The composition and acidic properties of the catalysis have been characterized by XRD, XPS and TPD. It shows that the Co exists in the form of Co 3O 4, CoAl 2O 4 besides the mainly forms CoO.

• 利用XRD ,XPS ,TPD等表征手段分析了催化剂的组成及其酸性 ,结果表明 :催化剂中的Co除了以CoO的形式存在外 ,还有Co3O4和CoAl2 O4的形式 ;