It was found that the disp ersion of MgO was related to the precursor of MgO and had an important effect on the behavior of MgO /HZSM-5cata-lyst.

• 发现前身物不同MgO在HZSM?5上的分散状态也不同催化剂的活性和选择性与MgO分散状态密切相关.