Granular CuO-CeO2-MnOx/γ-Al2O3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO2-MnOx/γ-Al2O3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed system. ...Granular CuO-CeO2-MnOx/γ-Al2O3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO2-MnOx/γ-Al2O3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed system. Preliminary tests were carried out to analyze the behavior of NH3 and NO over catalyst in the presence of oxygen. The optimum temperature range for SCR over the CuO-CeO2-MnOx/γ-Al2O3 catalysts is 300-400 ℃ . The catalysts maintain nearly 100% NO conversion at 350 ℃. The NH3 oxidation experiments show that both NO and N2O are produced gradually with the increase of temperature. The catalysts in this experiment have a stronger oxidation property on NH3, which improves the denitrification activity at low temperature. The over-oxidation of NH3 at high temperature is the main cause leading to a decrease in the NO conversion. The NH3 and NO desorption experiments show that NH3 and NO can be adsorbed on CuO-CeO2-MnOx/γ-Al2O3 granular catalysts. The transient response of NH3 and NO indicates that the SCR reaction proceeds in accordance with the Eley-Rideal mechanism. The adsorbed NO has little influence on the denitrification activity in SCR process.展开更多
In this work,a kinetic study of the selective catalytic reduction of NO with NH3 has been carried out.After proving the operating condition that the effect of intraphase diffusion and interphase mass-transfer processe...In this work,a kinetic study of the selective catalytic reduction of NO with NH3 has been carried out.After proving the operating condition that the effect of intraphase diffusion and interphase mass-transfer processes can be ignored,the selective catalytic reduction of NO with NH3 on the catalytic activity of V2O5-WO3/TiO2 has been carried out with fixing the feed gas flow rate and composition（NO,NH3,O2） while varying the catalyst loading.Based on the experimental results of NO removal efficiency,the empirical catalytic reaction rate equation of NO with NH3 has been obtained using differential analysis.The experimental result is further proved by the graphic integral method at the temperature from 320℃ to 400℃.The reaction order is 1 to NO and zero to NH3.The reaction follows the Eley-Rideal mechanism model.展开更多
基金Projects (50776037,50721005) supported by the National Natural Science Foundation of China
文摘Granular CuO-CeO2-MnOx/γ-Al2O3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO2-MnOx/γ-Al2O3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed system. Preliminary tests were carried out to analyze the behavior of NH3 and NO over catalyst in the presence of oxygen. The optimum temperature range for SCR over the CuO-CeO2-MnOx/γ-Al2O3 catalysts is 300-400 ℃ . The catalysts maintain nearly 100% NO conversion at 350 ℃. The NH3 oxidation experiments show that both NO and N2O are produced gradually with the increase of temperature. The catalysts in this experiment have a stronger oxidation property on NH3, which improves the denitrification activity at low temperature. The over-oxidation of NH3 at high temperature is the main cause leading to a decrease in the NO conversion. The NH3 and NO desorption experiments show that NH3 and NO can be adsorbed on CuO-CeO2-MnOx/γ-Al2O3 granular catalysts. The transient response of NH3 and NO indicates that the SCR reaction proceeds in accordance with the Eley-Rideal mechanism. The adsorbed NO has little influence on the denitrification activity in SCR process.
文摘In this work,a kinetic study of the selective catalytic reduction of NO with NH3 has been carried out.After proving the operating condition that the effect of intraphase diffusion and interphase mass-transfer processes can be ignored,the selective catalytic reduction of NO with NH3 on the catalytic activity of V2O5-WO3/TiO2 has been carried out with fixing the feed gas flow rate and composition（NO,NH3,O2） while varying the catalyst loading.Based on the experimental results of NO removal efficiency,the empirical catalytic reaction rate equation of NO with NH3 has been obtained using differential analysis.The experimental result is further proved by the graphic integral method at the temperature from 320℃ to 400℃.The reaction order is 1 to NO and zero to NH3.The reaction follows the Eley-Rideal mechanism model.
