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The NOx conversion properties of Mn-Cu-TiO2 and V2O5/TiO2 catalysts were studied for the selective catalytic reduction (SCR) of NOx with ammonia. The performance of the catalysts was investigated in terms of their NOx conversion activity as a function of the reaction temperature and space velocity. The activity of the Mn-Cu-TiO2 catalyst decreased with increasing reaction temperature and space velocity. However, the activity of the V2O5/TiO2 catalyst increased with increasing reaction temperature. High activity of the Mn-Cu-TiO2 catalyst was observed at temperatures below 200°C. H2-TPR and XPS analyses were conducted to explain these results. It was found that the activity of the Mn-Cu-TiO2 catalyst was influenced by the thermal shock caused by the change of the initial reaction temperature, whereas the V2O5/TiO2 catalyst was not affected by the initial reaction temperature. In the case of catalyst C, the NOx conversion efficiency decreased with increasing space velocity. The decrease in the NOx conversion efficiency with increasing space velocity was much less for catalyst D than for catalyst C.

NOxremoval of Mn-Cu-TiO2and V/TiO2catalysts for the reaction conditions

NO_xremoval of Mn-Cu-TiO₂and V/TiO₂catalysts for the reaction conditions