Critical Roles of Surface Oxygen Vacancy in Heterogeneous Catalysis over Ceria-based Materials: A Selected Review

Surface oxygen vacancies, dynamically created and annihilated under the reaction conditions, may serve as a unique form of active site for heterogeneous catalysis. In this study, mechanisms selected reactions (i.e., CO oxidation, water-gas shift, CO2 hydrogenation, alcohol carbonation, selective catalytic reduction NO with NH3) proposed by in-situ spectroscopy characterizations were reviewed to elucidate critical roles surface vacancies in catalysis over ceria-based materials. It is demonstrated that vacancy interact reactants intermediates through enhanced adsorption activation promote overall Operando studies enable coupled simultaneous kinetic measurements are highly recommended further advance fundamental understanding ceria vacancy,