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Catalytic performance and SO2 tolerance of tetragonal-zirconia-based catalysts for low-temperature selective catalytic reduction

Published online by Cambridge University Press:  15 August 2016

Rong Liu*
Affiliation:
Jangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, China; School of Environment, Nanjing Normal University, Nanjing, China; and Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Controlling, Nanjing Normal University, Nanjing, China
Lingchen Ji
Affiliation:
Jangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, China; School of Environment, Nanjing Normal University, Nanjing, China; and Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Controlling, Nanjing Normal University, Nanjing, China
Yifan Xu
Affiliation:
Jangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, China; School of Environment, Nanjing Normal University, Nanjing, China; and Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Controlling, Nanjing Normal University, Nanjing, China
Fei Ye
Affiliation:
Jangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, China; School of Environment, Nanjing Normal University, Nanjing, China; and Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Controlling, Nanjing Normal University, Nanjing, China
Feng Jia
Affiliation:
School of Environment, Nanjing Normal University, Nanjing, China; and Nanoparticle and Air Quality Laboratory, Institute of Environmental Engineering, National Chiao Tung University, Taiwan, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

MnOx –CeO2/t-ZrO2 catalyst was prepared by impregnation of nanotetragonal zirconia. The NO conversion of 5 wt% MnOx –CeO2/t-ZrO2 catalyst was 68.1% at 100 °C while that of 30 wt% MnOx –CeO2/t-ZrO2 catalyst was 97.4%. The x-ray diffraction, Brunner–Emmet–Teller measurements (BET), and H2-TPR showed surface properties of the prepared catalysts were good for selective catalytic reduction reactions. X-ray photoelectron spectroscopy analysis indicated that Mn4+ and Ce4+ oxidation states were predominant on the surface of the catalyst and so was lattice oxygen which was conducive to Lewis acid sites. NH3-TPD test results demonstrated that Lewis acid sites are predominant on the surface of catalyst. The presence of SO2 reduced the catalyst activity. The realized conversion dramatically decreased to 47% from nearly 100% after 8 h. Characterization of fresh and spent catalysts indicated the deterioration of active component and deposition of NH4HSO4 or (NH4)2SO4 contribute to SO2 poisoning.

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Articles
Copyright
Copyright © Materials Research Society 2016 

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