Effect of different properties of silicon-based support on propane dehydrogenation performance of PtZn bimetallic catalyst

In this work, the bimetallic PtZn catalysts are further supported by a simple impregnation method starting from different carriers, including commercial and conventional silicalite-1 (CS1 and SS1) zeolite, self-pillared silicalite-1 zeolites (SP-S-1-n, where n represents different kinds) and amorphous SiO2. All the catalysts are calcined at the same and lower temperature (400 °C) for better and accurate comparison. The different properties of these catalysts, such as phase structure, surface and bulk states, coke content, acidity and initial intrinsic cracking capacity, etc. are compared in great detail and correlated with activity by XAS, AC-STEM, XPS, CO-DRIFTS and so on. The results show that the performance of SS1 supported PtZn bimetallic catalyst is better than that of catalysts with smaller Pt particle size and higher diffusion rate, and no deactivation phenomenon is observed in the 4d reaction in pure propane atmosphere. The compatibility between the support and the bimetal are considered to play a key role in the dehydrogenation of propane.