化工学报 ›› 2014, Vol. 65 ›› Issue (12): 4805-4813.DOI: 10.3969/j.issn.0438-1157.2014.12.022

• 催化、动力学与反应器 • 上一篇    下一篇

微波热解制备g-Fe2O3催化剂及其SCR脱硝性能

王栋1,2, 张信莉1, 路春美1,2, 韩奎华1,2, 彭建升1, 徐丽婷1   

  1. 1. 山东大学能源与动力工程学院, 山东 济南 250061;
    2. 燃煤污染物减排国家工程实验室(山东大学), 山东 济南 250061
  • 收稿日期:2014-05-17 修回日期:2014-08-22 出版日期:2014-12-05 发布日期:2014-12-05
  • 通讯作者: 路春美
  • 基金资助:

    国家自然科学基金项目(51276101);山东省自然科学基金项目(ZR2012EEM013);高等学校博士学科点专项科研基金项目(20120131110022).

Microwave-assisted preparation of g-Fe2O3 as SCR catalysts

WANG Dong1,2, ZHANG Xinli1, LU Chunmei1,2, HAN Kuihua1,2, PENG Jiansheng1, XU Liting1   

  1. 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China;
    2. National Engineering Laboratory for Coal-Burning Pollutants Emission Reduction, Shandong University, Jinan 250061, Shandong, China
  • Received:2014-05-17 Revised:2014-08-22 Online:2014-12-05 Published:2014-12-05
  • Supported by:

    supported by the National Natural Science Foundation of China (51276101), the Natural Science Foundation of Shandong Province (ZR2012EEM013) and the Specialized Research Fund for the Doctoral Program of Higher Education (20120131110022).

摘要: 以FeSO4·7H2O[Fe(NO3)3·9H2O]为铁源,采用新型微波热解法制备γ-Fe2O3[a-Fe2O3]催化剂样品,通过XRD、N2等温吸附-脱附、压汞法等实验手段对催化剂样品晶相、微观孔结构等进行表征;考察两种催化剂样品的NH3-SCR脱硝性能,通过归一化处理得到两种催化剂在不同温度下的本征脱硝反应速率,同时对比研究了γ-Fe2O3与钒系催化剂的脱硝活性;研究氨氮比、氧浓度等运行参数对γ-Fe2O3催化剂NH3-SCR脱硝性能的影响规律,并对其抗硫抗水性能进行考察.结果表明:采用新型微波热解法可得到纯度较高的γ-Fe2O3催化剂,其介孔分布合理且大孔数量丰富;同时γ-Fe2O3催化剂表现出优于a-Fe2O3催化剂的脱硝性能,400℃时最大NOx转化率达到96%,300、325、350℃下单位面积脱硝速率达到a-Fe2O3催化剂的3倍左右;γ-Fe2O3催化剂具备优良的抗硫抗水性能,其最佳氨氮比为1、最佳氧体积分数为3.5%.

关键词: γ-Fe2O3, 催化剂, 微波, 热解, 选择催化还原, 脱硝

Abstract: γ-Fe2O3 and a-Fe2O3 catalysts were prepared respectively via a novel microwave pyrolysis method using FeSO4·7H2O and Fe(NO3)3·9H2O as ferrous source. Crystalline phase and microstructure of catalysts were characterized by X-ray diffraction(XRD), mercury intrusion porosimetry(MIP), N2 adsorption-desorption and NH3-SCR activity of different catalysts were investigated. SCR reaction rates over the catalysts at different temperatures were obtained by unitary processing, and SCR activities over γ-Fe2O3 and vanadium-based catalysts were compared. The effects of O2 concentration, molar ratio of NH3/NO, SO2, and H2O on SCR activity of γ-Fe2O3 catalyst were also studied. Pure γ-Fe2O3 catalyst could be obtained via this novel microwave pyrolysis method, and showed higher crystallinity than a-Fe2O3 catalyst. γ-Fe2O3 catalyst had broader pore size distribution as well as appropriate ratios of mesopores and macropores. Meanwhile, γ-Fe2O3 catalyst exhibited better SCR activity than a-Fe2O3 catalyst. The highest NOx conversion of γ-Fe2O3 catalyst was up to 96% at 400℃ and SCR reaction rates normalized by surface area were three times higher than that of a-Fe2O3 catalyst at 300, 325 and 350℃, respectively. The optimum molar ratio of NH3/NO and O2 concentration for selective catalytic reduction over γ-Fe2O3 catalyst were recommended to be 1 and 3.5% (vol), respectively.

Key words: γ-Fe2O3, catalyst, microwave, pyrolysis, SCR, DeNOx

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