Abstract
Mg-doped manganese oxide octahedral molecular sieve(Mg-OMS-2)catalysts were prepared by hy-drothermal method.The photothermal degradation performance of these catalysts for formaldehyde(HCHO)in batch system and continuous system was investigated.The light absorption of OMS-2 was increased by Mg-doped,especially for near infrared light,which promoted surface temperature reach a maximum of 214.8 ℃ under xenon irradiation.At this temperature,the reinforced surface lattice oxy-gen and oxygen vacancy that formed by lattice distortion via Mg-doped were activated.The best HCHO elimination efficiency was achieved over Mg0.2/OMS-2 catalyst with Mg2+/Mn2+=1/5,which could re-duce HCHO from 250 ppm to 10 ppm within 20 min.The in situ DRIFTS was also carried out to monitor the changes in the content of reaction intermediates and analyze the degradation paths of HCHO.It was found the HCHO was attacked by formed·OH and·O2-to generate formate species and carbonate species,and finally transformed to CO2 and H2O.This photothermal catalytic oxidation process exhibited a high efficiency purification of HCHO without the help of extra energy consumption.
基金项目
国家自然科学基金(51908491)
Ministry of science and Technology Project of China(2017YFE0127400)
浙江省自然科学基金(LY20B070001)
NETL
NSTL
万方数据