Ga/HZSM-5芳构化催化剂的研究——K、V、B第二组分改性对甲醇、丙烷转化的影响  

Ga/HZSM-5 AROMATIZATION CATALYSTS ——INFLUENCE OF K,V,B MODIFICATION ON TRANSFORMATON OFMETHANAOL AND PROPANE

作　　者：高志贤[1] 程昌瑞[1] 朱华青[1] 谭长瑜[1] 周敬来[1] 

机构地区：[1]中国科学院山西煤炭化学研究所

出　　处：《燃料化学学报》1997年第1期11-15,共5页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金

摘　　要：考察了Ｋ、Ｖ、Ｂ等对Ｇａ／ＨＺＳＭ５催化剂的改性后表面酸性质和Ｇａ组分状态分布的变化以及对甲醇、丙烷芳构化催化作用的异同。结果表明，Ｖ、Ｂ改性后提高了甲醇转化的芳烃选择性，降低了丙烷的芳构化活性。在Ｂ改性催化剂上，甲醇／丙烷偶合转化生成产物中芳烃的选择性低，但低碳烯烃的选择性高。最后提出对不同的催化反应过程，要求不同的强酸中心与活性组分镓相匹配。The acidic property and Gallium state of K,V,B modified Ga/HZSM 5 aswellas their catalytic properties for aromatization of methanol or/and propane have beenstudied The results showed that the aromatics selectivity was inereased for methanol trans formationwhile the catalytic activity was decreased for propane transformation over Vor BmodifiedGa/HZSM 5 Both propane and methanol could not be converted to aromatic hy drocarbonseffectively over Kmodified Ga/HZSM 5 due to the fact that the surface acidity of catalyst was largely reduced by exchanging H + for K + A lower selectivity of aromatics butahigher selectivity of light alkenes was obtained for coupled conversion of methanol/propaneon Bmodified catalyst It is proposed that a balance between acidity and active Gallumfor different catalytic transformation could be found

关 键 词：丙烷 甲醇 芳构化 催化剂 改性 沸石分子筛 

分 类 号：O643.36[理学—物理化学] O647.33[理学—化学]