FT-IR spectroscopic investigation of the surface reaction of CH4 with NO
x
species adsorbed on Pd/WO3–ZrO2 catalyst |
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| Authors: | Margarita Kantcheva Ilknur Cayirtepe |
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| Affiliation: | (1) Department of Chemistry, Bilkent University, 06800 Bilkent, Ankara, Turkey |
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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. |
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| Keywords: | in situ FT-IR WO3/ZrO2 Pd2+/WO3– ZrO2 surface NO x complexes reactivity toward CH4 CH4-SCR mechanism decomposition of nitromethane cis-methyl nitrite |
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