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Elsevier, Catalysis Today, (227), p. 116-122

DOI: 10.1016/j.cattod.2013.09.014

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Selective catalytic reduction of N2O with CH4 on Ni-MOR: A comparison with Co-MOR and Fe-MOR catalysts

Journal article published in 2014 by Daniela Pietrogiacomi ORCID, Maria Cristina Campa, Manlio Occhiuzzi
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

The selective catalytic reduction of N2O with CH4 in the presence of excess O-2 (CH4-SCRN2O) and CH4 + O-2 reaction were studied on Ni-MOR, Co-MOR and Fe-MOR, prepared from H-MOR or Na-MOR, by ionexchange or CVD. FTIR showed that transition metal ions (tmi) were well dispersed, mainly isolated with at least two coordinative vacancies. For CH4-SCRN2O, irrespective of Bronsted acid site and Na* amount, catalysts were active in the order Fe-MOR >Ni-MOR > Co-MOR. Using a methane-poor mixture, on all samples CH4-SCRN2O consisted of two nearly independent reactions: CH4 +N2O and CH4+ O-2. Using a methanerich mixture, CH4-SCRN2O consisted of a CH4+ N2O + O-2 reaction, whose stoichiometric ratios depended on the tmi. Whereas on Ni-MOR methane combustion occurred as side reaction, on Co-MOR and Fe-MOR no side reactions occurred. Accordingly, for CH4 + O-2 Co-MOR and Fe-MOR were poorly active, whereas Ni-MOR were highly active. We conclude that in CH4-SCRN2O a monoatomic oxygen form activates methane on Co-MOR and FeMOR catalysts, whereas both a monoatomic oxygen form and a molecular oxygen form activate methane on Ni-MOR. Being active for the CH4-SCRN2O and CH4-SCRNOx and forming CO only in traces, Ni-MOR are promising catalysts for the simultaneous SCR of N2O and NOx using CH4 as reducing agent. (C) 2013 Elsevier B.V. All rights reserved.