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自蔓延燃烧法制备锰氧化物催化剂及其催化燃烧炭烟颗粒

Preparation of manganese oxide catalysts by self-propagating combustion method and their catalytic performance for soot combustion
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摘要 柴油机尾气中的炭烟颗粒是城市雾霾的主要来源之一,严重污染环境和危害人体的健康。因此,降低和消除柴油车尾气中的炭烟颗粒具有重要的意义。本文以高锰酸钾和一水柠檬酸为原料,通过自蔓延燃烧法成功制备了一系列锰氧化物催化剂。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、N_(2)吸附-脱附、H_(2)程序升温还原(H_(2)-TPR)、O_(2)程序升温氧化(O_(2)-TPD)和X射线光电子能谱(XPS)等手段对催化剂进行了表征,并考察了该系列催化剂催化炭烟颗粒燃烧的活性。结果表明,制备的锰氧化物催化剂均具有良好的催化燃烧炭烟活性。当高锰酸钾与一水柠檬酸的摩尔比为12∶1、煅烧温度为450℃时,制备的催化剂具有较低的还原峰温度,较大的比表面积和孔径以及化学吸附氧和Mn^(4+)含量,从而表现出最佳催化燃烧炭烟颗粒的性能,其催化燃烧炭烟温度T_(10)、T_(50)和T_(90)分别为284℃、327℃和360℃。 Soot particles released from diesel exhaust are one of the main sources of urban smog,which seriously pollute the environment and endanger human health.Therefore,it is of great significance to reduce and eliminate soot particles.In this paper,a series of manganese oxide catalysts were successfully prepared by self-propagating combustion technique using potassium permanganate acid and citric acid monohydrate as raw materials.The catalysts were characterized by means of X-ray diffraction(XRD),scanning electron microscope(SEM),N_(2)adsorption-desorption measurements,H_(2) temperatureprogrammed reduction(H_(2)-TPR),O_(2)temperature-programmed oxidation(O_(2)-TPD)and X-ray photoelectron spectroscopy(XPS).The catalytic performance of the as-prepared catalysts for soot combustion was also investigated.The results showed that all the as-prepared manganese oxide catalysts had good catalytic activity for soot combustion.When the mole ratio of potassium permanganate and citric acid was 12∶1 and the calcination temperature was 450℃,the obtained catalyst had the lowest reduction peak temperature,the largest specific surface area and pore diameter and chemisorbed oxygen and Mn^(4+) content.Thus,it exhibited the best catalytic performance for soot combustion and its T_(10),T_(50) and T_(90) temperatures were 284℃,327℃and 360℃respectively for soot combustion.
作者 彭超 于迪 王斓懿 张春雷 于学华 赵震 PENG Chao;YU Di;WANG Lanyi;ZHANG Chunlei;YU Xuehua;ZHAO Zhen(Institute of Catalysis for Energy and Environment,College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,Liaoning,China;State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China)
出处 《化工进展》 EI CAS CSCD 北大核心 2022年第2期770-780,共11页 Chemical Industry and Engineering Progress
基金 国家自然科学基金(22072095,U1908204,21761162016) 国家科技部重点研发计划(2017YFE0131200) 辽宁省自然基金面上项目(2019-MS-284) 移动源污染排放控制技术国家工程实验室开放基金(NELMS2018A04) 沈阳师范大学创新团队支持计划 沈阳师范大学重大孵化项目(ZD201901)。
关键词 自蔓延燃烧法 锰氧化物 催化剂 催化 炭烟颗粒 self-propagating combustion method manganese oxides catalyst catalysis soot particles
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