Journal
MOLECULAR CATALYSIS
Volume 495, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mcat.2020.111152
Keywords
MnOX and CeO2; Co-precipitation; Impregnation; o-DCB; NH3-SCR
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Funding
- MINECO/FEDER [CTQ2015-64616-P, BES-2016-077849]
- Basque Government [IT657-13, IT1297-19]
- University of the Basque Country UPV/EHU [INF12/37, UFI 11/39]
- European funding (ERDF)
- European funding (ESF)
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Two series of catalysts based on Mn and Ce oxides were prepared by co-precipitation and impregnation, in order to study their physicochemical properties and catalytic performance in the simultaneous reduction of NO and oxidation of o-DCB. Co-precipitation catalysts showed better activity than those prepared by impregnation because of the formation of a MnOX-CeO2 solid solution, which improves redox and acid properties. Moreover, the catalysts with MnOX content between 80 and 90 mol.%, in which a coexistence between solid solution phase and Mn2O3 crystal was found, presented NO conversion above 90 % at temperatures below 250 degrees C and o-DCB conversion above 80 % at temperatures above 200 degrees C. The main by-products of SCR were N2O, produced in the whole range of temperature, and NO2, formed at temperatures above 300 degrees C. Selectivity to CO2 above 80 % was obtained using co-precipitation catalysts in all temperature range. Deactivation experiments showed that oxidation reaction strongly contributes to deactivate impregnation catalysts, whereas the effect of deactivation is lower in co-precipitation catalysts at high Mn contents.
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