Chemical Engineering Science, Vol.200, 167-175, 2019
Highly dispersed Pt-based catalysts for selective CO2 hydrogenation to methanol at atmospheric pressure
Hydrogenation of CO2 into methanol is promising for achieving the sustainable energy economy, but still has some problems, e. g. low methanol selectivity and high operation pressures (> 10 atm). Herein, we prepared a Pt/film hybrid with highly dispersed Pt nanoparticles, and combined Pt/film with In2O3 to form a Pt/film/In2O3 catalyst. By using a dielectric barrier discharge (DBD) plasma reactor, a CO2 conversion of 37.0% and a methanol selectivity of 62.6% are achieved in the hydrogenation of CO2 with H-2 on Pt/film/In2O3 at 1 atm and 30 degrees C. These are higher than those on Pt/In2O3 prepared by the conventional high-temperature H-2 reduction (24.9% and 36.5%) and commercial Cu/ZnO/Al2O3 (25.6% and 35.1%). The high-energy electrons of the DBD plasma trigger the CO2 hydrogenation at 1 atm and 30 degrees C. The higher Pt nanoparticles dispersion, film and In2O3 promote the adsorption of CO2 on Pt/film/In2O3, thus enhancing the hydrogenation of CO2 into methanol. These results are helpful for efficient methanol production from CO2 hydrogenation under atmospheric pressure. (C) 2019 Elsevier Ltd. All rights reserved.