NH3-SCR catalytic activity and SO2 resistance over Mo/Mn-TiO2 catalyst

doi:10.16085/j.issn.1000-6613.2016-2293

Abstract

Abstract: Mo/Mn-TiO₂ oxides catalysts have been prepared by impregnation method and employed to selective catalytic reduction of NO with ammonia(NH₃-SCR)on a laboratory fixed-bed. Experimental results of NO removal showed that,in the temperature range of 160-440℃,the dopping of Mn alone can significantly improved the catalytic activity of denitrification,and the NO conversion efficiency was more than 90% between 160-280℃,which shifted the active temperature window to the low temperature observably. With the further doping of Mo,there were different degrees of drop on the NO conversion rate in the temperature of 120-200℃,but the NO conversion rate can be further improved at 240-440℃;The de-NO_x activity decreased with the increase of SO₂ concentration on Mn-TiO₂ catalyst,and the SO₂ resistance dropped more sharply at lower reaction temperature. However,the resistance to SO₂ poisoning was greatly improved after the addition of Mo,and the efficiency of de-NO_x is still more than 90% at 240℃ when the SO₂ concentration was below 0.05%. BET,EDX,H₂-TPR,XRD and XPS were used to characterize the pore structure,surface elements distribution,reaction activity and the morphology of the catalyst systematically,and the mechanism of de-NO_x and SO₂ resistance of Mo/Mn-TiO₂ catalyst was clarified.

Key words: fixed-bed, selective catalytic reduction (SCR), catalyst, denitrification activity, SO₂ resistance

摘要： 采用浸渍法制备了Mo/Mn-TiO₂催化剂并用于实验室固定床氨选择性催化还原NO过程（NH₃-SCR），NO脱除实验结果表明，在160~440℃温度范围内，单独掺入Mn即可大幅提高催化脱硝活性，且在160~280℃温度范围内脱硝效率>90%，使得脱硝活性温度窗口显著向低温偏移；继续掺入Mo后，脱硝效率在120~200℃温度范围内存在不同程度下降，但在240~440℃温度范围内则得到进一步改善；Mn-TiO₂催化剂脱硝活性随SO₂浓度的升高而降低，且在较低反应温度下SO₂中毒程度愈为明显；继续掺入Mo后其抗SO₂中毒性能得到较大提升，240℃反应温度、SO₂体积分数<0.05%时脱硝效率仍保持90%以上。结合BET、EDX、H₂-TPR、XRD和XPS等现代分析技术对催化剂的孔隙结构、表面元素分布、反应活性及特征元素形态等进行了系统表征，阐明了Mo/Mn-TiO₂催化剂的脱硝及抗SO₂中毒机理。

关键词: 固定床, 选择性催化还原, 催化剂, 脱硝活性, 抗SO₂性能

CLC Number:

X511

CHEN Yanan, DUAN Yufeng, ZHU Chun, ZHOU Qiang, HU Peng, LI Chunfeng, WANG Shuangqun. NH₃-SCR catalytic activity and SO₂ resistance over Mo/Mn-TiO₂ catalyst[J]. Chemical Industry and Engineering Progress, 2017, 36(08): 2941-2948.

陈亚南, 段钰锋, 朱纯, 周强, 胡鹏, 李春峰, 王双群. Mo/Mn-TiO₂催化剂的脱硝活性及抗SO₂性能[J]. 化工进展, 2017, 36(08): 2941-2948.

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NH₃-SCR catalytic activity and SO₂ resistance over Mo/Mn-TiO₂ catalyst

Mo/Mn-TiO₂催化剂的脱硝活性及抗SO₂性能

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