催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (3): 396-401.DOI: 10.1016/S1872-2067(11)60360-4

• 研究快讯 • 上一篇    下一篇

室温 MnOx 上 O3 氧化脱除空气中甲醛

赵德志1, 丁天英2, 李小松1, 刘景林1, 石川1, 朱爱民1,*   

  1. 1大连理工大学等离子体物理化学实验室, 辽宁大连 116024; 2大连理工大学机械工程学院, 辽宁大连 116024
  • 收稿日期:2011-11-28 修回日期:2011-12-27 出版日期:2012-03-15 发布日期:2015-07-27

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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摘要： 采用氧化还原法制备了 MnOx 催化剂, Ｘ射线衍射结果表明其主要为无定形结构. 在甲醛和臭氧浓度分别为 137 和 642 mg/m3, 相对湿度为 56% (25 oC), GHSV 为 2 × 105 h-1 条件下, MnOx 催化剂上 O3 可将甲醛全部氧化为 CO2, 反应 150 min 内甲醛转化率和 CO2 选择性一直保持在~100%. 另外, 当臭氧与甲醛的摩尔比约为 2:3, 即显著低于化学计量比时, CO2 选择性仍可达~100%. 采用傅里叶变换红外光谱仪在线分析了甲醛氧化反应产物, 未检测到任何副产物, 从而确认了 MnOx 催化剂上 O3 对甲醛的完全氧化.

关键词: 氧化锰催化剂, 甲醛, 完全氧化, 臭氧

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