Chemical Industry and Engineering Progress ›› 2017, Vol. 36 ›› Issue (08): 2941-2948.DOI: 10.16085/j.issn.1000-6613.2016-2293

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

CHEN Yanan, DUAN Yufeng, ZHU Chun, ZHOU Qiang, HU Peng, LI Chunfeng, WANG Shuangqun   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2016-12-09 Revised:2017-02-09 Online:2017-08-05 Published:2017-08-05

Mo/Mn-TiO2催化剂的脱硝活性及抗SO2性能

陈亚南, 段钰锋, 朱纯, 周强, 胡鹏, 李春峰, 王双群   

  1. 东南大学能源与环境学院, 能源热转换及其过程测控教育部重点实验室, 江苏 南京 210096
  • 通讯作者: 段钰锋,博士,教授,博士生导师。
  • 作者简介:陈亚南(1990-),女,硕士研究生。E-mail:220140430@seu.edu.cn。
  • 基金资助:
    国家自然科学基金(51376046,51576044)、江苏省普通高校研究生科研创新计划(CXZZ13_0093,KYLX_0115,KYLX_0184,KYLX15_0071)、东南大学优秀博士学位论文培育基金(YBJJ1505)及国家重点研究开发计划(2016YFB0600604)项目。

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-NOx 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-NOx 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-NOx 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: 

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