This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility:

fact-checked

peer-reviewed publication

trusted source

proofread

New migration strategy to boost CO2 reduction to CO

New strategy boosting CO2 reduction to CO
In-situ generation of highly efficient H-transport channel for CO2 reduction to CO. Credit: Kang Hui

Classical strong metal–support interaction (SMSI) theory describes the way reducible oxide migrates to the surface of metal nanoparticles (NPs) to obtain metal@oxide encapsulation structure during high-temperature H2 thermal treatment, resulting in high selectivity and stability.

However, the encapsulation structure inhibits the adsorption and dissociation of reactant molecules (e.g., H2) over , leading to low activity, especially for the hydrogenation reaction.

Recently, a research group led by Prof. Liu Yuefeng from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) has proposed a new migration strategy, in which the TiO2 selectively migrates to second oxide support rather than the surface of metal NPs in Ru/(TiOx)MnO catalysts, boosting the CO2 reduction to CO via a reverse water–gas shift reaction.

The study was published in Nature Catalysis on Oct. 9.

The researchers achieved controlled migration by utilizing the between TiO2 and MnO in Ru/(TiOx)MnO catalysts during H2 thermal treatment, and TiO2 spontaneously re-dispersed on the MnO surface, avoiding the formation of TiOx shell on Ru NPs for the ternary (Ru/TiOx/MnO).

Meanwhile, high-density TiOx/MnO interfaces generated during the process and acted as a highly efficient H transportation channel with low barrier, and resulting in enhanced H-spillover for the migration of activated H species from metal Ru to support for consequent reaction.

The Ru/TiOx/MnO catalyst showed 3.3-fold for CO2 reduction to CO compared with a Ru/MnO catalyst. In addition, the Ti/Mn support preparation was not sensitive to the and grain size of TiO2 NPs. Even the mechanical mixing of Ru/TiO2 and Ru/MnOx enhanced the activity.

Moreover, the researchers verified that the synergistic effect of TiO2 and MnO didn't alter the catalytic intrinsic performance, and efficient H transport provided a large number of active sites () for the reaction process.

"Our study provides references for the design of novel selective hydrogenation catalysts via the in-situ creation of oxide–oxide interfaces acting as hydrogen species transport channels," said Prof. Liu.

More information: Hui Kang et al, Generation of oxide surface patches promoting H-spillover in Ru/(TiOx)MnO catalysts enables CO2 reduction to CO, Nature Catalysis (2023). DOI: 10.1038/s41929-023-01040-0

Journal information: Nature Catalysis

Citation: New migration strategy to boost CO2 reduction to CO (2023, October 24) retrieved 19 July 2024 from https://phys.org/news/2023-10-migration-strategy-boost-co2-reduction.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Surface oxygenate species enhance cobalt-catalyzed Fischer-Tropsch synthesis

1 shares

Feedback to editors