Carbon Monoxide Combustion on Metal Oxide Supported Au@Cu_xO Catalysts at Low Temperature

ABSTRACT

Au@Cu_xO core-shell structure nanoparticles (NPs) have been designed and used for CO catalytic combustion to improve Au catalysts’ activity and stability and decrease the cost. The catalytic performance of Au@Cu_xO/Metal Oxide has been affected a lot by the Au NPs’ nature, the core-shell structural perfection, the shell thickness and the support type. It proved that Au particles prepared with neutral aqueous solution (pH = 7) is more feasible to be used as the active component of combustion catalysts. The suitable amount of Cu(NO₃)₂ used for Au@Cu_xO preparation has led to the formation of more core-shell structure NPs with thin shell thickness thus lead to high activity. Among all the oxides studied here, Co₃O₄ is the best catalyst support. Both the catalytic activity and stability of Au@Cu_xO/Co₃O₄ are high. The Au content in the catalysts is only 0.11 wt% and the 90% CO conversion temperature is 132°C. CO can even combust on Au@Cu_xO/Co₃O₄ at room temperature with 51% conversion and without any loss after 72-h reaction.

KEYWORDS:

• Carbon monoxide
• Au@Cu_xO
• core-shell structure
• low temperature combustion

Acknowledgments

This research was supported by the Shanghai Natural Science Foundation (19ZR1418900), National Key Research and Development Program of China (2017YFB0102900), National Natural Science Foundation of China (61671284; U1704255), Shanghai Pujiang Program (17PJD016) and the Shanghai Municipal Education Commission (Peak Discipline Construction program). We also acknowledge the Instrumental Analysis and Research Center of Shanghai University for providing measurement services.