Effect of oxygen concentration on the NOx reduction with ammonia over V2O5–WO3/TiO2 catalyst
2006
Abstract The catalytic reduction of NO x in the typical operation temperatures and oxygen concentrations of diesel engines has been studied in the presence of V3W9Ti in a tubular flow reactor. The results have shown that the selective catalytic reduction is strongly affected by the oxygen concentration in low temperature range (150–275 °C). At higher temperatures, the reaction becomes independent of the O 2 concentration. The rate of the selective catalytic reduction of NO with ammonia may be considerably enhanced by converting part of the NO into NO 2 . DRIFT measurements have shown that NH 3 and NO 2 are adsorbed on the catalyst surface on the contrary of NO. The experiments have shown that the decrease in N 2 selectivity of the SCR reaction is mainly due to the SCO of ammonia and to the formation of nitrous oxide.
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