The temperature window of NO x consumption lies between 140 and 500°C. The 0.5 wt%Co/Al 2 O 3 catalyst exhibits a total consumption of NO x between 300 and 350°C at a space velocity of 50 000 h )1 . The presence of acetonitrile and methylnitrite can explain the difference between N 2 formation and NO x consumption at T < 400°C. The Co 2+ , in octahedral site, has been shown to coordinate two NO molecules.
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