性相的烧结都不是导致催化剂失活的根本原因,而助催化剂钾的不均匀分布和催化剂活性相中Fe3+的还原可能是催化剂失活的主要原因.

关键词: 催化剂失活, 乙苯脱氢, 苯乙烯, 铁, 钾

Abstract: The deactivation of the prepared industrial Fe-K catalyst for ethylbenzene dehydrogenation to styrene was characterized by X-ray powder diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed reduction, and Mossbauer spectroscopy. The activity of fresh and spent catalyst samples was evaluated in a fixed-bed reactor. The results showed that regeneration of the spent catalyst by coke burning could improve activity, but the activity was reduced to the level of the spent catalyst after a short time of reaction. The characterization results indicated that coke deposition, catalyst sintering, and potassium loss were not responsible for the catalyst deactivation. However, the migration and uneven redistribution of potassium and reduction of Fe3+were the major reasons for the deactivation.

Key words: catalyst deactivation, ethylbenzene dehydrogenation, styrene, iron, potassium