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- Title
ZIF-67 Derived Cu-Co Mixed Oxides for Efficient Catalytic Oxidation of Formaldehyde at Low-Temperature.
- Authors
Zhao, Qingsong; Xiang, Ning; Wen, Shiting; Huo, Haibo; Li, Qiaoyan
- Abstract
It is still an intractable problem to exploit high-efficient Co-based catalysts for low-temperature HCHO oxidation. Herein, we synthesized a series of Cu-doped Co3O4 catalysts (Cu1Co8, Cu1Co4, and Cu1Co2 corresponded to 1/8, 1/4, and 1/2 of Cu/Co molar ratios, respectively) via in situ pyrolysis of bimetal Cu-ZIF-67 precursors and the pure Co3O4 sample was also prepared through directly annealing monometal ZIF-67 for comparison. Performance tests of HCHO oxidation found that Cu doping remarkably enhanced the low-temperature HCHO oxidation performance of Co3O4 sample, and thereinto the Cu1Co4 possessed the optimal HCHO oxidation activity, which achieved 90% HCHO conversion at 108 °C. The characterization results revealed that the stronger interaction between Cu and Co species (Co2+ + Cu2+ ↔ Co3+ + Cu+) of Cu1Co4 not only facilitates the formation of defect sites, Co3+ and surface adsorbed oxygen species but also improves its low-temperature reducibility, and consequently resulting in its superior HCHO oxidation performance. Furthermore, the in-situ DRIFTS results suggested that the formaldehyde oxidation over Cu1Co4 followed HCHO → H2CO2 → HCOO− → CO32− → CO2 pathway. The present work provides a novel and facile approach to fabricating highly effective Co-based catalysts for low-temperature HCHO oxidation.
- Subjects
CATALYTIC oxidation; COPPER; OXIDES; LAMINATED metals; OXIDATION; PYROLYSIS; FORMALDEHYDE
- Publication
Catalysts (2073-4344), 2023, Vol 13, Issue 1, p117
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal13010117