Title Pt nanoparticles-loaded and noble-metal-free, mesoporous oxides as efficient catalysts for CO2 hydrogenation and dry reforming with methane Short title Noble-metal-free, mesoporous oxides for CO2 activation reactions Article type Full Length Article

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.

The steam reforming of ethanol (SRE) is a key process for the production of H 2 and other vital hydrocarbons. The present work describes the synthesis of Platinum-Gallium (PtÀ Ga) nanoalloys supported on mesostructured cellular foam (MCF-17) via ultrasound-assisted impregnation method. Ga was substituted with Pt in different wt.% i. e. Pt/MCF-17, Pt 99.9 Ga 0.1 /MCF-17, Pt 99 Ga 1 /MCF-17, and Pt 90 Ga 10 /MCF-17 and was evaluated towards the SRE at a temperature range of 473K-773 K towards hydrogen (H 2 ), acetaldehyde (CH 3 CHO), diethylether (DEE), ethylene (C 2 H 4 ), carbon monoxide (CO), carbon dioxide (CO 2 ), methane (CH 4 ), and ethane (C 2 H 6 ). The SRE activity and H 2 formation rate with Pt 90 Ga 10 /MCF-17 catalyst were observed to be 68.1 % and 3047.2 nmole g À 1 sec À 1 , which is 9.8 and 4.5 times more than the Pt/MCF-17 counterparts. Moreover, as observed from DRIFTS, NH 3 -TPD and XPS studies Ga showed high interaction with Pt in the electron deficit state which resulted in the increased dehydrogenating and acidic properties that resulted in a higher yield of H 2 .

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In the original publication of this article the author name Owais Al-Aqtash was incorrectly written as Owais Al-Aqtasha.The original article has been corrected.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.