Balancing surface acidity, oxygen vacancies and Cu+ of CuOx/CeO2 catalysts by Nb doping for enhancing CO oxidation and moisture resistance and lowering byproducts in plasma catalysis

Abstract The development of a non-noble metal catalyst is a challenging task in plasma catalysis to achieve high CO conversion and low amount of by-products (O3 and NOx) under low energy input and high humidity conditions. In this study, we have prepared several Nb-doped CuOx/CeNbOx catalysts with various Ce/Nb molar ratios. Among them, CuOx/Ce0.9Nb0.1Ox catalyst exhibited the highest CO conversion (>90%) and the lowest by-product emissions (O3