Boron Nitride Nanosheet Supported Pt/Cu cluster as High-Efficiency Catalyst for Propane Dehydrogenation
Minimizing platinum usage while maximizing its catalytic activity is attractive but challenging in the development of industrially important platinum catalyst. Herein, by using a hexagonal boron nitride (h-BN) nanosheet supported Pt/Cu cluster catalyst, we report a promotion on platinum utilization efficiency and catalytic performance in propane dehydrogenation. Specifically, as little as 100 ppm platinum exhibits high propane conversion (~15%) and propylene selectivity (>99%) at a relatively low reaction temperature (520 C); and the formation rate of propylene reaches 7.3 mol molPt-1 s-1, which is about 10 times higher than the best value of the reported Pt/Cu single-atom alloy catalyst. Structural analysis reveals that abundant fault edges of h-BN nanosheet and strong bonding of copper with edge B-O defect maintain a unique geometry of Pt/Cu cluster, together with metallic platinum ensemble stabilizing on the top layer of copper cluster, leading to remarkable improvement on catalytic efficiency. Such a prominent promotion in catalytic efficacy also is exemplified using other supports including Al2O3, SBA-15 and SiC as counterparts.