Ga_2O_3/HZSM-5催化剂的XRD、XPS和TPR研究  

XRD, XPS and TPR Study of Ga 2O 3/HZSM 5 Catalyst

作　　者：高志贤[1] 程昌瑞[1] 谭长瑜[1] 

机构地区：[1]中国科学院山西煤炭化学研究所

出　　处：《分子催化》1997年第4期268-272,共5页Journal of Molecular Catalysis(China)

摘　　要：利用ＸＲＤ、ＸＰＳ、ＴＰＲ等技术对Ｇａ２Ｏ３／ＨＺＳＭ５催化剂进行表征，结果表明，催化剂中镓组分以聚集态和分散态的形式存在．其中聚集态中αＧａ２Ｏ３在一定条件下可转化为βＧａ２Ｏ３；分散态又可分为游离Ｇａ２Ｏ３和与ＨＺＳＭ５产生相互作用的镓组分．催化剂预处理条件及反应—再生过程均对镓的分布及状态有较大影响．Ga 2O 3/HZSM 5 catalyst has been studied by XRD, XPS and TPR techniques. It has shown that Ga component could be divided into two parts: aggregative and dispersed Ga species. α Ga 2O 3 was transformed into β Ga 2O 3 under due condition. Furthermore the dispersed Ga species constitute of free Ga 2O 3 and active Ga species which had strong interaction with HZSM 5. The Ga state and distribution were influenced by pretreatment and reaction regeneration condition. The well dispersed Ga species which had strong interaction with HZSM 5 may be the active species for the aromatic reactions.

关 键 词：镓 催化剂 状态分布 催化 沸石催化剂 

分 类 号：O643.36[理学—物理化学] O643.32[理学—化学]