阳离子改性HZSM-5沸石上低碳醇转化为芳烃  

CONVERSION OF LOWER ALCOHOLS INTO AROMATICS OVER CATION-MODIFIED HZSM-5 ZEOLITES

作　　者：王锦业[1] 王定珠[1] 卢学栋[1] 窦秀云[1] 

机构地区：[1]中国科学院山西煤炭化学研究所

出　　处：《Chinese Journal of Catalysis》1993年第3期234-238,共5页催化学报（英文）

基　　金：国家自然科学基金;山西省自然科学基金

摘　　要：低碳醇等含氧化合物能在HZSM-5上选择转化为汽油和芳烃.HZSM-5用某些阳离子改性可提高甲醇和乙醇的芳构化活性.本文研究了阳离子改生HZSM-5沸石的酸性质变化与低碳醇芳构化反应性能之间的关系. 1.催化剂制备:将直接法ZSM-5原粉制成氢型（HZ）,SiO₂/Al₂O₃为37.再用离子交换法进行改性,制得Cu,Zn,Cd,Mn和Ga改性沸石。The acidity of the modified HZSM-5 zeolites was characterized by NH3-TPD, pyridine-TG and pyridine-IR methods. The catalytic conversion of C1-C4 alcohols was carried out in a pulse microreictor at 450C. The results show that the modification of HZSM-5 with Cu, Cd or Zn results in a decrease in B acidity, an increase in L acidity and an appearance of new L acid sites characterized by IR band between 1609-1616cm-1. No considerable change in acidic properties is observed for Ga-modified zeolite. The Ga-, Cd- and Zn-modified zeolites, especially the latter two, show a great improvement in the yield of aromatics from methanol due to the additional dehydrcgenatirig activity of the modifying species, but the Cu-modified zeolite is not so. C2-C4 alcohols also give high yield of aromatics over the Zn-modifiei zeolite, but the yield is somewhat lower than that from methanol.

关 键 词：HZSM-5沸石 阳离子 低碳醇 芳烃 

分 类 号：O625.1[理学—有机化学]