Effect of loading sequence of Mn and Ce on the activity of Mn-Ce/TiO2 catalysts at low-temperature

doi:10.16085/j.issn.1000-6613.2015.06.025

Chemical Industry and Engineering Progree ›› 2015, Vol. 34 ›› Issue (06): 1652-1655.DOI: 10.16085/j.issn.1000-6613.2015.06.025

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Effect of loading sequence of Mn and Ce on the activity of Mn-Ce/TiO₂catalysts at low-temperature

YAN Dongjie, YU Ya, XU Ying, HUANG Xuemin

Key Laboratory of Northwest Water Resource, Environment and Ecology, Minisery of Education, School of Environmental & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, Shaanxi, China

Received:2014-10-11 Revised:2014-12-03 Online:2015-06-05 Published:2015-06-05

Mn、Ce负载顺序对催化剂Mn-Ce/TiO₂低温脱硝活性的影响

闫东杰, 玉亚, 徐颖, 黄学敏

西北水资源与环境生态教育部重点实验室, 西安建筑科技大学环境与市政工程学院, 陕西西安 710055

通讯作者: 闫东杰(1981—),男,博士,讲师,主要从事大气污染控制研究。E-mail:yandongjie_2000@163.com。
作者简介:闫东杰(1981—),男,博士,讲师,主要从事大气污染控制研究。E-mail:yandongjie_2000@163.com。
基金资助:
陕西省教育厅科研计划(14JK1392)及西安建筑科技大学科技基金(DB03132、DA03124)项目。

Abstract

Abstract: Manganese and cerium oxide catalysts were prepared by sol-gel method and used for the low-temperature selective catalytic reduction (SCR) of NO with NH₃. The catalysts were characterized by BET surface area, X-ray diffraction (XRD) and scanning electron microscope (SEM). The influence of loading sequence on the structure of Mn-Ce/TiO₂ catalysts was investigated. The results showed that the phase structure of catalysts was anatase. Mn and Ce distributed in amorphous form. When Mn and Ce were supported on same carrier, the specific surface area of catalyst was the largest, which achieved 97.6m²/g, and active components of Mn and Ce were well distributed. The catalyst activity was also the highest when Mn and Ce were supported on same carrier. The NO removal efficiency was above 90%, when the reaction temperature was 200℃.

Key words: catalyst, selective catalytic reduction (SCR), reactivity, loading sequence, flue gas denitration

摘要： 采用溶胶凝胶法制备了一系列Mn-Ce/TiO₂催化剂样品, 并用比表面积及孔径分析仪(BET)、X射线衍射仪(XRD)和扫描电子显微镜(SEM)等对催化剂进行了表征, 考察了活性组分Mn、Ce负载顺序对催化剂结构的影响, 并在固定床连续流动反应器上对其催化活性进行了评价。结果表明, 催化剂晶相均为锐钛矿型结构, Mn、Ce活性组分在载体表面高度分散或形成了无定形结构;Mn、Ce同时负载时催化剂表面活性组分分布均匀, 比表面积最大, 为97.6m²/g, 且催化剂孔径分布以中孔为主;Mn、Ce同时负载时催化剂活性最好, 反应温度为200℃时, NO转化率达到90%以上。

关键词: 催化剂, 选择催化还原, 活性, 负载顺序, 烟气脱硝

CLC Number:

X511

YAN Dongjie, YU Ya, XU Ying, HUANG Xuemin. Effect of loading sequence of Mn and Ce on the activity of Mn-Ce/TiO₂catalysts at low-temperature[J]. Chemical Industry and Engineering Progree, 2015, 34(06): 1652-1655.

闫东杰, 玉亚, 徐颖, 黄学敏. Mn、Ce负载顺序对催化剂Mn-Ce/TiO₂低温脱硝活性的影响[J]. 化工进展, 2015, 34(06): 1652-1655.

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Effect of loading sequence of Mn and Ce on the activity of Mn-Ce/TiO₂catalysts at low-temperature

Mn、Ce负载顺序对催化剂Mn-Ce/TiO₂低温脱硝活性的影响

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