γ-Al2O3酸性修饰稀土尾矿NH3-SCR脱硝性能

付金艳; 王振峰; 白心蕊; 崔梦壳; 武文斐

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中国环境科学 ›› 2020, Vol. 40 ›› Issue (9) : 3741-3747.

大气污染与控制

γ-Al₂O₃酸性修饰稀土尾矿NH₃-SCR脱硝性能

付金艳¹, 王振峰², 白心蕊¹, 崔梦壳¹, 武文斐^1,2

作者信息 +

Denitration performance of NH₃-SCR from γ-Al₂O₃ acid modified rare earth tailings

FU Jin-yan¹, WANG Zhen-feng², BAI Xin-rui¹, CUI Meng-ke¹, WU Wen-fei^1,2

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摘要

为增加脱硝催化剂的酸性位点和比表面积，以稀土尾矿为活性主体，通过物理球磨方式添加γ-Al₂O₃，制得NH₃-SCR催化剂，脱硝温度为100~400℃.结果表明：原尾矿脱硝活性为7.6%，γ-Al₂O₃的脱硝活性为9.4%，稀土尾矿添加50%γ-Al₂O₃脱硝活性达到了64.8%，即添50%γ-Al₂O₃后加极大程度地提高了尾矿的脱硝活性.XRD实验结果表明：Al₂O₃不会与尾矿成分发生反应生成新的物质.SEM实验结果表明：当添加γ-Al₂O₃低于50%时，γ-Al₂O₃均匀分散在尾矿表面，当添加65%γ-Al₂O₃和80%γ-Al₂O₃时，γ-Al₂O₃发生团聚，分散性较差.NH₃-TPD实验结果表明：添加γ-Al₂O₃为脱硝催化剂增加酸性位点，但是当添加γ-Al₂O₃过低时（15%、35%），吸附NH₃量不足，催化反应进行不完全.BET实验结果表面：添加γ-Al₂O₃可以增加尾矿的比表面积.

Abstract

In order to increase the acidic sites and specific surface area of the denitration catalyst, with rare earth tailings as the active main body, γ-Al₂O₃ was added by physical ball milling to prepare NH₃-SCR catalyst. The denitration temperature was 100~400℃. The experimental results showed that the denitration activity of the original tailings was 7.6%, the denitration activity of γ-Al₂O₃ was 9.4%, and the denitration activity of rare earth tailings with 50% γ-Al₂O₃ reached 64.8%, That was to say, adding 50wt% γ-Al₂O₃ could denitrification activity of tailings greatly. The XRD results showed that γ-Al₂O₃ cann't react with tailings to form new materials. The SEM results showed that γ-Al₂O₃ was uniformly dispersed on the tailings when adding weight of γ-Al₂O₃ was less than 50%. If adding weight of γ-Al₂O₃ was more than 50%, γ-Al₂O₃ agglomerated on the tailings and showed poor dispersion. The results of NH₃-TPD showed that adding γ-Al₂O₃ can enhance the amount of acid sites. And the NH₃ adsorption first increased and then decresed with the increase of addition weight of γ-Al₂O₃. However, if addition weight of γ-Al₂O₃ was too low (15wt%, 35wt%), the amount of NH₃ adsorption was inadequate, resulting in incomplete catalytic reaction. The BET results showed that the specific surface area of tailings could be increased by adding γ-Al₂O₃.

导出引用

付金艳, 王振峰, 白心蕊, 崔梦壳, 武文斐. γ-Al₂O₃酸性修饰稀土尾矿NH₃-SCR脱硝性能[J]. 中国环境科学. 2020, 40(9): 3741-3747

FU Jin-yan, WANG Zhen-feng, BAI Xin-rui, CUI Meng-ke, WU Wen-fei. Denitration performance of NH₃-SCR from γ-Al₂O₃ acid modified rare earth tailings[J]. China Environmental Science. 2020, 40(9): 3741-3747

中图分类号： X511

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