Citation: Mengya Lin, Xiaolin Yu, Xueqin Yang, Xiuyun Ma, Maofa Ge. Exploration of the active phase of the hydrotalcite-derived cobalt catalyst for HCHO oxidation[J]. Chinese Journal of Catalysis, ;2019, 40(5): 703-712. doi: S1872-2067(19)63273-0 shu

Exploration of the active phase of the hydrotalcite-derived cobalt catalyst for HCHO oxidation

Mengya Lin ^a,b, ,
Xiaolin Yu ^a,b ,
Xueqin Yang ^a,b ,
Xiuyun Ma ^a,b ,
Maofa Ge ^a,b,c

a State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Research Center for Molecular Sciences(BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
b University of Chinese Academy of Sciences, Beijing 100049, China;
c CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian, China

Received Date: 17 October 2018
Revised Date: 5 December 2018

Fund Project: This work was support by the National Natural Science Foundation of China (91544227, 21777166) and the National Key R&

A series of Co-based oxide catalysts were prepared by calcining hydrotalcite precursors in different atmospheres and studied for HCHO catalytic oxidation. The N₂-calcined catalyst exhibits enhanced HCHO oxidation and superior stability. On the basis of H₂-TPR, X-ray photoelectron spectroscopy, and Raman characterizations, this can be ascribed to better redox ability, octahedrally coordinated Co²⁺ ions derived from the CoO phase, and other surface oxygen species, such as O₂^- or O^-. The extra octahedrally coordinated Co²⁺ ions may reside in a more open framework site than the inactive tetrahedrally coordinated Co²⁺ ions. This species of Co²⁺ can easily make contact with oxygen and oxidize. The surface oxygen species, along with the octahedrally coordinated Co²⁺ ions, and a part of the Co³⁺ species constitute the Co²⁺-oxygen species-Co³⁺ sites, which enhance the catalytic activities. According to DRIFTS, Co²⁺-oxygen species-Co³⁺ makes oxidation of HCHO and conversion of DOM to formate easier.
- HCHO,
- Hydrotalcite derivate,
- Active phase,
- Cobalt oxide
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