Catalytic Performance of In/HZSM‐5 for Coupling Propane with CO₂ to Propylene

The dehydrogenation of propane to propylene is endothermic reaction will generate hydrogen, while the hydrogenation of CO₂ to light olefins is exothermic reaction with hydrogen as reactant. Using the CO₂ 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 CO₂ 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, H₂‐TPR, NH₃‐TPD, XPS, TG, and N₂ isothermal adsorption‐desorption. Effects of indium loading, feed volume ratio of propane to CO₂, reaction pressure and temperature on the coupling of propane with CO₂ to propylene were investigated in a fixed‐bed reactor. When the mass content of indium is 12%, the feeding volume ratio of propane to CO₂ 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 CO₂ is 17.74% and 5.08%, respectively.