Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (3): 396-401.DOI: 10.1016/S1872-2067(11)60360-4

• Research Briefing • Previous Articles     Next Articles

Ozone Catalytic Oxidation of HCHO in Air over MnOx at Room Temperature

ZHAO Dezhi1, DING Tianying2, LI Xiaosong1, LIU Jinglin1, SHI Chuan1, ZHU Aimin1,*   

  1. 1Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, China; 2School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2011-11-28 Revised:2011-12-27 Online:2012-03-15 Published:2015-07-27

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Abstract: The complete oxidation of HCHO in air with O3 over MnOx catalysts at room temperature was studied. The MnOx catalysts were prepared by a redox method. The catalysts showed amorphous patterns in X-ray diffraction characterization. Formaldehyde in simulated air containing 137 mg/m3 HCHO with 56% relative humidity (RH, 25 oC) was totally oxidized to CO2 by 642 mg/m3 O3 over the MnOx catalysts at GHSV (gas hourly space velocity) = 2 × 105 h-1. The formaldehyde conversion and CO2 selectivity were maintained at ~ 100% during 150 min time-on-stream. The effect of the molar ratio of O3 to HCHO was also investigated. At a O3 to HCHO molar ratio of 2:3, which was significantly lower than the stoichiometric ratio, a CO2 selectivity of 100% was still achieved. No byproduct was detected during HCHO oxidation with O3 over the MnOx catalysts using an online Fourier transform infrared spectrometer.

Key words: manganese oxide, formaldehyde, complete oxidation, ozone