Fine-tuning Cu-Co-Ce oxidation activity interface by unique microwave electromagnetic loss for boosting CO preferential oxidation in H-2 steam

Construction of composite metal interfaces with synergistic catalysis is an important research field for CO preferential oxidation in H2 steam (CO-PROX). Microwave electromagnetic loss can effectively compensate the thermal action on the active interface derived from metal-organic frameworks (MOFs). Herein, a trimetallic CuCoCe-MOF is derived to construct Cu-Co-Ce oxidation active interface oriented by magnetic, conduction and relaxation loss, which inhibit the high temperature deactivation due to sintering. Equipped with the tandem microwave pyrolysis, the intermediate CuCoCe/C fully exposes electromagnetic characteristic and heterogeneous interfaces. Subsequently, microwave strengthened CuCoCeOx exhibits an excellent CO-PROX activity window with the more than 85% CO conversion within 80-210 & DEG;C. Besides, in-situ Raman and in-situ DRIFTs investigations demonstrate that the equilibrium of active interfacial oxygen vacancy via hydrogen is crucial for the temperature window broadening of CO-PROX. This work provides a route for the efficient conversion of microwave electromagnetic energy to enhance the active interface for synergistic catalysis. & COPY; 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.