Catalytic non-oxidative propane dehydrogenation over promoted Cr-Zr-Ox: Effect of promoter on propene selectivity and stability
Shanlei Han, Tatiana Otroshchenko, Dan Zhao, Henrik Lund, Uwe Rodemerck, David Linke, Manglai Gao, Guiyuan Jiang, Evgenii V. Kondratenko
Abstract
The effect of Cs-, Ca- and P-containing promoters for binary Cr-Zr-Ox on propene selectivity and catalyst stability with time-on-stream in the non-oxidative propane dehydrogenation was elucidated. Large improvements in this catalytic performance were achieved when combining Cs and P promoters. They were suggested to partially block dehydrogenation sites resulting in the isolation of the latter. As a reason thereof, coke formation through propene oligomerization is inhibited in favor of propene desorption from the catalyst surface. The present catalysts achieved ~30% conversion of propane at WHSV (C3H8) of 5.89 h-1 at 550 °C in comparison with 20% over K-CrOx/Al2O3. The selectivity to propene was determined to be ~94%.