通过XRD,N2吸附和吡啶FT-IR等方法考察了Mg的添加对Mo/ZSM-5催化剂物化性质的影响. 吡啶FT-IR结果表明,Mo-Mg/ZSM-5催化剂上Lewis酸中心与Brnsted酸中心的比值随着Mg添加量的增加而增大. 在甲烷芳构化反应中,虽然催化剂上的积碳量随着Mg含量的增加而减少,但只有6%Mo-0.75%Mg/ZSM-5催化剂表现出比6%Mo/ZSM-5催化剂更好的稳定性,6%Mo-2%Mg/ZSM-5和6%Mo-3%Mg/ZSM-5两个催化剂的稳定性均比6%Mo/ZSM-5催化剂差. 根据催化剂稳定性与酸性的关系提出,在有足够Brnsted酸中心存在的前提下,可以通过调变Lewis酸中心和Brnsted酸中心的比值来提高催化剂的稳定性.
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