铜锰型催化剂对低浓度乙醇的催化燃烧性能  

Catalytic combustion performance of copper manganese catalyst for low concentration ethanol

作　　者：杨曦怒 罗兰妮 周敬懿 刘建英[1] 何俊良 卓磊 黎云 于海晨 YANG Xinu;LUO Lanni;ZHOU Jingyi;LIU Jianying;HE Junliang;ZHUO Lei;LI Yun;YU Haichen(College of Resources and Environment,Chengdu University of Information Technology)

机构地区：[1]成都信息工程大学资源环境学院

出　　处：《环境工程技术学报》2023年第2期527-533,共7页Journal of Environmental Engineering Technology

基　　金：国家自然科学基金项目(51608061);四川省大学生创新创业训练计划项目(202110621043)。

摘　　要：乙醇汽油车尾气中除了传统汽油车的三大常规污染物(CO、NO_(x)和HCs),还含有导致光化学烟雾和臭氧污染的醇醛类非常规有机物。采用共沉淀法制备了CuO_(x)、MnO_(x)和CuMnO_(x)催化剂用于乙醇汽油车冷启动排放的低浓度乙醇的催化燃烧,同时采用氮气吸附脱附技术(BET)、X射线衍射(XRD)、氢气程序升温还原(H_(2)-TPR)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)对催化剂进行了表征。研究表明,CuMnO_(x)催化剂对低浓度乙醇具有较好的低温催化活性;当反应温度为185℃时,CO_(2)产率可达86%,优于单一的CuO_(x)催化剂(约20%);同时,CuMnO_(x)比MnO_(x)具有较高的CO_(2)选择性。Cu、Mn之间的相互作用改变了催化剂的织构、结构和氧化性能,引起了催化剂表面晶貌和电子环境的变化,使得CuMnO_(x)催化剂表面具有大量的氧缺陷位,有利于氧分子在其表面的吸附,进而活化成表面活性氧物种。In addition to the three conventional pollutants(CO,NO_(x) and HCs)of traditional gasoline vehicles,gasohol vehicle exhausts also contained alcohols and aldehydes which led to photochemical smog and ozone pollution.CuO_(x),MnO_(x) and CuMnO_(x) catalysts were prepared by the co-precipitation method for catalytic combustion of low-concentration ethanol emitted from gasohol vehicles in cold start.Moreover,the catalysts were characterized by BET nitrogen adsorption-desorption,X-ray diffraction(XRD),hydrogen temperature programmed reduction(H_(2)-TPR),scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).The results showed that CuMnO_(x) catalyst had a better low-temperature catalytic activity for low-concentration ethanol.When the reaction temperature was 185℃,the yield of CO_(2) was as high as 86%,better than that of single CuO_(x) catalyst(about 20%).Meanwhile,CuMnO_(x) had a higher CO_(2) selectivity than MnO_(x).The interactions between Cu and Mn altered the texture,structure and oxidation performance of the catalyst,resulting in the changes in the crystal morphology and electronic environment of the catalyst.There were a large number of oxygen defect sites on the surface of CuMnO_(x),which was in favour of the adsorption of oxygen molecules,then turning into surface active oxygen species.

关 键 词：铜锰型催化剂 乙醇汽油车尾气 冷启动 低浓度乙醇 催化燃烧 

分 类 号：X701[环境科学与工程—环境工程]