DeNOx performance and resistance to H2O and SO2 of Mn-Ce doped V-W/Ti catalyst at middle-low temperature

doi:10.16085/j.issn.1000-6613.2017-1581

Abstract

Abstract: Due to the selective catalytic reduction(SCR)activities of Mn at low temperature and the oxygen storage capacity of Ce,Mn and Ce were introduced into V-W/Ti. Eight catalyst samples were prepared by the impregnation method. The experiments of deNO_x and resistance to H₂O and SO₂ for the catalysts were conducted with ammonia gas as the reductant in a fixed-bed stainless steel reactor. The properties of different catalysts were characterized by NH₃-TPD,H₂-TPR,N₂-physisorption,and XRD. The 3V-10W-7.7Mn-4.3Ce/75Ti catalyst sample showed satisfactory performance at 240℃ with NO removal efficiency>95% at 180-330℃ and 80% remaining in H₂O and SO₂ at 240℃. It possesses substantial strong acid sites that enhances the adsorption capacity for NH₃ due to the 7.7% MnO₂,and moderate Ce also promotes its low-temperature redox capacity. MnO₂ and CeO₂ can highly be dispersed on the surface of TiO₂ although the BET surface area of 3V-10W-7.7Mn-4.3Ce/75Ti is close to 67m²/g.

Key words: selective catalytic reduction, catalyst, Mn-Ce, V-W/Ti, middle-low temperature, resistance to H₂O and SO₂

摘要： 结合Mn的低温脱硝活性与Ce的储氧能力，将Mn-Ce作为整体改性剂，添加到传统钒钨钛催化剂中，用浸渍法制备了8份样品，以NH₃为还原剂，于管式固定反应器内进行脱硝及抗水抗硫实验，通过NH₃-TPD、H₂-TPR、N₂物理吸附测试、XRD手段对样品进行表征。综合脱硝活性及240℃抗水抗硫测试结果，选出较优的改性催化剂为3V-10W-7.7Mn-4.3Ce/75Ti，其在180～330℃保持脱硝活性95%以上，240℃抗水抗硫活性稳定在80%左右。该样品的比表面积虽然不到67m²/g，但是MnO₂与CeO₂高度分散在TiO₂表面；7.7%含量的MnO₂也使催化剂具有大量的强酸位点，能够增强对NH₃的吸附；适当含量的Ce也增强了催化剂的低温氧化还原能力。

关键词: 选择催化还原, 催化剂, 锰铈, 钒钨钛, 中低温, 抗水抗硫

CLC Number:

X511

HUANG Jin, ZHONG Zhaoping, ZHU Lin, XUE Jianming, XU Yueyang, WU Peiting. DeNO_x performance and resistance to H₂O and SO₂ of Mn-Ce doped V-W/Ti catalyst at middle-low temperature[J]. Chemical Industry and Engineering Progress, 2018, 37(06): 2242-2248.

黄金, 仲兆平, 朱林, 薛建明, 许月阳, 吴培亭. 锰铈改性钒钨钛中低温SCR催化剂脱硝及抗水抗硫性能[J]. 化工进展, 2018, 37(06): 2242-2248.

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DeNO_x performance and resistance to H₂O and SO₂ of Mn-Ce doped V-W/Ti catalyst at middle-low temperature

锰铈改性钒钨钛中低温SCR催化剂脱硝及抗水抗硫性能

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