Citation: Kai Li, Jian Ji, Yanling Gan, Haibao Huang. Regulation of mixed Ag valence state by non-thermal plasma for complete oxidation of formaldehyde[J]. Chinese Chemical Letters, ;2022, 33(1): 434-437. doi: 10.1016/j.cclet.2021.06.014 shu

Regulation of mixed Ag valence state by non-thermal plasma for complete oxidation of formaldehyde

Kai Li ^{a, b} ,
Jian Ji ^{a, b} ,
Yanling Gan ^{a, b} ,
Haibao Huang ^{a, b, *,}

a.
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
b.
Guangdong Indoor Air Pollution Control Engineering Research Center, Guangzhou 510006, China

seabao8@gmail.com

Received Date: 2 March 2021
Revised Date: 2 April 2021
Accepted Date: 3 June 2021
Available Online: 11 June 2021

Figures(3)

Formaldehyde is an important air pollutant and its removal is essential to protect human health and meet environmental regulations. Ag-based catalyst has a considerable potential for HCHO oxidation in low temperature range. The valence state of Ag is one of the key roles in formaldehyde catalytic oxidation. However, its effect on activity is still ambiguous. Non-thermal plasma and conventional calcination were employed to regulate Ag valence state in this study. Three Ag-Co/CeO₂ catalysts with totally different distribution of Ag species were obtained. A special mixed Ag valence state, ~50% Ag⁺ with a few Ag⁰ and Ag⁺, was achieved by plasma activation. It had the merits of both good activity and stability. A close relationship between Ag valence state and the activity for HCHO oxidation was established. The activity of different Ag species follows the order: Ag⁺ + Ag⁰ + Ag⁺ > Ag⁺ > Ag⁰ > Ag⁺.
- Ag valence,
- Non-thermal plasma,
- HCHO,
- Complete oxidation,
- Ag-based catalyst
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