Stable and Active Au Catalyst Supported on CeMnO3 Perovskite for Selective Oxidation of Glycerol

Kunhong Jiang; Zhenyu Li; Zehao Zhang; Jiefei Li; Xingyue Qi; Jian Zhou; Xiaojing Wang; Hang Wei; Haibin Chu

doi:10.1021/acs.inorgchem.3c00444

Stable and Active Au Catalyst Supported on CeMnO₃ Perovskite for Selective Oxidation of Glycerol

Inorg Chem. 2023 May 29;62(21):8145-8157. doi: 10.1021/acs.inorgchem.3c00444. Epub 2023 May 15.

Authors

Kunhong Jiang¹, Zhenyu Li², Zehao Zhang¹, Jiefei Li¹, Xingyue Qi¹, Jian Zhou¹, Xiaojing Wang¹, Hang Wei¹, Haibin Chu¹

Affiliations

¹ College of Chemistry and Chemical Engineering, Inner Mongolia Engineering and Technology Research Center for Catalytic Conversion and Utilization of Carbon Resource Molecules, Inner Mongolia University, Hohhot 010021, China.
² State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

PMID: 37186870
DOI: 10.1021/acs.inorgchem.3c00444

Abstract

The selective oxidation of glycerol holds promise to transform glycerol into value-added chemicals. However, it remains a big challenge to achieve satisfactory selectivity toward the specific product at high conversion due to the multiple reaction pathways. Here, we prepare a hybrid catalyst via supporting Au nanoparticles on CeMnO₃ perovskite with a modest surface area, achieving promoted conversion of glycerol (90.1%) and selectivity of glyceric acid (78.5%), which are much higher than those of CeMnO_x solid-solution-supported Au catalysts with larger surface area and other Ce-based or Mn-based Au catalysts. The strong interaction between Au and CeMnO₃ perovskite facilitates the electron transfer from the B-site metal (Mn) in the CeMnO₃ perovskite to Au and stabilizes Au nanoparticles, which results in the enhanced catalytic activity and stability for glycerol oxidation. Valence band photoemission spectral analysis reveals that the uplifted d-band center of Au/CeMnO₃ promotes the adsorption of the glyceraldehyde intermediate on the catalyst surface, which benefits further oxidation of glyceraldehyde into glyceric acid. The flexibility of the perovskite support provides a promising strategy for the rational design of high-performance glycerol oxidation catalysts.