A series of cerium-tungsten oxide catalysts was prepared by the co-precipitation method and was evaluated for the selective catalytic reduction of NO x by ammonia (NH 3 -SCR) over a wide temperature range. These catalysts were characterized by BET, XRD, XPS and H 2 -TPR analyses. The experimental studies demonstrated that, among cerium-tungsten oxides, CeO 2 -WO 3 with a Ce/W molar ratio of 3/2 exhibited the best activity toward NH 3 -SCR reactions, N 2 selectivity and SO 2 durability over a broad temperature range of 175-500°C at a space velocity of 47,000 h -1 . The strong interaction between Ce and W could be the main factor leading to the high activity of the CeO 2 -WO 3 mixed oxide catalyst.
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