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《Diesel Engine》 2019-05
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Impact of Different Si/Al on NH_3-SCR Performance and Low-Temperature Hydrothermal Aging Stability of Cu-SAPO-34

Wang Hang;Jiang Han;Lin He;Guan Bin;Huang Zhen;Shanghai JiaoTong University;  
A series of Cu-SAPO-34 differed in Si/Al were synthesized using the new method called one-pot. Different Si/Al include 0.3,0.4,0.5,0.6,0.7,0.8, and the condition of aging is 70 ℃,10%H_2O,16 h. Then the NO_x conversion and N_2 selectivity of both fresh and aged samples were tested, and these samples were characterized through BET, XRD, H_2-TPR and NH_3-TPD. The results show that the Cu-SAPO-34 with 0.4 Si/Al has best NH_3-SCR performance and low-temperature hydrothermal aging stability. The characterized results of XRD, H_2-TPR, NH_3-TPD show that the Cu-SAPO-34 with 0.4 Si/Al reaches a great level in structure, characteristics and distribution of Cu ions, as well as acid sites. So the conclusion is that the key of achieving great NH_3-SCR performance and low-temperature hydrothermal aging stability of Cu-SAPO-34 is to keep Si/Al relatively low during synthesization.
【Fund】: 国家自然科学基金(51306115)
【CateGory Index】: TQ426;X701
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