首页|Quantitative discrimination of surface adsorbed NOx species on CeO2 via spectrophotometry for SCR denitration investigation

Quantitative discrimination of surface adsorbed NOx species on CeO2 via spectrophotometry for SCR denitration investigation

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CeO2-based catalysts are widely investigated for selective catalytic reduction(SCR)of NO with NH3.Interaction of NO/O2 with CeO2 generally produces two surface species,i.e.,nitrates and nitrites.How-ever,the explicit quantification of these two species is still unresolved.Herein,we reported that spec-trophotometry characterization was effective in determining surface adsorbed NOx species on CeO2 by measuring the corresponding ions(NO2 and NO3)dissolved in aqueous solution.Experimental results show that both nitrate(-NO3)and nitrite(-NO2)species can be quantitatively evaluated and the ac-curacy is verified by calibrating with NOx-TPD result.Exclusive transfer of adsorbed NOx from catalyst surface to aqueous solution is confirmed and the dissolution process can be accelerated by ultrasonic treatment.Moreover,useful information related to evolution of surface NOx species under various conditions(O2 treatment,different adsorption temperature and duration)and over different catalysts(Fe2O3,MnO2 and MnOx-CeO2)are provided.The result of present study demonstrates the potential of spectrophotometry for quantitative discrimination of surface NOx species on CeO2 and other oxide-based materials,which is conducive to mechanism analysis of SCR reaction.

Quantitative evaluationSpectrophotometry analysisNitrate speciesNitrite speciesCeO2 catalystNH3-SCR

Songil Sin、Jiawei Ji、Lijun Cheng、Zhiwen Gu、Chong Tan、Kwangchol Ri、Changjin Tang

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School of Environment,Nanjing Normal University,Nanjing,210023,China

Department of Mining Engineering,Kim Chaek University of Technology,Pyongyang,999093,Democratic People's Republic of Korea

Laboratory of Mesoscopic Chemistry of MOE,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing,210023,China

Institute of Chemical Engineering,Hamhung University of Chemical Engineering,Hamhung,Democratic People's Republic of Korea

Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology,Nanjing,210023,China

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国家自然科学基金国家自然科学基金Major Scientific and Technological Project of Bingtuan

22276097219760812018AA002

2024

10.1016/j.jre.2023.03.021

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(6)
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