Effects of iron doping on the oxidation/reduction properties of delafossite CuAlO2 synthesized via a solid-state reaction

Abstract

CuAlO2 has received a wealth of interdependent research associated with hydrogen-based catalysis in the chemical industry. Herein, Fe-doped CuAlO2 is demonstrated to reduce the redox temperature for delafossite CuAlO2. Time-resolved X-ray absorption spectroscopy and hydrogen temperature-programmed reduction were used to characterize the redox properties, respectively. Delafossite CuAlO2, with and without Fe doping at 10 at% (CuAl0.9Fe0.1O2), was synthesized via a one-step solid-state reaction method. The results demonstrate that the redox temperature can be reduced by ~ 60 K for the 10 at% Fe-doped catalyst. The findings of this contribution offer a new approach to circumvent the high temperatures associated with the redox processes, and furthermore, offer a design basis for the development of new catalyst systems with enhanced regeneration abilities.