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Study on the Effect of Different Preparation Methods on the Performance of AgCl/Al2O3 Catalyst Used for Diesel Exhaust Treatment

Yi-Min Yu, Susumu Sato, Wei-Min Zhou3, Hao Tian, Dong-Ying Ju*

In this study, AgCl/Al₂O₃ catalyst was prepared by the impregnation method to remove NO_x in diesel exhaust gas, so as to achieve the purpose of purifying exhaust gas. The AgCl/Al₂O₃ catalyst is a kind of hydrocarbons selective catalytic reduction (HC-SCR) catalyst. The HC-SCR catalyst uses the unsaturated hydrocarbons and the oxygencontaining derivatives of the hydrocarbons as reducing agents to convert harmful NO_x in the exhaust gas into N₂. This kind of catalyst belongs to Ag type catalyst, and because of its simple preparation conditions, low cost and good catalytic activity of this catalyst, AgCl/Al₂O₃ catalyst is worth studying. in this research, the catalysts were prepared under four different conditions by changing the adding order of NH₄Cl, AgNO₃ and γ-Al₂O₃, as well as the drying and sintering times, and through the HC-SCR test that the working environment of the catalyst in diesel exhaust gas is simulated by introducing the gas into the device equipped with the catalyst and heating, then the relationship between the NO_x conversion rate and the temperature was obtained. According to the result, it is found that the NO_x removal rate of the four catalysts is close to 100% at 350°C to 400°C. The catalyst obtained by condition C and condition D maintains a high conversion rate of NO_x in a wide temperature range. At the same time, the catalyst under condition D has good reproducibility after repeated heating and cooling experiments, therefore this catalyst is considered to have good application prospects.