Magnesium doping to improve the light to heat conversion of OMS-2 for formaldehyde oxidation under visible light irradiation  

作　　者：Tingting Liu Pengfei Sun Wei Zhao Yingshuang Li Lujun Cheng Jiahai Fan Xiaohui Bi Xiaoping Dong 

机构地区：[1]College of Chemistry and Chemical Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China [2]College of Environmental Science and Engineering,Nankai University,Tianjin 300071,China [3]Hangzhou Kaiming Catalyst Co.,Ltd.,Hangzhou 310013,China

出　　处：《Chinese Chemical Letters》2024年第4期193-198,共6页中国化学快报（英文版）

基　　金：financially supported from the Natural Science Foundation of China(No.51908491);the Ministry of Science and Technology Project of China(No.2017YFE0127400);the Zhejiang Provincial Natural Science Foundation of China(No.LY20B070001)。

摘　　要：Mg-doped manganese oxide octahedral molecular sieve(Mg-OMS-2)catalysts were prepared by hydrothermal 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 oxygen and oxygen vacancy that formed by lattice distortion via Mg-doped were activated.The best HCHO elimination efficiency was achieved over Mg_(0.2)/OMS-2 catalyst with Mg^(2+)/Mn^(2+)=1/5,which could reduce 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·O^(2-) to generate formate species and carbonate species,and finally transformed to CO_(2) and H_(2)O.This photothermal catalytic oxidation process exhibited a high efficiency purification of HCHO without the help of extra energy consumption.

关 键 词：Mg doping Photothermal catalysis OMS-2 HCHO Reaction mechanism 

分 类 号：O643.36[理学—物理化学] X701[理学—化学]