Shape Effects of Ceria Nanoparticles on the Water?Gas Shift Performance of CuOx/CeO2 Catalysts

The copper–ceria (CuOx/CeO2) system has been extensively investigated in several catalytic processes, given its distinctive properties and considerable low cost compared to noble metal-based catalysts. fine-tuning of key parameters, e.g., the particle size shape individual counterparts, can significantly affect physicochemical subsequently performance binary oxide. To this end, present work focuses on morphology effects ceria nanoparticles, i.e., nanopolyhedra (P), nanocubes (C), nanorods (R), water–gas shift (WGS) CuOx/CeO2 Various characterization techniques were employed unveil effect structural, redox surface properties. According acquired results, support affects a different extent reducibility mobility oxygen species, following trend: R > P C. This consequently influences interactions stabilization partially reduced copper species (Cu+) through Cu2+/Cu+ Ce4+/Ce3+ cycles. Regarding WGS performance, bare supports exhibit no activity, while addition nanostructures alters behaviour. sample rod-like demonstrates best activity stability, approaching thermodynamic equilibrium conversion at 350 °C. greater abundance loosely bound vacancies highly dispersed Cu+ be mainly accounted for superior performance.