Abstract
This study is to investigate the effect on TiO₂ loading amounts to improve the durability of thermal aging and coking of commercial chabasite SCR catalysts. The 4. Cu-SCR+7wt%TiO₂ catalyst showed the highest NOx conversion rate of 61% on average in the entire temperature range of 200~50 0℃. The Cu-SCR catalysts containing on 2, 5, and 7wt%TiO₂ compared to fresh Cu-SCR catalyst decreased NOx conversion rate to -19%, -19% and -20% under thermal aging conditions at 850℃ for 24 hours. The de-NOx performance of the Cu-SCR+2wt%TiO₂ catalyst was improved. The promoter TiO₂ is acidic and has improved durability against carbon poisoning caused by oxidation of C₃HSUB6/SUB. 2. Cu-SCR+2wt%TiO₂ was improved the de-NOx performance than other catalysts under the coking condition of 16.5 g/L C. When considering the evaluation of the thermal aging and durability against coking of the Cu-SCR commercial catalysts, the proper amounts of TiO₂ was 2wt%.
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