Effect of synergistically constructed pore configuration and nitrogen-containing functional groups on low-temperature NO reduction performance of activated coke
Low-temperature NH3-SCR is an important technology choice for flue gas denitrification in non-electricity industries with low exhaust temperature,and low-cost carbon materials with good structural tunability are one of the most promising low-temperature NH3-SCR catalysts,but face the bottleneck of low denitrification efficiency.In this paper,based on a one-step catalytic activation process,activated coke catalysts with typical pore configurations and nitrogen-containing functional groups were prepared from low-cost and large-volume Jundong coal as raw materials,and the effects of activated coke pore configurations and surface functional groups on the low-temperature NH3-SCR under different flue gas conditions were investigated.The results showed that both graded pores and nitrogen-containing functional groups have significant effects on NH3-SCR,and the nitrogen-doped graded-porous activated coke with both graded pores and nitrogen-containing functional groups has the optimal performance of NH3-SCR due to the simultaneous improve-ment of the mass transfer channels and reaction kinetics,and its denitrification efficiency reaches as high as 83.5％under the condition of 160 ℃.The enhancement effects of graded pores and nitrogen-containing functional groups on the NH3-SCR performance are more obvi-ous in the presence of SO2 or H2O,and the denitrification efficiency of microporous activated coke decays from 39.6％to 13.8％and 34.9％,whereas the denitrification efficiency of nitrogen-doped graded-porous coke improves to 86.4％and 86.7％,respectively.This may be related to the synergistic effect between different flue gas components enhanced by the functionalized graded pore environment.In this study,the dependence between the performance of carbon-based low-temperature NH3-SCR and the physicochemical structure of the carbon materials was investigated,which provides a new idea for the development of high-performance carbon-based low-temperature NH3-SCR technology.
low-temperature NH3-SCRcoal-based activated cokepore configurationnitrogen-containing functional groupssynergis-tic construction
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