The GC-MS analysis result of the coke on the deactivation catalyst shows that the dominating reason of inactivation is the hindrance effect of the carbons in the inactive Beta Zeolite.

• 结炭物质中，分子较大的连体双环、中间有亚甲基的长链双环和多环芳烃等物质的位阻效应是催化剂失活的主要原因。