Tailoring the active phase of CoO-based thin-film catalysts in order to tune selectivity in CO 2 hydrogenation.

Autor: Mohammadpour N; Department of Molecular Engineering, Faculty of Process and Environmental Engineering, Lodz University of Technology Wolczanska 213 93-005 Lodz Poland niloofar.mohammadpour@dokt.p.lodz.pl., Kierzkowska-Pawlak H; Department of Molecular Engineering, Faculty of Process and Environmental Engineering, Lodz University of Technology Wolczanska 213 93-005 Lodz Poland niloofar.mohammadpour@dokt.p.lodz.pl., Balcerzak J; Department of Molecular Engineering, Faculty of Process and Environmental Engineering, Lodz University of Technology Wolczanska 213 93-005 Lodz Poland niloofar.mohammadpour@dokt.p.lodz.pl., Tyczkowski J; Department of Molecular Engineering, Faculty of Process and Environmental Engineering, Lodz University of Technology Wolczanska 213 93-005 Lodz Poland niloofar.mohammadpour@dokt.p.lodz.pl.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2024 May 23; Vol. 14 (24), pp. 16758-16764. Date of Electronic Publication: 2024 May 23 (Print Publication: 2024).
DOI: 10.1039/d4ra02355b
Abstrakt: In this study, we prepared CoO-based thin films deposited on Kanthal steel wire gauze meshes by plasma-enhanced chemical vapor deposition. X-ray photoelectron spectroscopy (XPS) analysis revealed a structure characterized by a combination of cobalt oxide and metallic cobalt embedded within a carbon matrix. Our primary objective was to gain insights into the roles of Co 0 and CoO in CO 2 hydrogenation reactions. To achieve this, the performance of the thin-film CoO-based catalyst with an initial atomic ratio of CoO/Co 0 at 10.2 was compared with two series of the thin-film catalysts that underwent pre-reduction processes at 350 °C for durations of 30 and 60 minutes, resulting in atomic ratios of CoO/Co 0 at 3.1 and 1.1, respectively. Subsequently, catalytic tests were conducted in a continuous flow stirred tank reactor operating at temperatures ranging from 250 °C to 400 °C. Our findings indicate that CoO plays a significant role in activating the CO 2 methanation reaction which can be due to the high hydrogen coverage of CoO, while Co 0 is the active phase in the reverse water-gas shift reaction. Results highlight the importance of oxidized cobalt for hydrogen adsorption and dissociation in CO 2 hydrogenation for CH 4 formation.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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