Selective reduction of NO X in diesel exhaust with hydrocarbons over alumina in NEDC conditions

The selective catalytic reduction (SCR) of NO X assisted by hydrocarbons was investigated on alumina in New European Driving Cycle (NEDC) conditions. The alumina efficiency towards the deNO X process was shown in the temperature range 200–400 °C involving a three-catalytic cycle mechanism. However, many parameters influence the catalytic activity: temperature, HC/NO X ratio and GHSV.