首页|Investigation on the redox/acidic features of bimetallic MOF-derived CeMOx catalysts for low-temperature NH3-SCR of NOx
Investigation on the redox/acidic features of bimetallic MOF-derived CeMOx catalysts for low-temperature NH3-SCR of NOx
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Low-temperature selective catalytic reduction with NH3(LT-SCR)is a promising approach for NOx remediation.This work utilized bimetallic metal-organic frameworks(MOFs)to prepare CeMOx(M=Ti,Cu)catalysts allowing the homogeneous distribution of promoters to investigate LT-SCR explicitly.The strong interfacial interaction between nanoscale-mixed components was characterized on CeTiOx by HRTEM,micro-Raman,and XPS,resulting in high acidity and good redox properties with abundant Ce~(3+)and Ti~(4+).It obtained over 80% conversion from 180 ℃ to 300 ℃ with 100% N2 selectivity,and maintained stable performance in SO2/H2O at a high GHSV of 150,000 L~(-1).In situ DRIFTS reveals that NH3 adsorption was promoted on CeTiOx,which accelerated reaction between NOx and adsorbed NH3 via Eley-Rideal mechanism.Meanwhile,the aliovalent substitution of ceria by Cu~(2+)was observed on CeCuOx,forming oxygen vacancies.Its high redox properties enhanced NOx conversion by Langmuir-Hinshelwood mechanism,but triggered NH3 peroxidation,leading to poor N2 selectivity.
Bimetallic oxidesLow-temperature NH3-SCR of NOxSurface acidityRedox propertySO2 resistance
Qimin Zhou、Kailin He、Xiaoxiang Wang
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Institute of Zhejiang University-Quzhou,99 Zheda Rd,Quzhou 324000,Zhejiang,P.R.China
National Sintering and Pelletizing Equipment System Engineering Research Center,Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,Hunan,P.R.China
College of Chemical and Biological Engineering,Zhejiang University,38 Zheda Rd,Hangzhou 310007,Zhejiang,P.R.China
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