Study on the Application of CuO/Al_2O_3 Cordierite Ceramic Honeycomb Catalyst in Cleaning the Flue Gas for NO_x

摘要

This paper introduces the current research status of denitration catalysts used in Selective Catalytic Reduction (SCR) technology, and assess the effects of a composite catalyst on the denitration performance of flue gas. Laboratory experiments were conducted to prepare a new composite catalyst, that is, CuO loaded on a honeycomb cordierite ceramic catalyst carrier with Al_2O_3 coating by the equivalent volume impregnation method. The orthogonal designed tests were used to study the effects on denitration performance caused by the changes of Al_2O_3 loading, calcination temperature and calcination time, obtain the optimum condition for the catalyst carrier preparation with the best denitration rate. Then the effects of CuO loading, calcination temperature and calcination time on denitration rate of the new composite catalyst were investigated. Results showed that: (1) As for catalyst carrier, significance of three factors that had effects on the flue gas denitration rate was in a sequence: loading of Al_2O_3 ＞ calcination temperature ＞ calcination time. (2) Calcined at 600℃ for 4 hours with 3% of Al_2O_3 loading was the condition to prepare the composite carrier with the best denitration rate. (3) For the new composite catalyst, three noticeable increased-then-decreased trends of denitration rate change were presented with the increasing CuO loading, calcination temperature and calcination time. (4) Calcined at 450℃ for 4 hours with 8% CuO loading was the condition to prepare the new composite catalyst with the best denitration rate.