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    丁飞扬, 薛源, 张玲, 李春忠. 氧化锰包覆沸石分子筛的制备及其对甲苯的催化氧化[J]. 华东理工大学学报(自然科学版), 2020, 46(4): 495-501. DOI: 10.14135/j.cnki.1006-3080.20190329002
    引用本文: 丁飞扬, 薛源, 张玲, 李春忠. 氧化锰包覆沸石分子筛的制备及其对甲苯的催化氧化[J]. 华东理工大学学报(自然科学版), 2020, 46(4): 495-501. DOI: 10.14135/j.cnki.1006-3080.20190329002
    DING Feiyang, XUE Yuan, ZHANG Ling, LI Chunzhong. Preparation of Manganese Oxide Coating Zeolite Molecular Sieve Catalyst and Its Catalytic Oxidation for Toluene[J]. Journal of East China University of Science and Technology, 2020, 46(4): 495-501. DOI: 10.14135/j.cnki.1006-3080.20190329002
    Citation: DING Feiyang, XUE Yuan, ZHANG Ling, LI Chunzhong. Preparation of Manganese Oxide Coating Zeolite Molecular Sieve Catalyst and Its Catalytic Oxidation for Toluene[J]. Journal of East China University of Science and Technology, 2020, 46(4): 495-501. DOI: 10.14135/j.cnki.1006-3080.20190329002

    氧化锰包覆沸石分子筛的制备及其对甲苯的催化氧化

    Preparation of Manganese Oxide Coating Zeolite Molecular Sieve Catalyst and Its Catalytic Oxidation for Toluene

    • 摘要: 利用高锰酸钾与硝酸锰在溶液中的氧化还原反应,采用一步法合成了氧化锰包覆沸石分子筛复合材料。通过引入介孔模板剂,控制反应温度、浓度来调控氧化锰的结构与性质。结果表明:氧化锰呈现出层状多孔结构;反应温度与浓度不仅可以改变氧化锰的形貌,还会影响复合材料的比表面积以及氧化锰中晶格氧与吸附氧、Mn3+与Mn4+的物质的量之比。最佳条件下制备的氧化锰包覆分子筛催化剂在256 ℃下,对甲苯(0.26 g/m3)的转化率超过90%。

       

      Abstract: Volatile organic compounds (VOCs), which include benzene, toluene and xylene, are harmful to both human health and the environment. It is important to control and reduce the release of VOCs. Transition-metal oxides have been widely studied due to their low cost and relative high activity for catalyzing VOCs. In this work, manganese oxide was used to coat zeolite molecular sieve, producing the composite by a one-step redox reaction between potassium permanganate and manganese nitrate. By introducing a template agent, the reaction temperature and concentration are optimized to modulate the structure and properties of manganese oxide, producing a layered porous structure that sets free the pore of the zeolite molecular sieve thoroughly. The large special surface area of zeolite molecular sieve facilitates the adsorption of VOCs and the manganese oxide coating promotes the catalytic oxidation of VOCs. The results show that the use of different reaction temperature and catalyst concentration leads to the changes of the morphology of manganese oxide, the specific surface area of the composite, the mole ratio of lattice oxygen to adsorbed oxygen, and the mole ratio of Mn3+ to Mn4+ in manganese oxide catalyst. The special surface area of the composite, coating amount, the mole ratio of lattice oxygen to adsorbed oxygen and Mn3+ to Mn4+ together impact the catalytic performance of the composite. An appropriate amount of manganese oxide coated molecular sieve catalyst prepared under ice bath shows the best catalytic performance for toluene (0.26 g/m3), which the toluene conversion reaches above 90% at 256 °C.

       

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