不同类型分子筛催化剂的焦化苯烷基化性能比较

COMPARISON OF CATALYTIC PROPERTIES OF DIFFERENT ZEOLITES IN THE ALKYLATION OF COKING BENZENE

分别以纳米级HZSM-5、微米级HZSM5、HY、Hβ为催化剂，以焦化苯与乙醇烷基化反应为探针反应，考察其催化性能。结果表明，纳米HZSM-5具有更高的活性和乙苯选择性、较低的失活速率。分子筛催化剂的积炭量随其酸量增强而增加；分子筛催化剂的积炭失活表现出结构相关性，有超笼结构的分子筛失活速率更快。

The catalytic properties of nano-scale HZSM-5, micro-scale HZSM-5, HY and Hβ were investigated in the alkylation of coking benzene with ethanol. NH3-TPD and TG were employed to characterize the acid properties and coke, respectively. The results showed that the nano-scale HZSM-5 has higher activity, selectivity and longer operation life than other types of zeolites. Deactivation speed depends strongly on not only the acid density but also topology framework. Both large acid density and intrisic＂cage＂in the framework lead to fast deactivation.