CO2-assisted propane dehydrogenation over of zirconia-titania catalysts: Effect of the carbon dioxide to propane ratios on olefin yields

The propane dehydrogenation assisted by CO2 was investigated by using zirconia and titania catalysts. The objective of the research was to assist the olefins yield of propylene and ethylene from the dehydrogenation of propane gas. The catalysts were characterized using XRD, SEM, and TPD/TPR. The molar ratios of CO2 of 1.4, 2.6, and 12.2 to propane were used; and the conversion of propane was reduced, while increase of CO2 ratio to propane whereas the propylene selectivity increased. The increase of CO/H-2 ratio of reverse water-gas shift reaction was an important for the olefins yield and catalytic stability for 29-203 h without regeneration. The utilization of CO2 showed an increase the propane dehydrogenation to produce propylene to ethylene ratio of 2.8 and a total olefin yield 40-45% over Zr-Ti oxide catalysts was achieved. The study demonstrated the important role of CO2 presence in the propane dehydrogenation.