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Study on MnOx–FeOy composite oxide catalysts prepared by supercritical antisolvent process for low-temperature selective catalytic reduction of NOx

Published online by Cambridge University Press:  07 March 2016

Haoxi Jiang ,
Lu Zhang ,
Jing Zhao ,
Yonghui Li  and
Minhua Zhang
Haoxi Jiang
Affiliation:
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
Lu Zhang
Affiliation:
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
Jing Zhao
Affiliation:
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
Yonghui Li*
Affiliation:
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
Minhua Zhang
Affiliation:
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
*
a)Address all correspondence to this author. e-mail: Liyh@tju.edu.cn
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Abstract

In this study, the MnOx–FeOy hollow nanospheres with solid solution structure were prepared by supercritical antisolvent (SAS) process. The average particle size was about 50 nm, and average pore diameter was 7 nm. By applying the SAS method, novel nonsupported MnOx–FeOy catalysts with a Mn/Fe mass ratio of 1:1 showed rather high selective catalytic reduction activity and broad active temperature window. The NOx conversion rate reached 97% at 220 °C, and maintained above 92% from 180 to 260 °C. The experiment results showed that iron doping could cause the apparent change of MnOx morphology and structure, which enhanced the oxidative ability of manganese species and increased surface active oxygen species. Meanwhile, compared with traditional methods, the SAS process could efficiently enhance the interaction between manganese and iron, and produce smaller size and larger pore volume nanoparticles with more active sites on the surface.

Keywords

catalyticnanostructureenvironmentally protective
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 6 , 28 March 2016 , pp. 702 - 712
Copyright
Copyright © Materials Research Society 2016 

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