基于泡沫镍的MnO2整体式催化剂构筑及其催化氧化甲苯性能研究  

FABRICATION OF NICKEL FOAM BASED MnO2 MONOLITHIC CATALYSTS AND ITS APPLICATION IN CATALYTIC ELIMINATION OF TOLUENE

作　　者：赵朴臻 柳楚 黄前霖 吕路[1] ZHAO Puzhen;LIU Chu;HUANG Qianlin;LU Lu(State Key Laboratory of Pollution Control and Resource Reuse,School of Environment,Nanjing University,Nanjing 210046,China;Jiujiang Ecological Environment Early Warning Emergency Control Center,Jiujiang 332000,China)

机构地区：[1]南京大学环境学院污染控制与资源化研究国家重点实验室,南京210046 [2]江西省九江市生态环境应急预警管控中心,江西九江332000

出　　处：《环境工程》2023年第4期71-78,115,共9页Environmental Engineering

基　　金：国家重大科技专项(2017ZX07204001)。

摘　　要：开发兼具良好催化活性和优异稳定性的整体式催化剂是VOCs催化燃烧技术工业化应用的关键。传统的整体式催化剂通过在陶瓷载体上进行涂覆、浸渍等工艺制备而成,会导致活性组分分布不均、利用率低甚至失活等问题,从而降低整体式催化剂的性能。因此,利用泡沫镍与KMnO_(4)之间的氧化还原反应,原位合成了MnO_(2)整体式催化剂MnO_(2)/NF-IS,考察了其催化氧化甲苯的性能,并通过XRD、SEM、TEM、H_(2)-TPR、O_(2)-TPD、XPS等手段对催化剂进行表征,并对MnO_(2)/NF-IS催化氧化甲苯的反应路径进行探究。结果表明:基于泡沫镍原位合成的MnO_(2)/NF-IS具有最佳的催化性能(T_(90)=248℃),优于粉末催化剂MnO_(2)(T_(90)=271℃)以及涂覆法制备的整体式催化剂MnO_(2)/NF-WC(T90=293℃)。通过表征发现,MnO_(2)/NF-IS具有特殊的多孔纳米片阵列的形貌和更高的氧空位含量,这可能是其性能优势的重要原因。研究成果为制备基于泡沫镍的MnO_(2)整体式催化剂提供了新思路。The crucial point of the industrial application of VOCs catalytic oxidation is to develop efficient and stable monolithic catalysts.Traditional monolithic catalysts were prepared by coating and impregnating the ceramic carrier,which led to uneven distribution of active components,low utilization rate,and even deactivation,thereby reducing the performance of monolithic catalysts.In this study,a MnO_(2) monolithic catalyst(MnO_(2)/NF-IS)was prepared in situ by the redox reaction between nickel foam and KMnO_(4).The catalytic performance of the as-obtained catalysts for toluene oxidation was investigated.Besides,the catalysts were characterized by XRD,SEM,TEM,H_(2)-TPR,O_(2)-TPD,and XPS,and the degradation pathway of toluene oxidation was investigated.It has been shown that MnO_(2)/NF-IS had a special structure of porous nanosheet arrays and abundant oxygen vacancies,delivering the best performance for toluene oxidation(T_(90)=248℃),which was better than that of powder MnO_(2)(T90=271℃)as well as the integrated MnO_(2)/NF-WC(T_(90)=293℃)prepared by the coating method.Therefore,a new strategy for the synthesis of MnO_(2) monolithic catalysts was provided in this study.

关 键 词：MnO_(2) 泡沫镍 VOCS 催化氧化 纳米阵列 整体式催化剂 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]