• 关键词：环境水  FeMnO₃  NiMnO₃  甲醛氧化  室温  反应机理

• 基金项目：国家自然科学基金（No.21777175）

• 潘菊霜
• 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;中国科学院大学，北京 100049

• 麻春艳
• 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

• 宋茂勇
• 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

• 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FeMnO₃和NiMnO₃催化剂，研究了不同湿度条件（RH=0、40%、65%和90%）对 FeMnO₃和NiMnO₃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，FeMnO₃和NiMnO₃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CO₂和H₂O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.

• Abstract：It is of practical value to design and synthesize moisture-tolerance manganese composite oxide catalysts for formaldehyde oxidation due to the effect of H₂O on catalytic performance. FeMnO₃ and NiMnO₃ catalysts were synthesized by co-precipitation method. The effects of relative humidity （RH） on the catalytic activity and stability of formaldehyde oxidation over FeMnO₃ and NiMnO₃ 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 FeMnO₃ and NiMnO₃ catalysts is more than 15%at 10 h. The content of high-valence metals （Fe³⁺ and Ni³⁺） and surface oxygen species on the catalyst surface increased at RH of 40%. Carbonate is the primary intermediate and can be easily decomposed into CO₂ and H₂O 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 H₂O on formaldehyde oxidation mechanism.

• Key words：H₂O  FeMnO₃  NiMnO₃  formaldehyde oxidation  room temperature  reaction mechanism

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