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Step 1, pretreatment at 400 °C in pure O2; step 2, reduction in 1000 ppm of NO/1000 ppm of NH3/He; step 3, oxidation in 10% O2/He; step 4, reaction with 1000 ppm of NH3/He or step 4′, with 1000 ppm of NO/He. Total gas flow: 100 mL/min for XAS, 50 mL/min for UV-Vis. The purge step was carried out in He for XAS and in N2 for UV-Vis.
