环境水对FeMnO_(3)和NiMnO_(3)室温催化氧化甲醛的影响  

Effect of H2O on formaldehyde oxidation over FeMnO_(3) and NiMnO_(3) at room temperature

作　　者：潘菊霜 麻春艳[1] 宋茂勇[1] PAN Jushuang;MA Chunyan;SONG Maoyong(Key Laboratory of Environmental Nanotechnology and Health Effects,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院生态环境研究中心,环境纳米技术与健康效应重点实验室,北京100085 [2]中国科学院大学,北京100049

出　　处：《环境科学学报》2022年第6期346-356,共11页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.21777175)。

摘　　要：环境水会影响催化剂的性能,设计合成耐湿的锰复合氧化物催化剂用于甲醛氧化具有重要实用意义.采用共沉淀法合成了FeMnO_(3)和NiMnO_(3)催化剂,研究了不同湿度条件(RH=0、40%、65%和90%)对FeMnO_(3)和NiMnO_(3)催化剂室温催化氧化甲醛活性及稳定性的影响.结果表明,在相对湿度为40%和65%时,水的加入在催化剂表面形成缔结吸附水,提高了甲醛室温催化氧化的转化率.在反应10 h后,FeMnO_(3)和NiMnO_(3)催化剂上甲醛的转化率都大于15%.在相对湿度为40%时,水的加入有利于增加催化剂表面高价态Fe和Ni金属及表面氧物种含量,并且有利于生成易于分解成CO_(2)和H_(2)O的碳酸盐中间物种.该研究可为制备甲醛催化氧化的耐湿催化剂提供参考及加深人们对环境水影响下甲醛催化氧化机理的理解.It is of practical value to design and synthesize moisture-tolerance manganese composite oxide catalysts for formaldehyde oxidation due to the effect of H_(2)O on catalytic performance.FeMnO_(3) and NiMnO_(3) catalysts were synthesized by co-precipitation method.The effects of relative humidity(RH)on the catalytic activity and stability of formaldehyde oxidation over FeMnO_(3) and NiMnO_(3) catalysts at room temperature were studied,including RH=0,40%,65%and 90%.It has been shown that associatively adsorption water on the catalyst surface enhanced the conversion of formaldehyde at room temperature under RH of 40%and 65%.The conversion of formaldehyde on both FeMnO_(3) and NiMnO_(3) catalysts is more than 15%at 10 h.The content of high-valence metals(Fe^(3+)and Ni^(3+))and surface oxygen species on the catalyst surface increased at RH of 40%.Carbonate is the primary intermediate and can be easily decomposed into CO_(2) and H_(2)O at RH of 40%.This study can provide a moisture-tolerant catalyst for formaldehyde oxidation at room temperature and deepen people's understanding of the effect of H_(2)O on formaldehyde oxidation mechanism.

关 键 词：环境水 FeMnO_(3) NiMnO_(3) 甲醛氧化 室温 反应机理 

分 类 号：X701[环境科学与工程—环境工程] O643.3[理学—物理化学]