甲醛
莫来石
臭氧
催化作用
化学
大气温度范围
解吸
相对湿度
化学工程
材料科学
吸附
陶瓷
冶金
有机化学
气象学
工程类
物理
作者
Fangxie Shen,Xiang Wan,Lijing Wang,Chunning Zhao,Shen Zhang,Anqi Dong,Kai Shi,Haijun Zhang,Xiaomeng Zhou,Kaifei He,Yinchang Feng,Weichao Wang
标识
DOI:10.1021/acs.est.2c07843
摘要
Large ambient temperature changes (-20->25 °C) bring great challenges to the purification of the indoor pollutant formaldehyde. Within such a large ambient temperature range, we herein report a manganese-based strategy, that is, a mullite catalyst (YMn2O5) + ozone, to efficiently remove the formaldehyde pollution. At -20 °C, the formaldehyde removal efficiency reaches 62% under the condition of 60,000 mL gcat-1 h-1. As the reaction temperature is increased to -5 °C, formaldehyde and ozone are completely converted into CO2, H2O, and O2, respectively. Such a remarkable performance was ascribed to the highly reactive oxygen species generated by ozone on the YMn2O5 surface based on the low temperature-programed desorption measurements. The in situ infrared spectra showed the intermediate product carboxyl group (-COOH) to be the key species. Based on the superior performance, we built a consumable-free air purifier equipped with mullite-coated ceramics. In the simulated indoor condition (25 °C and 30% relative humidity), the equipment can effectively decompose formaldehyde (150 m3 h-1) without producing secondary pollutants, rivaling a commercial removal efficiency. This work provides an air purification route based on the mullite catalyst + ozone to remove formaldehyde in an ambient temperature range (-20->25 °C).
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