Catalytic Performance of In/HZSM‐5 for Coupling Propane with CO 2 to Propylene

The dehydrogenation of propane to propylene is endothermic reaction will generate hydrogen, while the hydrogenation of CO 2 to light olefins is exothermic reaction with hydrogen as reactant. Using the CO 2 hydrogenation reaction to consume the hydrogen from the propane dehydrogenation reaction, which is more beneficial to propylene generation. Thus, a promising approach of coupling propane with CO 2 to produce propylene was proposed. A simple wetness impregnation method was used to prepare the In/HZSM‐5 composite catalyst for this coupling reaction. It was characterized by means of XRD, SEM, TEM, H 2 ‐TPR, NH 3 ‐TPD, XPS, TG, and N 2 isothermal adsorption‐desorption. Effects of indium loading, feed volume ratio of propane to CO 2 , reaction pressure and temperature on the coupling of propane with CO 2 to propylene were investigated in a fixed‐bed reactor. When the mass content of indium is 12%, the feeding volume ratio of propane to CO 2 is 1 : 4, the reaction pressure is 0.3 MPa and the reaction temperature is 580 °C, the propylene selectivity is 71.41%, as well as the conversion per pass of propane and CO 2 is 17.74% and 5.08%, respectively.