一步法合成α-MnO_(2)/β-MnO_(2)催化剂及其对甲苯催化氧化的性能研究  

α-MnO2/β-MnO2 catalysts synthesized by one-pot method and their catalytic performance for the oxidation of toluene

作　　者：李治东 万佳琪 刘莹[2] 唐艺溪 刘威[2] 宋忠贤 张学军 LI Zhidong;WAN Jiaqi;LIU Ying;TANG Yixi;LIU Wei;SONG Zhongxian;ZHANG Xuejun(College of Environmental and Safety Engineering,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China;College of Science,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China;College of Municipal and Environmental Engineering,Henan University of Urban Construction,Pingdingshan 467041,Henan,China)

机构地区：[1]沈阳化工大学环境与安全工程学院,辽宁沈阳110142 [2]沈阳化工大学理学院,辽宁沈阳110142 [3]河南城建学院市政与环境工程学院,河南平顶山467041

出　　处：《化工学报》2022年第8期3615-3624,共10页CIESC Journal

基　　金：国家自然科学基金项目(21872096);辽宁省教育厅基本科研项目(LZ2019002,LQ2020011)。

摘　　要：采用水热法在不同pH条件下制备了一系列MnO_(2)基催化剂,通过XRD、SEM、N_(2)吸脱附等手段对其进行了表征,并评价了它们对甲苯催化氧化反应的催化活性。表征结果表明,不同的pH本质上改变了s反应溶液的初始H+浓度,从而影响了所得样品的结晶环境,并赋予它们不同的晶相。甲苯的催化氧化评价结果表明,催化剂的催化性能与α-MnO_(2)的含量密切相关。当pH=11时所得到的MnO_(2)-11催化剂,具有最大的比表面积和最多的缺陷结构,使其具有最佳的催化活性(T_(2)=245℃和T_(2)=256℃)和优异的循环稳定性。A series of MnO_(2)catalysts were prepared via a hydrothermal method at different pH,characterized by XRD,SEM,N_(2)-adsorption XPS and H_(2)-TPR,and tested in the total oxidation of toluene.Different pH essentially changes the initial H^(+)concentration of the reaction solution during the synthesis process of different samples,which dramatically affects the crystallization environment of the obtained samples and gives them different crystal phase.The catalytic activity of the as-prepared MnO_(2)catalysts was evaluated by the catalytic oxidation of toluene,and the result illustrates that the catalytic performance of the catalysts is linearly dependent on the content ofα-MnO_(2).When pH=11,the obtained MnO_(2)-11 catalyst has the largest surface area and the most defect structure,which makes it have the best catalytic activity(T_(50)=245℃and T_(90)=256℃)and excellent cycling stability.

关 键 词：MnO_(2)催化剂 催化燃烧 挥发性有机化合物 

分 类 号：TQ032.4[化学工程]