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
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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.
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Keywords:
- HCHO,
- Hydrotalcite derivate,
- Active phase,
- Cobalt oxide
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