为探究Mo基、W基催化剂的丙烷脱氢性能,分别以ZSM-5分子筛和S-1分子筛为载体,通过浸渍法制备了5%负载量的Mo基、W基催化剂,并通过活性测试检测其催化活性,发现同为5%负载量下Mo基催化剂的活性要高于W基催化剂。以不同硅铝摩尔比的ZSM-5为载体制备1% Mo基催化剂,研究载体酸性对催化活性的影响。结果表明,随着硅铝摩尔比的逐渐增大,其B酸量降低,从而稳态下的转化率逐渐变小;与之相反,目标产物丙烯的选择性随着硅铝摩尔比逐渐增大而增大。

In order to explore the performance of Mo-based and W-based catalysts in propane dehydrogenation,5%-loading Mo-based and W-based catalysts are prepared by the impregnation method with ZSM-5 zeolite and S-1 zeolite as carriers,respectively.The samples' catalytic activity are evaluated.It is found that the Mo-based catalyst exhibits a higher catalytic activity than W-based catalyst under the same 5% loading.Furthermore,a 1% Mo-based catalyst is prepared using ZSM-5 with different Si/Al ratio as the support,and the effect of the acidity of the support on the catalytic activity is studied.It is verified that with the gradual increase of Si/Al ratio,the amount of B acid in catalyst decreases,so the conversion rate under steady state decreases gradually.On the contrary,the selectivity of the target product propylene increases with the gradual increase of Si/Al ratio in catalyst.