"Chainmail catalysis" improves efficiency of CO oxidation at room temperature

04-Nov-2021 - China

CO Oxidation at room temperature is significant for gas purification. Pt promoted by 3d transition metals (TMs) is a promising candidate for this reaction. However, TMs are prone to be deeply oxidized in an oxygen-rich atmosphere, leading to low activity.

Recently, a research group led by Prof. DENG Dehui from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) designed a chainmail catalysis of graphene-isolated Pt from CoNi nanoparticles (Pt|CoNi) for CO oxidation at room temperature.

CoNi alloy was protected by ultrathin graphene shell from oxidation and therefore modulated the electronic property of Pt-graphene interface via electron penetration effect. It achieved near 100% CO conversion at room temperature, while there were limited conversions over Pt/C and Pt/CoNiOx catalysts.

By experiments and theoretical calculations, the researchers indicated that CO could saturate Pt sites, but O₂ could adsorb at the Pt-graphene interface without competing with CO, which facilitated the O₂ activation and the subsequent surface reaction.

"The graphene-isolated system in this work is distinct from the classical metal-metal oxide interface for catalysis, and it provides a new thought for the design of heterogeneous catalysts," said Prof. DENG.

Original publication

Wang, Y., Ren, P., Hu, J. et al.; "Electron penetration triggering interface activity of Pt-graphene for CO oxidation at room temperature"; Nat Commun; 12, 5814 (2021)

https://www.chemeurope.com/en/news/1173390/chainmail-catalysis-improves-efficiency-of-co-oxidation-at-room-temperature.html

Original publication

Wang, Y., Ren, P., Hu, J. et al.; "Electron penetration triggering interface activity of Pt-graphene for CO oxidation at room temperature"; Nat Commun; 12, 5814 (2021)

Topics

carbon monoxide Oxidation transition metals graphene catalysis

Show all

Organizations

DICP