柱状稀土尾矿催化剂脱硝性能研究

郄俊懋; 赵泽峰; 许同; 崔梦壳; 侯丽敏

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (2) : 682-692.

大气污染与控制

柱状稀土尾矿催化剂脱硝性能研究

郄俊懋, 赵泽峰, 许同, 崔梦壳, 侯丽敏

作者信息 +

Study on denitration performance of columnar rare earth tailings catalyst

QIE Jun-mao, ZHAO Ze-feng, XU Tong, CUI Meng-ke, HOU Li-min

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摘要

采用铝制溶胶粘结剂(纳米氧化铝与拟薄水铝石), 通过挤条成型法分别制备了NRC和PRC两种柱状脱硝催化剂.并对其进行了脱硝性能研究.结果表明,相比于原尾矿,柱状催化剂脱硝活性明显提升,与PRC相比,NRC脱硝效率更高,达到67%.随着两种粘结剂添加量的增加,机械强度均有一定程度提高.PRC有着更均匀的表面分布,使催化剂拥有更大的比表面积和更多的表面酸位点;H₂-TPR实验表明PRC还原峰的面积变小,还原峰的数量减少,氧化还原能力变弱,这是导致其脱硝性能提升较小的原因;稀土尾矿和NRC表面都存在E-R机理和L-H机理,NRC的E-R机理的作用更强.

Abstract

In the paper, the NRC and PRC columnar denitration catalysts were prepared using aluminum sol binders (nano-alumina and pseudo-boehmite) through the extrusion molding method. Their denitration performance was studied. It was shown that, compared to the original tailings, the denitration activity of the columnar catalysts was significantly improved. Compared to PRC, the denitration efficiency of NRC was found to be higher, reaching 67%. With the increase in the addition of the two binders, the mechanical strength was found to be improved to a certain extent. A more uniform surface distribution was observed in PRC, which allowed the catalyst to have a larger specific surface area and more surface acid sites. It was shown by H₂-TPR experiments that the area of the reduction peaks of PRC was decreased, the number of reduction peaks was reduced, and the redox ability was weakened, which was identified as the reason for its relatively smaller improvement in denitration performance. Both the E-R mechanism and L-H mechanism were observed on the surfaces of rare earth tailings and NRC, and the E-R mechanism of NRC was found to play a stronger role.

导出引用

郄俊懋, 赵泽峰, 许同, 崔梦壳, 侯丽敏. 柱状稀土尾矿催化剂脱硝性能研究[J]. 中国环境科学. 2025, 45(2): 682-692

QIE Jun-mao, ZHAO Ze-feng, XU Tong, CUI Meng-ke, HOU Li-min. Study on denitration performance of columnar rare earth tailings catalyst[J]. China Environmental Science. 2025, 45(2): 682-692

中图分类号： X51

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