The behaviour of a V2O5WO3TiO2phosphorated catalyst, in the Selective Catalytic Reduction (SCR) of equimolar NO + NO2mixtures, is studied in order to analyse the possibility of its industrial utilization for the treatment of nitric-acid plant stack gases. With this new catalyst, an NOxconversion higher than 90% molar can be achieved, the ammonia concentration at the exit gas being lower than that required to form ammonium salts, throughout the temperature range of commercial interest: 250-450°C, at a relatively high space velocity (GHSV ≤ 40000 h-1NC). The effect of several operating variables such as oxygen concentration and NO2/NO molar ratio in the feed is also discussed. © 1993.
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