Effect of Ce/Co ratio on the catalytic performance of Ag/CeO2-Co3O4 in the low-temperature oxidation of formaldehyde

TANG Tong; WEI Guang-cheng; WANG Hui-min; LIU Mo; ZHANG Qiu-lin; NING Ping

Volume 47 Issue 5

May 2019

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Article Navigation > Journal of Fuel Chemistry and Technology > 2019 > 47(5): 590-597

TANG Tong, WEI Guang-cheng, WANG Hui-min, LIU Mo, ZHANG Qiu-lin, NING Ping. Effect of Ce/Co ratio on the catalytic performance of Ag/CeO2-Co3O4 in the low-temperature oxidation of formaldehyde[J]. Journal of Fuel Chemistry and Technology, 2019, 47(5): 590-597.

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TANG Tong, WEI Guang-cheng, WANG Hui-min, LIU Mo, ZHANG Qiu-lin, NING Ping. Effect of Ce/Co ratio on the catalytic performance of Ag/CeO₂-Co₃O₄ in the low-temperature oxidation of formaldehyde[J]. Journal of Fuel Chemistry and Technology, 2019, 47(5): 590-597.

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Effect of Ce/Co ratio on the catalytic performance of Ag/CeO₂-Co₃O₄ in the low-temperature oxidation of formaldehyde

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China

Funds:

The project was supported by the National Key Research and Development Program 2018YFC0213400

Received Date: 2019-01-17
Rev Recd Date: 2019-03-02

Available Online: 2021-01-23

Publish Date: 2019-05-10

Abstract

Abstract

A series of Ag/CeO₂-Co₃O₄ catalysts with various Ce/Co ratios were prepared by co-precipitation method and employed in the low-temperature oxidation of formaldehyde. The results demonstrate that the Ag/CeO₂-Co₃O₄ catalysts exhibit excellent performance in the oxidation of formaldehyde and the Ce/Co ratio has a significant impact on the catalytic performance. The XRD, nitrogen adsorption-desorption, Raman spectroscopy, H₂-TPR and in-situ DRIFTS results illustrate that with the increase of Co content in Ag/CeO₂-Co₃O₄, the pore volume increases whereas the surface area decreases. The presence of CeO₂ is beneficial to enhancing the redox ability and increasing the oxygen vacancies and Co²⁺ species, which can promote the activation of oxygen species and then the degradation of formaldehyde. According to the in-situ DRIFTS results, the decomposition of formates on the catalyst surface is probably the rate-determining step for the degradation of formaldehyde at low temperature.
- co-precipitation,
- CeO₂-Co₃O₄,
- formaldehyde oxidation,
- oxygen vacancy,
- formate

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References(37)

References

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