Abstract
This study is to investigate the promoter to improve the durability of thermal aging and coking of commercial chabasite SCR catalysts. Cu-SCR+WO₃ SCR catalyst has improved NOx conversion at low and medium temperature, and WO₃ increased the strength of acid point to speed up the reaction rate. When C₃HSUB6/SUB coexisted (C/N = 9), the de-NOx/CO performance of the Cu-SCR+TiO₂ SCR catalyst was improved by adding TiO₂ to poisoning. An appropriate amount of TiO₂ strengthened the acidity of the SCR catalyst, which improved durability against carbon poisoning. The Cu-SCR+TiO₂ SCR catalyst had a 4.7% higher NOx conversion under C₃HSUB6/SUB coexistence conditions in de-NOx performance according to 54 g/L coking and C3H6 coexistence (C/N = 9) poisoning. This deteriorated de-NOx performance by clogging the active site of the SCR catalyst when coking excessively at 54 g/L. Cu-SCR+TiO₂ SCR catalyst on which TiO₂ was loaded has improved durability against catalyst coking when C₃HSUB6/SUB coexists. It is necessary to derive an optimal loading amount in the future.
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