Citation: Bin Zhu, Xiao-Song Li, Peng Sun, Jing-Lin Liu, Xiao-Yuan Ma, Xiaobing Zhu, Ai-Min Zhu. A novel process of ozone catalytic oxidation for low concentration formaldehyde removal[J]. Chinese Journal of Catalysis, ;2017, 38(10): 1759-1769. doi: 10.1016/S1872-2067(17)62890-0 shu

A novel process of ozone catalytic oxidation for low concentration formaldehyde removal

Bin Zhu ^a,b,c, ,
Xiao-Song Li ^b,c ,
Peng Sun ^b,c ,
Jing-Lin Liu ^b,c ,
Xiao-Yuan Ma ^b,c ,
Xiaobing Zhu ^b,c ,
Ai-Min Zhu ^b,c

a. Collaborative Innovation Center for Vessel Pollution Monitoring and Control, Dalian Maritime University, Dalian 116026, Liaoning, China;
b. Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, China;
c. Center for Hydrogen Energy & Environmental Catalysis, Dalian University of Technology, Dalian 116024, Liaoning, China

Received Date: 2 June 2017
Revised Date: 19 July 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21673030) and the Higher Education Development Fund (for Collaborative Innovation Center) of Liaoning Province, China (20110217004).

To reduce energy costs, minimize secondary pollution from undecomposed ozone, and improve the efficiency of ozone use, a novel process of cycled storage-ozone catalytic oxidation (OZCO) was employed to remove formaldehyde (HCHO) at low concentrations in air. We applied Al₂O₃-supported manganese oxide (MnO_x) catalysts to this process, and examined the HCHO adsorption capacity and OZCO performance over the MnO_x catalysts. Owing to the high dispersion of MnO_x and low oxidation state of manganese, the MnO_x/Al₂O₃ catalysts with a manganese acetate precursor and 10%-Mn loading showed good performance in both storage and OZCO stages. The presence of H₂O led to a decrease of the HCHO adsorption capacity owing to competitive adsorption between moisture and HCHO at the storage stage; however, high relative humidity (RH) favored complete conversion of stored HCHO to CO₂ at the OZCO stage and contributed to an excellent carbon balance. Four low concentration HCHO storage-OZCO cycles with a long HCHO storage period and relatively short OZCO period were successfully performed over the selected MnO_x/Al₂O₃ catalyst at room temperature and a RH of 50%, demonstrating that the proposed storage-OZCO process is an economical, reliable, and promising technique for indoor air purification.
- Formaldehyde removal,
- Storage,
- Ozone,
- Catalytic oxidation,
- Manganese oxide catalyst
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