PtSn负载量对PtSn/Al2O3催化剂上丙烷脱氢性能的影响

Influence of PtSn loadingon propane dehydrogenation over PtSn/Al_2O_3 catalysts

由丙烷直接催化脱氢制取丙烯已经成为增产丙烯的重要手段之一。以水热法制备Al_2O_3载体,采用等体积浸渍法制备不同PtSn负载量的PtSn/Al_2O_3催化剂。通过XRD、N2-吸附、拉曼光谱和H2-TPR等对其进行表征,并考察不同PtSn负载量对催化剂催化丙烷脱氢性能的影响。结果表明,在制备的催化剂中,Pt1.5Sn3/Al_2O_3具有最高的催化丙烷脱氢活性和稳定性,丙烷初始转化率高达55.6%,丙烯选择性98.1%。反应330 min后,丙烷转化率仅降约10%,选择性保持不变。

Recently,direct catalytic dehydrogenation of propane topropylene has already become oneof the significant ways for propyleneproduction.In this work,Al 2 O 3 support was synthesized by hydrothermal method,and PtSn/Al 2 O 3 catalysts with different PtSn loading amounts were prepared by incipient-wetness impregnation method.Physical and chemical properties of as-prepared catalysts were characterized bymeans of XRD、N 2-adsorption、Raman spectrum and H 2-TPR and so on.Influence of PtSn loading amounts of PtSn/Al 2 O 3 catalysts onpropane dehydrogenation was also investigated.Results showed that Pt 1.5 Sn 3/Al 2 O 3 catalyst had the highest activity and stability for dehydrogenation of propane among the as-prep ared catalysts.Initial conversion of propane was 55.6%and selectivity of propylene was 98.1%.After 330 minof reaction,conversion of propane decreased only about 10%and selectivity of propylene remained more than 98%.