Ce对MnOx/Al2O3上NO吸附和氧化的影响

IF 2.8 4区 工程技术 Q2 CHEMISTRY, APPLIED Adsorption Science & Technology Pub Date : 2021-09-07 DOI:10.1155/2021/3131309
Chunhui Mou, Hui Li, Ning Dong, S. Hui, Denghui Wang
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引用次数: 3

摘要

采用超声波浸渍法制备了不同Ce掺杂量的MnOx/Al2O3催化剂,并在固定床石英管炉中测试了其对NO氧化去除的催化活性。同时,通过X射线衍射(XRD)、X射线光电子能谱(XPS)、全自动物理化学吸附仪和场发射扫描电子显微镜(FESEM)对催化剂进行了表征,分析了Ce的添加对吸附容量和催化活性的影响。实验结果表明,Ce的加入大大提高了MnOx/Al2O3催化剂的活性。根据表征结果,可以得出结论,Ce掺杂导致催化剂表面晶相发生显著变化,增加了表面晶格氧的相对含量,促进了NO的催化氧化,可以推断,Mn0.4Ce0.05/Al表面形成了锰铈固溶体。此外,Ce的加入增加了催化剂的孔径,增强了NO和O2与催化剂表面活性位点的吸附和接触,降低了反应物在内部扩散过程中的阻力。所有这些归属于Mn0.4Ce0.05/Al的变化都有利于NO的催化氧化。
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Effect of Ce Addition on Adsorption and Oxidation of NO over MnO x /Al2O3
The MnO x /Al2O3 catalysts with different Ce content doping were prepared by an ultrasonic impregnation method, and the catalytic activity for NO oxidation removal was tested in a fixed-bed quartz tube furnace. Simultaneously, the catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), full-automatic physical-chemical adsorption instrument, and field emission scanning electron microscope (FESEM) to analyze the effect of Ce addition on the adsorption capacity and catalytic activity. Experimental results validated that the activity of the MnO x /Al2O3 catalyst was greatly promoted with Ce addition. According to the characterization results, it could be concluded that Ce doping led to significant changes in the crystalline phase on the catalyst surface, which increased the relative content of surface lattice oxygen and promoted the catalytic oxidation of NO. By observing the physical properties of the surface and analyzing the surface elements of the catalyst, it could be inferred that a manganese-cerium solid solution was formed on the surface of Mn0.4Ce0.05/Al. Moreover, Ce addition increased the catalyst pore size, which enhanced the adsorption and contact of NO and O2 with the active sites on the catalyst surface, and reduced the resistance of the reactants during internal diffusion. All these variations assigned to Mn0.4Ce0.05/Al were favorable for the catalytic oxidation of NO.
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来源期刊
Adsorption Science & Technology
Adsorption Science & Technology 工程技术-工程:化工
CiteScore
5.00
自引率
10.30%
发文量
181
审稿时长
4.5 months
期刊介绍: Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.
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