Effect of supports on catalytic activity of chromium oxide-based catalysts in the dehydrogenation of propane with CO2

Abstract

Dehydrogenation of propane in the presence and absence of CO 2 over CrO x /SiO 2 and CrO x /Al 2 O 3 catalysts with Cr loading between 0.7-20.4 wt% was discussed. It was found that the nature of support strongly effects on the catalytic performance in the dehydrogenation with CO 2 . Over the CrO x /SiO 2 catalyst CO 2 enhance the propene yield, whereas over the CrO x /Al 2 O 3 catalyst the yield and selectivity of propene in the presence of CO 2 strongly decrease. The effect of steam on catalytic performance of the tested catalysts was also discussed.

Deactivation of VMgO x Catalysts by Coke in the Process of Isobutane Dehydrogenation with Carbon Dioxide

“…Especially, the activity of chromium, vanadium and gallium oxide supported catalysts is intensively studied [21][22][23][24][25][26][27]. In the previous paper [21] we reported the results of dehydrogenation of isobutane with carbon dioxide over a series of VMgO x catalysts prepared by citrate method.…”

Role of CO2 in dehydrogenation of propane over CrOX/SiO2 catalyst with low Cr content

“…At higher Cr contents the reduction produces Cr 2 O 3 , and then it stops, due to the high stability of this oxide [17]. Such redox behaviour of SiO 2 -supported chromium oxide catalysts may explain the previous observations [6,8], which reveal that the promoting effect of CO 2 on the yield of propene decreases with increasing Cr content.…”

“…Recently, it has been reported that the chromium containing catalysts are also active in the dehydrogenation of hydrocarbons in the presence of CO 2 [6][7][8][9][10][11][12][13][14]. It has been found that in this process CO 2 acts not only as a diluent and a heating medium but also as an oxidant.…”

“…Over Al 2 O 3 or ZrO 2 supported chromium oxide catalysts CO 2 exerts an inhibiting effect on the dehydrogenation reaction [6,13]. Moreover, few studies have reported that over the silica supported chromium oxide catalyst, the promoting effect of CO 2 , measured as the ratio of the yield of propene obtained in CO 2 to that in an inert gas atmospheree, depends on the chromium loading, and rises with decreasing Cr content [6,8].…”

Oxidative dehydrogenation of propane by molecular chlorine

“…The catalytic dehydrogenation of propane is the most direct and selective route for the production of propylene. The dehydrogenation of propane is performed over variety of catalysts, notably, over Cr 2 O 3 , MoO 3 , V 2 O 5 , TiO 2 , and GeO 2 [2][3][4]. The main problem limiting the industrial application of this method is the necessity to use high temperatures in order to increase the olefin equilibrium concentration since the dehydrogenation of propane is an endothermic reaction:…”