不同晶粒大小HZSM-5载体对甲烷无氧芳构化反应的影响  

Effects of Support HZSM-5 with Different Crystal Size on Catalytic Performance of Mo/HZSM-5 for Methane Non-oxidative Aromatization

作　　者：张贺[1] 李钢[1] 王祥生[1] 刘毅慧[1] 陈永英[1] 苏玲玲[2] 包信和[2] 徐奕德[2] 

机构地区：[1]大连理工大学精细化工国家重点实验室,辽宁大连116012 [2]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《分子催化》2003年第1期70-74,共5页Journal of Molecular Catalysis(China)

基　　金：国家重点基础研究资助项目(G1999022400).

摘　　要：将不同晶粒大小的HZSM-5做为甲烷无氧芳构化反应催化剂的载体,系统研究了不同晶粒大小HZSM-5载体对反应的影响.研究发现,不同晶粒大小HZSM-5担载Mo催化剂具有不同的催化反应性能,同一体系下合成的不同晶粒大小的HZSM-5,其催化剂的催化活性与HZSM-5的酸量成正比,进一步证实了载体HZSM-5在该反应中起到酸催化作用;对于酸量相近的HZSM-5,其粒度越小,催化性能越好.纳米级HZSM-5担载Mo催化剂,其反应性能优于微米级HZSM-5担载Mo催化剂.以纳米HZSM-5为载体的6%Mo/HZSM-5催化剂具有最佳的反应性能:反应60min时,甲烷转化率为15.45%,苯收率为6.01%.The effects of support properties on catalytic performance of Mo/HZSM\|5 for methane non\|oxidative aromatization have been studied. HZSM\|5 samples with different crystal size are characterized by SEM(TEM), XRD, XRF, NH3\|TPD and BET. Catalytic performance of 6% Mo/HZSM\|5 catalysts with different crystal size investigated show that HZSM\|5 with stronger acidity has higher activity of reaction. There is a close correlation between activity and acidity of HZSM\|5. Catalytic performance of 6% Mo/HZSM\|5 with same acidity but different crystal size was also tested. The results show that the smaller crystal size provides higher activity. Based on above results, it is suggested that HZSM\|5 is not only support of catalyst, but also plays an acid catalytic role. Influence of nanosize HZSM\|5 and microsize HZSM\|5 zeolites on catalytic performance of Mo/HZSM\|5 for methane non\|oxidative aromatization revealed that. nanosize HZSM\|5 loaded with Mo has much better catalytic performance than that of microsize HZSM\|5 loaded with Mo.

关 键 词：载体 甲烷 无氧芳构化反应 MO/HZSM-5 晶粒大小 钼 分子筛 负载型催化剂 

分 类 号：O623.11[理学—有机化学] O643.36[理学—化学]