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

doi:10.1016/S1872-2067(19)63273-0

Abstract

Abstract:

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.

Key words: HCHO, Hydrotalcite derivate, Active phase, Cobalt oxide

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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63273-0

https://www.cjcatal.com/EN/Y2019/V40/I5/703

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