Highly active copper-intercalated weakly crystallized δ-MnO_(2) for low-temperature oxidation of CO in dry and humid air  

作　　者：Hao Zhang Huinan Li Pengyi Zhang Tingxia Hu Xianjie Wang 

机构地区：[1]State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing,100084,China [2]Beijing Key Laboratory for Indoor Air Quality Evaluation and Control,Beijing,100084,China [3]Midea Corporate Research Center,Foshan,528311,China

出　　处：《Frontiers of Environmental Science & Engineering》2024年第5期127-136,共10页环境科学与工程前沿（英文）

基　　金：financially supported by the National Natural Science Foundation of China(No.22076094);the Science&Technology Innovation Program of Shunde of Foshan City(China)(No.2130218002526);and the Tsinghua-Foshan Innovation Special Fund(China)(No.2021THFS0503).

摘　　要：Copper intercalated birnessite MnO_(2)(δ-MnO_(2))with weak crystallinity and high specific surface area(421 m^(2)/g)was synthesized by a one-pot redox method and investigated for low-temperature CO oxidation.The molar ratio of Cu/Mn was as high as 0.37,which greatly weakened the Mn-O bond and created a lot of low-temperature active oxygen species.In situ DRIFTS revealed strong bonding of copper ions with CO.As-synthesized MnO_(2)-150Cu achieved 100%conversion of 250 ppm CO in normal air(3.1 ppm H_(2)O)even at−10°C under the weight-hourly space velocity(WHSV)of 150 L/(g·h).In addition,it showed high oxygen storage capacity to oxidize CO in inert atmosphere.Though the concurrent moisture in air significantly inhibited CO adsorption and its conversion at ambient temperature,MnO_(2)-150Cu could stably convert CO in 1.3%moisture air at 70°C owing to its great low-temperature activity and reduced competitive adsorption of water with increased temperature.This study discovers the excellent low-temperature activity of weakly crystallized δ-MnO_(2) induced by high content intercalated copper ions.

关 键 词：CO oxidation BIRNESSITE Interlayer copper LOW-TEMPERATURE Oxygen storage capacity 

分 类 号：O64[理学—物理化学]