High-performance Ce doped three-dimensional ordered macroporous Co-based catalysts on CO oxidation. Issue 7 (15th February 2023)

• Record Type: Journal Article
• Authors: Zhou, Kun; Hu, Miaomiao; Zhao, Tingyi; Shi, Qingzhao; Feng, Jiaxin; Ma, Xue; Zhao, Mingqin; Shao, Zhihui; Cui, Bing
• Is Part Of: Catalysis science & technology. Volume 13:Issue 7(2023)
• Page Start: 2015
• Page End: 2025
• Publication Date: 2023-02-15
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d2cy01242a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : 3D-Co16 Ce1 O y had the highest CO catalytic performance and the lowest E a attributed to the synergistic promotion of the 3DOM structure and Ce doping. Abstract : A series of Co3 O4 and Co x Ce1 O y catalysts were successfully prepared by a colloidal crystal template method, and various characterization results confirmed the formation of a three-dimensional ordered microporous (3DOM) structure and Ce doping into the lattice of Co3 O4 . The catalytic activity of the prepared catalysts was measured on CO oxidation. Compared with a bulk catalyst, 3D-Co3 O4 and 3D-Co x Ce1 O y were more favorable for CO diffusion and had the advantage in terms of contact state with CO. In addition, XPS and d-band center results demonstrated that Ce doping regulated the valence states of Co ions and produced more Co 3+ with stronger oxidation capacity, enhancing the intrinsic activity. Meanwhile, the DFT calculation of the adsorption energy for O2 and CO showed that 3D-Co16 Ce1 O y could easily utilize O2 and adsorb CO preferentially. Under the synergistic promotion of the 3DOM structure and Ce doping, 3D-Co16 Ce1 O y has the best catalytic activity performance ( T 50 = 124.8 °C) and the lowest activation energy ( E a = 95.85 kJ mol −1 ). Besides, the stability test showed that the catalyst has good thermal stability. Therefore, the combined improvement in morphology and intrinsic activity has a bright prospect for the synthesis of high-performance CO oxidation catalysts.