助剂添加对CuO/TiO2催化剂NH3-SCO性能的影响研究

陈浩辉; 王亚洲; 余杰; 邱磊; 尹一萌; 王驰中; 常化振

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (10) : 5123-5130.

大气污染与控制

助剂添加对CuO/TiO₂催化剂NH₃-SCO性能的影响研究

陈浩辉¹, 王亚洲², 余杰¹, 邱磊¹, 尹一萌¹, 王驰中¹, 常化振¹

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Effect of additives and SO₂ on selective catalytic oxidation of NH₃ over CuO/TiO₂ catalysts

CHEN Hao-hui¹, WANG Ya-zhou², YU Jie¹, QIU Lei¹, YIN Yi-meng¹, WANG Chi-zhong¹, CHANG Hua-zhen¹

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摘要

采用浸渍法制备了一系列CuO-MO_x/TiO₂ （M=W， Zr， La）催化剂用于NH₃选择性催化氧化（NH₃-SCO），同时探究了SO₂中毒对NH₃氧化性能的影响.结果表明，过渡金属氧化物的添加使Cu/TiO₂催化剂NH₃转化率降低，但显著提高N₂选择性.其中，WO₃具有最好的促进效果，在300℃下催化剂N₂选择性提高了36%.通过H₂-TPR和NH₃-TPD表征发现，WO₃的添加增加了Cu/TiO₂催化剂表面酸性位点的数量，促进NH₃的吸附，但降低催化剂氧化还原性能，抑制NH₃氧化为NO_x.经SO₂中毒处理后，CuO-MO_x/TiO₂催化剂N₂选择性进一步提高，表征结果表明，酸性位点的增加和氧化氧化还原性的降低是提高催化剂N₂选择性的关键.

Abstract

A series of CuO-MO_x/TiO₂ (M=W, Zr, La) catalysts were prepared by impregnation method for the selective catalytic oxidation of NH₃, and the effects of SO₂ poisoning on the oxidation of NH₃ over Cu/Ti-based catalysts were investigated. The results show that adding of transition metal oxides decreased the NH₃ conversion efficiency of Cu/Ti catalyst slightly, but significantly improved the N₂ selectivity. WO₃ was the best promoter among those additives, with an increase of N₂ selectivity by 36% at 300℃ in comparison to Cu/Ti catalyst. The H₂-TPR and NH₃-TPD results indicate that adding of WO₃ significantly increased the number of acid sites on the surface of Cu/Ti catalyst, and promoted the adsorption of NH₃. But it affected the redox performance of the catalyst and inhibited the oxidation of NH₃ to NO_x. After SO₂ poisoning, the N₂ selectivity of CuO-MO_x/TiO₂ catalyst was further improved. The characterization results shows that the increase of acid sites and the reduction of redox performance are the key factors to improve the N₂ selectivity.

导出引用

陈浩辉, 王亚洲, 余杰, 邱磊, 尹一萌, 王驰中, 常化振. 助剂添加对CuO/TiO₂催化剂NH₃-SCO性能的影响研究[J]. 中国环境科学. 2023, 43(10): 5123-5130

CHEN Hao-hui, WANG Ya-zhou, YU Jie, QIU Lei, YIN Yi-meng, WANG Chi-zhong, CHANG Hua-zhen. Effect of additives and SO₂ on selective catalytic oxidation of NH₃ over CuO/TiO₂ catalysts[J]. China Environmental Science. 2023, 43(10): 5123-5130

中图分类号： X511

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