The MnCeO_(x)catalysts were synthesized via the co-precipitation method,with calcination temperatures ranging from 300 to 850℃.The results demonstrate that MnCeO_(x)-350℃catalyst exhibits the optimal NO_(x)conversio...The MnCeO_(x)catalysts were synthesized via the co-precipitation method,with calcination temperatures ranging from 300 to 850℃.The results demonstrate that MnCeO_(x)-350℃catalyst exhibits the optimal NO_(x)conversion rate within the reaction temperature range of 175–325℃.To understand the reasons for the influence of calcination temperature on the performance of catalysts,four representative catalysts were chosen for detailed analysis:MnCeO_(x)-300℃,MnCeO_(x)-350℃,MnCeO_(x)-650℃,and MnCeO_(x)-750℃.The catalysts were characterized through various techniques including nitrogen physisorption analysis,X-ray diffraction,Raman spectroscopy,hydrogen temperature programmed reduction,ammonia temperature programmed desorption,X-ray photoelectron spectroscopy,and in situ diff use reflectance infrared Fourier transform spectroscopy experiments.In addition,we assessed the water and SO_(2)resistance of these catalysts.The results demonstrate that the reason why MnCeO_(x)-350℃has good performance is not only because of its lower crystallinity and higher specific surface area but also because the catalyst can provide more Br?nsted acid sites,higher content of Ce^(3+),Mn^(4+),and surface adsorbed oxygen.The synergistic effect between Mn^(4+)and Ce^(3+)is enhanced while the surface acidity is increased,which is conducive to the improvement of the denitrification performance of the catalyst at low temperatures.展开更多
基金The financial supports of the National Natural Science Foundation of China(22076180)the Key Project of Science and Technology Talent and Independent Innovation of Beibei District Science and Technology Bureau,Chongqing(2024-18)Chongqing Bayu Scholar program(Young Scholar,YS2020048)are gratefully acknowledged。
文摘The MnCeO_(x)catalysts were synthesized via the co-precipitation method,with calcination temperatures ranging from 300 to 850℃.The results demonstrate that MnCeO_(x)-350℃catalyst exhibits the optimal NO_(x)conversion rate within the reaction temperature range of 175–325℃.To understand the reasons for the influence of calcination temperature on the performance of catalysts,four representative catalysts were chosen for detailed analysis:MnCeO_(x)-300℃,MnCeO_(x)-350℃,MnCeO_(x)-650℃,and MnCeO_(x)-750℃.The catalysts were characterized through various techniques including nitrogen physisorption analysis,X-ray diffraction,Raman spectroscopy,hydrogen temperature programmed reduction,ammonia temperature programmed desorption,X-ray photoelectron spectroscopy,and in situ diff use reflectance infrared Fourier transform spectroscopy experiments.In addition,we assessed the water and SO_(2)resistance of these catalysts.The results demonstrate that the reason why MnCeO_(x)-350℃has good performance is not only because of its lower crystallinity and higher specific surface area but also because the catalyst can provide more Br?nsted acid sites,higher content of Ce^(3+),Mn^(4+),and surface adsorbed oxygen.The synergistic effect between Mn^(4+)and Ce^(3+)is enhanced while the surface acidity is increased,which is conducive to the improvement of the denitrification performance of the catalyst at low temperatures.
