Ordered Hierarchical Porous Structure of PtSn/3DOMM-Al 2 O 3 Catalyst for Promoting Propane Non-Oxidative Dehydrogenation.

Herein, the hierarchical porous catalyst of 3-dimensional ordered macro-mesoporous (3DOMM) Al 2 O 3 supported active PtSn nanoparticles (NPs) was prepared by the combined synthesized path of evaporation-induced self-assembly with colloid crystal template (EISA-CCT) methods. The hierarchical macro-mesoporous composite structure can markedly increase the specific surface area, accommodate the diffusion of propene, and decrease the number of surface acid sites. In addition, the special surface property and pore structure of 3DOMM-Al 2 O 3 can modify the interaction between metals and substrates, as well as stabilize the metal nanoparticle, which promotes the formation of a highly active and stable PtSn phase. The PtSn/3DOMM-Al 2 O 3 catalyst exhibits higher productivity and stability than PtSn/Al 2 O 3 catalysts with macropore and mesopore structures. The PtSn/3DOMM-Al 2 O 3 catalyst displays the best catalytic performance with propylene selectivity over 95% at a propane conversion of 33.9%. The study of the ordered hierarchical porous structure of PtSn/3DOMM-Al 2 O 3 catalysts can contribute to obtaining improved catalysts in industrial processes.