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| IThe selective catalytic reduction of nitric oxide with hydrogen is studied using TiO2 supported metal clusters (Pt, Ir, Ni) as novel catalysts at the reaction temperatures between 80 and 255 oC. The activity and selectivity of metal/TiO2 catalysts are found to be dependent on the nature of surface function groups formed, which are monitored by in situ diffuse reflectance infrared Fourier transform spectroscopy. Several kinds of adsorbed NOx species have been observed on catalysts under NO-H2-O2 reaction conditions, which should be responsible for different reaction products (N2O, N2 and NO2). Base on the catalytic performances and in situ DRIFTS results, a general mechanism for NO-H2-O2 reaction on metal/TiO2 catalysts is proposed. |
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| Keywords:Physical Chemistry; NO selective reduction; Hydrogen; Metal/TiO2; Mechanism; DRIFTS |
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