FT-IR spectroscopic investigation of the surface reaction of CH4 with NOx species adsorbed on Pd/WO3–ZrO2 catalyst
Date
2007
Authors
Kantcheva, M.
Cayirtepe, I.
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Source Title
Catalysis Letters
Print ISSN
1011-372X
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Volume
115
Issue
3-4
Pages
148 - 162
Language
English
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Abstract
The interaction of methane at various temperatures with NO x species formed by room temperature adsorption of NO + O2 mixture on tungstated zirconia (18.6 wt.% WO3) and palladium(II)-promoted tungstated zirconia (0.1 wt.% Pd) has been investigated using in situ FT-IR spectroscopy. A mechanism for the reduction of NO over the Pd-promoted tungstated zirconia is proposed, which involves a step consisting of thermal decomposition of the nitromethane to adsorbed NO and formates through the intermediacy of cis-methyl nitrite. The HCOO- formed acts as a reductant of the adsorbed NO producing nitrogen. © Springer Science+Business Media, LLC 2007.
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Keywords
CH4 - SCR , Cis-methyl nitrite , Decomposition of nitromethane , In situ FT - IR , Mechanism , Pd2+/WO 3-ZrO2 , Reactivity toward CH4 , Surface NO x complexes , WO3/ZrO2 , Catalyst activity , Fourier transform infrared spectroscopy , Nitrogen oxides , Pyrolysis , Surface reactions , Zirconia , Nitromethane , Methane