In situ DRIFTS experiments were performed on a Fourier transform infrared (FTIR) spectrometer (Nicolet Nexus 670) equipped with a Smart Collector and an MCT/A detector cooled by liquid nitrogen. The reaction temperature was controlled precisely by an Omega programmable temperature controller. Before each experiment, the sample was pretreated at 300°C for 0.5 hours in a flow of 20 vol % O2/N2 and then cooled down to 150 or 250°C. The background spectra were collected in flowing N2 and automatically subtracted from the sample spectrum. The reaction conditions were controlled as follows: total flow rate (300 ml min−1), 500 ppm NH3 and/or 500 ppm NO, 5 vol % O2, and N2 balance. All spectra were recorded by accumulating 100 scans with a resolution of 4 cm−1.

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