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Synthesis of MnOx–CeO2·NOx catalysts by polyvinylpyrrolidone-assisted supercritical antisolvent precipitation

Published online by Cambridge University Press:  01 August 2014

Haoxi Jiang
Affiliation:
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
Huiqin Wang
Affiliation:
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
Li Kuang
Affiliation:
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
Guiming Li*
Affiliation:
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, 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
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

A series of MnOx–CeO2 binary oxide catalysts were synthesized by polyvinylpyrrolidone -assisted supercritical antisolvent precipitation and the effects of the manganese (Mn)/cerium (Ce) molar ratio and calcination temperature on the structure and properties of MnOx–CeO2 were investigated. A solid solution was obtained at each experimental condition and the highest surface area of 107.6 m2/g was obtained at the Mn/Ce molar ratio of 3:5 and the calcination temperature of 400 °C. Low-temperature selective catalytic reduction of emissions of nitrogen oxides, namely NO, NO2, and N2O (deNOx) with ammonia (NH3) to convert them into nitrogen and water, was used as model reaction to evaluate MnOx–CeO2 catalytic performance. It is found that the activity first increased and then decreased with increasing Mn content and decreased with increasing calcination temperature. The highest catalytic activity (93.3% NO conversion and 100% N2 selectivity) was obtained at the Mn/Ce molar ratio of 1/1 and the calcination temperature of 400 °C, which was attributed to the combination of high surface area and high redox performance of the catalyst.

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Copyright
Copyright © Materials Research Society 2014 

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References

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