No abstract

Catalytic systems prepared by controlled processes play an important role in the utilization of CO 2 via catalytic hydrogenation to produce useful C1 chemicals (such as CO, CH 4 , and CH 3 OH), which will be vital for forthcoming applications in energy conversion and storage. Size-controlled Pt nanoparticles were prepared by a polyol method and deposited on H-ZSM-5 (SiO 2 /Al 2 O 3 = 30, 80, and 280) zeolite supports. The prepared catalysts were tested for the CO 2 hydrogenation in the temperature range of T = 473-873 K and ambient pressure, with CO 2 /H 2 = 1:4. Size-controlled Pt nanoparticles boosted the catalytic activity of the pure H-ZSM-5 zeolites resulted in ∼16 times higher CO 2 consumption rate. The activity were ∼4 times higher and CH 4 selectivity at 873 K was ∼12 times higher over 0.5% Pt/H-ZSM-5 (SiO 2 /Al 2 O 3 = 30) compared to 0.5% Pt/H-ZSM-5 (SiO 2 /Al 2 O 3 = 280). In-situ DRIFTS studies assuming the presence of a surface complex in which the CO is perturbed by hydrogen and adsorbes via C-end on Pt but the oxygen tilts to the protons of the zeolite support.