摘要
In order to deal with the challenge of the hydrothermal deactivation of selective catalytic reduction of NO by NH3(NH3-SCR)catalyst and extend its lifetime,a novel Cu/SAPO-5/34 catalyst was prepared,and it almostmaintains its deNOx performance with a high conversion rate of 90%NO,between 175℃and 400℃after under-going the rigorous treatment at 800℃for 12 h.Thus,Cu/SAPO-5/34 is more recalcitrant to the high-temperature hydrothermal deactivation than Cu/SAPO-34.Besides,the formation of N20 is always below 3×10^-6(3 ppm)during the whole reaction temperature.performing an advanced catalytic selectivity.The effect of high-temperature hvdro-thermal treatment on the morphology,structure and texture property,the acid sites,as well as the active copper spe cies were investigated.These characterizations manifest that the optimized high-temperature hydrothermal stability is associated closely with the good structural stability over Cu/SAPO-5/34-HT.which facilitates to preserve reaction sites,and then showing the better hydrothermal stability than Cu/SAPO-34.
基金
Supported by the National Natural Science Foundation of China(No.21802099)
the Science and Technology Program of Sichuan Province,China(Nos 2019YFS0498,2018GZ0401).
