Highly active copper-intercalated weakly crystallizedδ-Mn02 for low-temperature oxidation of CO in dry and humid air

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外文摘要：Copper intercalated bimessite MnO2(δ-MnO2)with weak crystallinity and high specific surface area(421 m2/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 MnO2-150Cu achieved 100％conversion of 250 ppm CO in normal air(3.1 ppm H2O)even at-10 ℃ 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,MnO2-150Cu could stably convert CO in 1.3％moisture air at 70 ℃ 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 crystallizedδ-MnO2 induced by high content intercalated copper ions.

外文关键词：

CO oxidationBimessiteInterlayer copperLow-temperatureOxygen storage capacity

作者：

Hao Zhang、Huinan Li、Pengyi Zhang、Tingxia Hu、Xianjie Wang

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作者单位：

State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China

Beijing Key Laboratory for Indoor Air Quality Evaluation and Control,Beijing 100084,China

Midea Corporate Research Center,Foshan 528311,China

基金：

National Natural Science Foundation of ChinaScience &Technology Innovation Program of Shunde of Foshan City(China)Tsinghua-Foshan Innovation Special Fund(China)

项目编号：

2207609421302180025262021THFS0503

出版年：

2024

DOI：

10.1007/s11783-024-1822-5

环境科学与工程前沿

高等教育出版社

环境科学与工程前沿

影响因子：0.545

ISSN：2095-2201

年,卷(期)：2024.18(5)