CeO 2 -Promoted PtSn/SiO 2 as a High-Performance Catalyst for the Oxidative Dehydrogenation of Propane with Carbon Dioxide.

The oxidative dehydrogenation of propane with CO 2 (CO 2 -ODP) has been extensively investigated as a promising green technology for the efficient production of propylene, but the lack of a high-performance catalyst is still one of the main challenges for its industrial application. In this work, an efficient catalyst for CO 2 -ODP was developed by adding CeO 2 to PtSn/SiO 2 as a promoter via the simple impregnation method. Reaction results indicate that the addition of CeO 2 significantly improved the catalytic activity and propylene selectivity of the PtSn/SiO 2 catalyst, and the highest space-time yield of 1.75 g(C 3 H 6 )·g(catalyst) -1 ·h -1 was achieved over PtSn/SiO 2 with a Ce loading of 6 wt%. The correlation of the reaction results with the characterization data reveals that the introduction of CeO 2 into PtSn/SiO 2 not only improved the Pt dispersion but also regulated the interaction between Pt and Sn species. Thus, the essential reason for the promotional effect of CeO 2 on CO 2 -ODP performance was rationally ascribed to the enhanced adsorption of propane and CO 2 originating from the rich oxygen defects of CeO 2 . These important understandings are applicable in further screening of promoters for the development of a high-performance Pt-based catalyst for CO 2 -ODP.