A series of metals(Co

Ce and Ni) were introduced into non-pitch coal-based activated coke (NPAC) by isometric impregnation method to elevate the low-temperature activity of NH_3-SCR.The modified NPAC was characterized by N_2 adsorption

X-ray diffraction(XRD)

X-ray photoelectron spectroscopy(XPS) and NH_3-temperature programmed desorption(NH_3-TPD) techniques.The results show that

the low-temperature denitrification activity of both the single modified NPAC and co-modified NPAC was enhanced

and the comodified NPAC exhibited a stronger ability of denitrification.The cobalt

cerium and nickel species incorporated the graphite crystalline structure of the NPAC

and were dispersed uniformly in the surface of the NPAC.The existing forms of Ce in the surface of the modified NPAC were Ce~(3+) and Ce~(4+)

with Ce~(4+) as the major form

the existing forms of Co were Co~(2+) and Co~(3+)

and the existing forms of Ni were Ni~(2+) and Ni~(3+).The modification has improved the chemisorbed oxygen concentration and enhanced the surface acidity of the NPAC

which promoted the NO oxidation and enhanced the ammonia adsorption and activation capacity of the NPAC.The denitrification rate of the NPAC-CoCeNi-7 at 150 ℃ was as high as 71.55%.