铈改性CuMn/Al_(2)O_(3)/堇青石整体催化剂的甲苯催化燃烧性能研究  

Catalytic combustion of toluene over cerium modified CuMn/Al2O3/cordierite monolithic catalyst

作　　者：代宇航 李凯歌 赵金仙 任军[1,2] 权燕红 DAI Yuhang;LI Kaige;ZHAO Jinxian;REN Jun;QUAN Yanhong(State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China;College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学省部共建煤基能源清洁高效利用国家重点实验室,山西太原030024 [2]太原理工大学化学工程与技术学院,山西太原030024

出　　处：《燃料化学学报（中英文）》2024年第1期55-64,共10页Journal of Fuel Chemistry and Technology

摘　　要：本研究以堇青石为载体,采用超声浸渍法制备了一系列CuMnCe_(x)/Al_(2)O_(3)/堇青石整体式催化剂,同时,通过N_(2)吸附-脱附、XRD、SEM、EDX、H_(2)-TPR、O_(2)-TPD、XPS和EPR等方法对样品的物理、化学性质进行了系统的表征分析。实验结果表明,CuMnCe_(x)/Al_(2)O_(3)/堇青石整体式催化剂中的Ce含量明显影响甲苯催化燃烧性能。其中,CuMnCe_(2)/Al_(2)O_(3)/堇青石整体式催化剂对甲苯氧化具有最高活性,当甲苯浓度为1 g/L、空速为78000 mL/(g·h)、温度为263℃时甲苯转化率达到90%,究其原因为CeO_(2)在CuMnO_(x)上分散均匀,不仅提高了氧空位的浓度和氧物种的迁移率,还增强了催化剂的低温还原性。同时,CuMnCe_(2)/Al_(2)O_(3)/堇青石整体式催化剂在长期评价和循环测试中呈现良好的稳定性。Catalytic combustion is an effective approach to remove volatile organic compounds,in which the development of highly active and durable catalyst is extremely crucial.Herein,a series of CuMnCe_(x)/Al_(2)O_(3)/cordierite monolithic catalysts were synthesized by using the ultrasonic-assisted impregnation method.The physicochemical properties were comprehensively characterized via the BET,XRD,SEM,EDX,H2-TPR,O2-TPD,XPS and EPR techniques.The results showed that the catalytic activity of CuMnCe_(x)/Al_(2)O_(3)/Cor for toluene combustion was strongly affected by the Ce content.The CuMnCe_(2)/Al_(2)O_(3)/Cor monolithic catalyst showed the best catalytic activity with toluene conversion of 90%at 263°C under toluene concentration of 1 g/L and space velocity of 78000 mL/(g·h).Meanwhile,the well-dispersed CeO_(2) in the CuMn matrix not only improved the content of oxygen vacancies and the mobility of oxygen species,but also enhanced the low-temperature reducibility of the catalyst.Moreover,the CuMnCe_(2)/Al_(2)O_(3)/Cor monolithic catalyst exhibited an excellent stability in the long-term test and cycle ability test.

关 键 词：甲苯 催化燃烧 整体式催化剂 CuMnCe_(x)复合氧化物 

分 类 号：O643[理学—物理化学]