In this study, NH₃-SCR experiment using W/Ce/TiO₂ was performed. The reaction activity of W/TiO2 decreased sharply at the temperature below 450℃. In order to overcome this problem, it was confirmed that the reaction activity was enhanced by addition of Cerium. It was confirmed that the reaction activity varies depending on the added position and amount of Cerium. In the temperature range of 350~550℃, the catalytic activity of W [13]/Ce [10]/TiO₂(A) catalyst supported on Tunsten in Ce [10]/TiO₂(A) was found to be about 20% higher than that of Ce [10]/W [13]/TiO₂(A) supported on Cerium in W [13]/TiO₂(A). When H2-TPR and Raman analysis were performed, W [13]/Ce [10]/TiO₂(A) could not identify crystalline CeO₂ and Bulk CeO₂ by forming W-O-Ce bond. On the other hand, it was confirmed that Ce [10]/ W [13]/TiO₂(A) formed Crystalline CeO₂ and Bulk CeO₂. When the reaction activity was compared by varying the Cerium content, W [13]/Ce [4]/TiO₂(A) with 4 wt.% Cerium content showed excellent activity over 82% in temperature range of 350~550℃. when W [13]/Ce [4]/TiO₂ catalysts were prepared using commercially TiO₂ with various physicochemical properties and the correlation between the reaction activity and the physicochemical properties were compared, it was confirmed that the larger the BET and the smaller the average pore diameter, the better the reaction activity. Finally, a comparison of the reaction activity in various operating conditions (Space velocity: 60,000~180,000h-1, Oxygen concentration: 3~15%, NH₃/NOx ratio: 0.6~1.2) and the thermal durability of the W [13]/Ce [4]/TiO₂(A) catalyst were carried out. When W [13]/Ce [10]/TiO₂(A) catalyst was heat treated at 550℃ for 600 hours, it was judged to have thermal durability because it maintained the initial reaction activity.
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