(535b) Highly Selective Synthesis of Liquid Petroleum Gas from CO2 Hydrogenation over Czza/?-Zeolite Catalyst

The selective hydrogenation of CO₂ to produce valuable liquid petroleum gas (LPG) is a desirable yet challenging process due to the concurrent occurrence of numerous competing reactions. Herein, we report the development of a Cu/ZrO₂/ZnO/Al₂O₃ (CZZA) and β-zeolite composite catalyst that exhibited remarkable LPG selectivity of 80.3% among hydrocarbons (not including CO) at a CO₂ conversion rate of 34.5% under relatively mild conditions of 300°C and 2 MPa in a fixed bed reactor. Notably, a significant LPG yield of 19.5% was achieved, outperforming the majority of previously reported studies. Furthermore, this exceptional catalytic performance was maintained for an extended period of 160 hours, demonstrating excellent stability. Remarkably, an even higher LPG yield of 23% was obtained by increasing the pressure to 3 MPa, owing to the promotion of secondary hydrogenation reactions over the β-zeolite and the inhibition of CO formation under a higher pressure. This research provides a promising strategy for the highly selective synthesis of LPG from CO₂ hydrogenation, offering a potential solution to convert greenhouse gases into valuable liquid fuels.