应用化学 ›› 1997, Vol. 0 ›› Issue (6): 90-92.

• 研究论文 • 上一篇    下一篇

Co/HZSM-5催化剂中Co的相态和价态表征及其与一步法合成苯乙烯活性之间的关系

张强, 金日光   

  1. 北京化工大学材料科学与工程学院, 北京 100029
  • 收稿日期:1997-03-01 修回日期:1997-07-18 出版日期:1997-12-10 发布日期:1997-12-10
  • 基金资助:
    中国石油化工科技开发公司基金

Relation Between the Phase and Valency State of Co on Co/HZSM-5 Catalyst and Its Reaction Activity on Direct Synthesis of Styrene

Zhang Qiang, Jin Riguang   

  1. College of Material Science and Technology, Beijing University of Chemical Technology, Beijing 100029
  • Received:1997-03-01 Revised:1997-07-18 Published:1997-12-10 Online:1997-12-10

摘要: 金属的脱氢能力与其存在的价态和相态有很大关系.我们曾采用金属负载HZSM-5分子筛催化剂研究了苯和乙烯在无氧存在下一步合成苯乙烯的反应,发现Co/HZSM-5,Fe/HZSM-5和Zn/HZSM-5是较好的催化剂,并提出反应是经过中间物乙苯脱氢生成苯乙烯的机理[1].魏铨等采用XPS技术对Co/HZSM-5催化剂中Co存在的相态和价态做了一些研究工作[2].本工作结合XRD、TPR和DRS方法对不同温度下焙烧及还原的Co/HZSM-5中Co的相态和价态及其与一步法合成苯乙烯反应活性之间的关系进行了研究。

关键词: Co/HZSM-5催化剂, 相态, 价态, 苯乙烯合成

Abstract: The Co species in Co/HZSM-5 appeared to be in the phase of Co3O4, CoO, CoAl2O4 spinel, exchanged Co species and metal Co, depending on the calcination and reduction temperature. Co species in the phase of Co3O4, CoO and exchanged Co were the active sites on styrene formation, but in the formation of styrene over metal Co phase the crystal plane of the catalyst plays an important role.

Key words: Co/HZSM-5 catalyst, phase state, valency state, styrene synthesis