थर्मोडायनामिक्स और कैटलिसिस जर्नल

थर्मोडायनामिक्स और कैटलिसिस जर्नल
खुला एक्सेस

आईएसएसएन: 2157-7544


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 NOx 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 NOx 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 NOx conversion rate and the temperature was obtained. According to the result, it is found that the NOx 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 NOx 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.