Water-gas-shift over metal-free nanocrystalline ceria: an experimental and theoretical study
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A tandem experimental and theoretical investigation of a mesoporous ceria catalyst reveals the properties of the metal oxide are conducive for activity typically ascribed to metals, suggesting reduced Ce3+ and oxygen vacancies are responsible for the inherent bi-functionality of CO oxidation and dissociation of water required for facilitating the production of H-2. The degree of reduction of the ceria, specifically the (100) face, is found to significantly influence the binding of reagents, suggesting reduced surfaces harbor the necessary reactive sites. The metal-free catalysis of the reaction is significant for catalyst design considerations, and the suite of in situ analyses provides a comprehensive study of the dynamic nature of the high surface area catalyst system. This study postulates feasible improvements in catalytic activity may redirect the purpose of the water-gas shift reaction from CO purification to primary hydrogen production.
CitationGuild, C., Vovchok, D., Kriz, D., Bruix, A., Hammer, B., Llorca, J., Xu, W., El-Sawy, A., Biswas, S., Rodriguez, J.A., Senanayake, S., Suib, S. Water-gas-shift over metal-free nanocrystalline ceria: an experimental and theoretical study. "ChemCatChem", 21 Abril 2017, vol. 9, núm. 8, p. 1373-1377.