Boosting reactivity of water-gas shift reaction by synergistic function over CeO_2-x/CoO_1-x/Co dual interfacial structures.

ABSTRACT: Dual-interfacial structure within catalysts is capable of mitigating the detrimentally completive adsorption during the catalysis process, but its construction strategy and mechanism understanding remain vastly lacking. Here, a highly active dual-interfaces of CeO_2-x/CoO_1-x/Co is constructed using the pronounced interfacial interaction from surrounding small CeO_2-x islets, which shows high activity in catalyzing the water-gas shift reaction. Kinetic evidence and in-situ characterization results revealed that CeO_2-x modulates the oxidized state of Co species and consequently generates the dual active CeO_2-x/CoO_1-x/Co interface during the WGS reaction. A synergistic redox mechanism comprised of independent contribution from dual functional interfaces, including CeO_2-x/CoO_1-x and CoO_1-x/Co, is authenticated by experimental and theoretical results, where the CeO_2-x/CoO_1-x interface alleviates the CO poison effect, and the CoO_1-x/Co interface promotes the H₂ formation. The results may provide guidance for fabricating dual-interfacial structures within catalysts and shed light on the mechanism over multi-component catalyst systems.

SUBMITTER: Fu XP 

PROVIDER: S-EPMC10611738 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature