Peanut shell char with high alkali metal and ash content was used in this study to remove nitrogen oxide (NO) from simulated flue gases. Effects of acid pickling and nitrogen doping of the biochar (BC) materials on the removal selectivity were investigated in a fixed bed reactor. Results show that CaO, MgO, SiO₂, AgO₂, CuO, and so on contained in the ash of peanut shell are not conducive to the pore development of biochar and grafting of nitrogen-containing functional groups during the nitrogen doping process. Ash pickling improves the development of pore structure, and decreases the ratios of H/C, O/C, and (O+H)/C. The NO ratio and reaction selectivity of biochar follow the order as pickling treatment (BC-A) > raw peanut shell char (BC) > nitrogen doping treatment (BC-N). Through a combined effect of ash pickling and nitrogen doping, BC-A-N has the highest NO removal ratio and reaction selectivity because of the improved pore characteristics and introduction of nitrogen-containing functional groups.

中文翻译：

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通过酸洗和氮掺杂改性花生壳炭改进模拟烟气中的氮氧化物去除

本研究使用高碱金属和灰分含量的花生壳炭去除模拟烟气中的氮氧化物 (NO)。在固定床反应器中研究了酸洗和氮掺杂生物炭 (BC) 材料对去除选择性的影响。结果表明，CaO、MgO、SiO ₂、AgO ₂花生壳灰分中所含的、CuO等在氮掺杂过程中不利于生物炭的孔隙发育和含氮官能团的接枝。灰分酸洗改善了孔隙结构的发育，降低了H/C、O/C和(O+H)/C的比值。生物质炭的NO比和反应选择性依次为酸洗处理（BC-A）>生花生壳炭（BC）>氮掺杂处理（BC-N）。通过灰洗和氮掺杂的综合作用，BC-AN由于改善了孔隙特性和引入了含氮官能团，具有最高的NO去除率和反应选择性。