Ce的掺杂对负载型催化剂LaMnO3/赤铁矿脱硝性能的影响

doi:10.16085/j.issn.1000-6613.2016.s2.033

化工进展 ›› 2016, Vol. 35 ›› Issue (S2): 192-199.DOI: 10.16085/j.issn.1000-6613.2016.s2.033

Ce的掺杂对负载型催化剂LaMnO₃/赤铁矿脱硝性能的影响

王瑞, 归柯庭, 梁辉

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

收稿日期:2016-04-26 修回日期:2016-06-06 出版日期:2016-12-31 发布日期:2016-12-22
通讯作者: 归柯庭。E-mail:ktgui@seu.edu.cn。
作者简介:王瑞(1990-),女,硕士研究生。
基金资助:
国家科学自然基金项目（51276039）。

Effect of Ce-doped on performance of supported perovskite catalyst LaMnO₃/hematite for SCR of NO by NH₃

WANG Rui, GUI Keting, LIANG Hui

Key Laboratory of Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China

Received:2016-04-26 Revised:2016-06-06 Online:2016-12-31 Published:2016-12-22

摘要/Abstract

摘要： 采用柠檬酸络合浸渍法，通过对A位离子进行掺杂或取代和调节Ce的掺杂量，制备了一系列的负载型催化剂La_1-xA_xMnO₃/赤铁矿（A=Ce、Co，x=0/0.1/0.2/0.3），并将催化剂应用于固定床NH₃-SCR脱硝。采用XRD、BET、XRF、H₂-TPR、NH₃-TPD等表征手段对催化剂进行分析和表征。结果表明，Ce的掺杂提高了催化剂LaMnO₃/赤铁矿的低温脱硝效率和拓宽了催化剂的活性温度窗口，如La_0.8Ce_0.2MnO₃/赤铁矿催化剂，在180℃时，脱硝效率就高达98%，且在150～250℃温度区间的脱硝效率均在90%以上。结合表征分析证明，稀土元素Ce的适量掺杂，明显提高了LaMnO₃/赤铁矿催化剂的氧化还原能力和催化剂表面NH₃分子的吸附能力；稀土元素Ce的适量掺杂也改善了催化剂比表面积，也使活性物质高度分散在载体表面上。

关键词: 催化剂LaMnO₃/赤铁矿, 选择性催化还原脱硝, Ce掺杂, 柠檬酸络合浸渍法

Abstract: Supported perovskite catalysts La_1-xCe_xMnO₃/hematite were prepared by the citric acid complexing method and used for selective catalytic reduction of NO by NH₃(NH₃-SCR).A series of lanthanum manganite perovskite catalysts were prepared by doping and adjusting the amount of Ce/Co.With the help of the static physical and chemical adsorption of nitrogen(BET),X-ray diffraction(XRD),X-ray fluorescence(XRF),temperature program desorption(TPD),its phase morphology and surface topography and the active component of La_1-xCe_xMnO₃/hematite catalyst are obtained and characterized.The results showed:the catalysts doped with Ce suitably,have a stronger ability to redox,NH₃ adsorption capacity; and a better phase morphology,surface topography.It also makes sure that the active component is more uniformly supported on the support surface.Due to the reactants(NH₃,O₂ and NO) more easily adsorbed on the catalyst surface to react,the de-NO_x efficiency has been improved.The performance of de-NO_x efficiency is best at the condition of the doping amount of Ce_x=0.2.At 180℃,the de-NO_x efficiency of La_0.8Ce_0.2MnO₃/hematite is up to 98%,at the temperature window of 150~250℃,it is always above 90%.

Key words: catalysts La_1-x Ce_x MnO₃/hematite, DeNO_x-SCR, Ce-doped, the citric acid complexing method

中图分类号:

TQ032

王瑞, 归柯庭, 梁辉. Ce的掺杂对负载型催化剂LaMnO₃/赤铁矿脱硝性能的影响[J]. 化工进展, 2016, 35(S2): 192-199.

WANG Rui, GUI Keting, LIANG Hui. Effect of Ce-doped on performance of supported perovskite catalyst LaMnO₃/hematite for SCR of NO by NH₃[J]. Chemical Industry and Engineering Progree, 2016, 35(S2): 192-199.

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Ce的掺杂对负载型催化剂LaMnO₃/赤铁矿脱硝性能的影响

Effect of Ce-doped on performance of supported perovskite catalyst LaMnO₃/hematite for SCR of NO by NH₃

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