Selective catalytic reduction of N2O with CH4 on Ni-MOR: a comparison with Co-MOR and Fe-MOR catalysts (Articolo in rivista)

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  • Selective catalytic reduction of N2O with CH4 on Ni-MOR: a comparison with Co-MOR and Fe-MOR catalysts (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.cattod.2013.09.014 (literal)
Alternative label
  • Daniela Pietrogiacomi, Maria Cristina Campa, Manlio Occhiuzzi (2014)
    Selective catalytic reduction of N2O with CH4 on Ni-MOR: a comparison with Co-MOR and Fe-MOR catalysts
    in Catalysis Today; Elsevier, Amsterdam (Paesi Bassi)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Daniela Pietrogiacomi, Maria Cristina Campa, Manlio Occhiuzzi (literal)
Pagina inizio
  • 116 (literal)
Pagina fine
  • 122 (literal)
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  • 227 (literal)
Rivista
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  • 7 (literal)
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  • a)Dipartimento di Chimica, \"Sapienza\", Università di Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy b) Istituto per lo Studio dei Materiali Nanostrutturati-CNR, c/o Dipartimento di Chimica, \"Sapienza\", Università di Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy (literal)
Titolo
  • Selective catalytic reduction of N2O with CH4 on Ni-MOR: a comparison with Co-MOR and Fe-MOR catalysts (literal)
Abstract
  • The selective catalytic reduction of N2O with CH4 in the presence of excess O2 (CH4-SCRN2O) and CH4 + O2 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 Brønsted 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 + O2. Using a methane-rich mixture, CH4-SCRN2O consisted of a CH4 + N2O + O2 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 + O2 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 Fe-MOR 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. (literal)
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