High entropy oxide has shown to be good catalyst support for many chemical reactions. However, preparation of metal nanoparticle catalyst supported on high entropy oxide (HEO) support is time-consuming and takes multiple complicated steps. Herein we used a one-step glycine-nitrate combustion method to synthesize highly dispersed rhodium species on a high surface area high entropy oxide. This catalyst shows a high selectivity to produce CO in CO2 hydrogenation and high activity compared to other rhodium-based catalysts. We’ve also studied the effect of different metal elements in HEO and demonstrated that high CO selectivity is achieved if there is one of the metals that favors CO production. We identified that copper and zinc are responsible for high CO selectivity over CH4 due to the preferred reaction pathway and the intrinsically increase activation energy for CH4 production. Besides, the combination of five different metals into high entropy metal oxide enables a high CO production rate compared to single zinc oxide or copper oxide catalyst support.

One-step synthesis of high entropy oxide catalyst support for highly selective CO production in CO2 hydrogenation reaction

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