摘要
利用水热法合成Co_(3)O_(4)/USY复合材料,研究其对有机污染物甲苯的吸附和催化氧化特性,同时结合微波对Co_(3)O_(4)的精准加热特性,考察不同负载量Co_(3)O_(4)/USY在微波作用下的升温特性及催化甲苯氧化降解特性。结果表明,通过水热反应,Co_(3)O_(4)在USY表面形成多孔蜂窝状结构;负载Co_(3)O_(4)后的USY保持较高的吸附容量,Co_(3)O_(4)/USY-1.5m室温下的吸附容量为85 mg/g;Co_(3)O_(4)/USY在干、湿两种状态下均在325℃表现出优良的催化氧化特性、CO 2选择性和稳定性;Co_(3)O_(4)/USY能够与微波高效耦合,快速升温启动其催化作用,控制反应温度为250℃,发现微波诱导甲苯催化氧化过程的CO 2选择性优于常规催化,表明所制备Co_(3)O_(4)/USY复合材料具备吸附甲苯并进行微波快速再生协同有机污染物高效催化氧化降解的可行性。
Co_(3)O_(4)/USY composite material was synthesized by a hydrothermal method.Experimental study was conducted to investigate its absorption and catalytic oxidation characteristics of organic pollutant toluene.Since the Co_(3)O_(4) can be efficiently heated by microwaves,the heating characteristics and catalytic oxidation of toluene on Co_(3)O_(4) modified USY under microwave action were also investigated,with an aim to discuss the feasibility of microwave-assisted rapid regeneration of adsorbent whilst in-situ degradation of organic matter.By hydrothermal reaction,Co_(3)O_(4) forms a porous cellular structure on the surface of USY.The USY loaded with Co_(3)O_(4) maintains high adsorption capacity,and the adsorption capacity of Co_(3)O_(4)/USY-1.5m at room temperature is 85 mg/g.The prepared Co_(3)O_(4)/USY composite material exhibits excellent catalytic oxidation properties,CO 2 selectivity and stability at 325℃in both dry and wet conditions.The prepared Co_(3)O_(4)/USY composite material can couple with microwave in an efficient way,leading to quick start up its catalytic function.Comparative study shows that the CO 2 selectivity and catalysis stability under the microwave heating scenario are better than conventional heating when the reaction temperature is controlled at 250℃.The above results indicate that the prepared Co_(3)O_(4)/USY composite material can be used as an adsorbent to adsorb toluene and regenerated by microwave heating whilst the desorbed organic matter can be efficiently degraded by in situ catalytic oxidation.
作者
孙静
董一霖
李法齐
李文翔
马晓玲
王文龙
SUN Jing;DONG Yilin;LI Faqi;LI Wenxiang;MA Xiaoling;WANG Wenlong(National Engineering Laboratory for Reducing Emissions from Coal Combustion,Engineering Research Center of Environmental Thermal Technology of Ministry of Education,Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization,School of Energy and Power Engineering,Shandong University,Jinan 250061,Shandong,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第6期3306-3315,共10页
CIESC Journal
基金
国家重点研发计划项目(2018YFB0605200)
山东大学青年学者未来计划项目(2018WLJH75)。
