AUTHOR=Sápi András , Kashaboina Upendar , Ábrahámné Kornélia B. , Gómez-Pérez Juan Fernando , Szenti Imre , Halasi Gyula , Kiss János , Nagy Balázs , Varga Tamás , Kukovecz Ákos , Kónya Zoltán 

TITLE=Synergetic of Pt Nanoparticles and H-ZSM-5 Zeolites for Efficient CO2 Activation: Role of Interfacial Sites in High Activity

JOURNAL=Frontiers in Materials

VOLUME=6

YEAR=2019

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2019.00127

DOI=10.3389/fmats.2019.00127

ISSN=2296-8016

ABSTRACT=<p>Catalytic systems prepared by controlled processes play an important role in the utilization of CO<sub>2</sub> via catalytic hydrogenation to produce useful C1 chemicals (such as CO, CH<sub>4</sub>, and CH<sub>3</sub>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<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> = 30, 80, and 280) zeolite supports. The prepared catalysts were tested for the CO<sub>2</sub> hydrogenation in the temperature range of <italic>T</italic> = 473–873 K and ambient pressure, with CO<sub>2</sub>/H<sub>2</sub> = 1:4. Size-controlled Pt nanoparticles boosted the catalytic activity of the pure H-ZSM-5 zeolites resulted in ~16 times higher CO<sub>2</sub> consumption rate. The activity were ~4 times higher and CH<sub>4</sub> selectivity at 873 K was ~12 times higher over 0.5% Pt/H-ZSM-5 (SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> = 30) compared to 0.5% Pt/H-ZSM-5 (SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> = 280). <italic>In-situ</italic> 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.</p>