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. 2018 Nov 30;4(11):eaau4637. doi: 10.1126/sciadv.aau4637

Fig. 1. Catalytic activity and catalyst characterization.

Fig. 1

(A) NOx conversion as a function of temperature in the feed gas of 500 parts per million (ppm) NO/500 ppm NH3/5.0 vol % O2/N2 (200,000 hour−1). (B) NH3-TPD of vanadia-based catalysts after 1% NH3/N2 adsorption at 50°C for 1 hour, followed by Ar purging. a.u., arbitrary units. (C and D) In situ DRIFTS of NO + O2 adsorption on 1V/Ti and 1V/9STi catalysts pretreated with NH3 at 150°C with the NH3-adsorbed samples as background. (E) Raman results of vanadia-based catalysts under an oxygen flow at 400°C.