室温MnO_x上O_3氧化脱除空气中甲醛  

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

作　　者：赵德志[1] 丁天英[2] 李小松[1] 刘景林[1] 石川[1] 朱爱民[1] 

机构地区：[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

出　　处：《催化学报》2012年第3期396-401,共6页

基　　金：国家自然科学基金(11079013);国家高技术研究发展计划(863计划;2007AA06Z311)~~

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642mg/m3,相对湿度为56%(25oC),GHSV为2×105h-1条件下,MnOx催化剂上O3可将甲醛全部氧化为CO2,反应150min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.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.

关 键 词：氧化锰催化剂 甲醛 完全氧化 臭氧 

分 类 号：X51[环境科学与工程—环境工程] O643.32[理学—物理化学]