Mn/Cr_(2)O_(3)催化剂的甲苯催化氧化性能研究  

STUDY ON THE PERFORMANCE OF Mn Cr_(2)O_(3) CATALYSTS FORCATALYTIC OXIDATION OF TOLUENE

作　　者：丁晨宇 张羽 黄利宏[2] 王宁[1] Ding Chenyu;Zhang Yu;Huang Lihong;Wang Ning(Faculty of Environment and Life,Beijing University of Technology,Beijing 100124;College of Materials and Chemistry&Chemical Engineering,Chengdu University of Technology)

机构地区：[1]北京工业大学环境与生命学部,北京100124 [2]成都理工大学材料与化学化工学院

出　　处：《石油炼制与化工》2024年第5期45-52,共8页Petroleum Processing and Petrochemicals

基　　金：地质灾害与地质保护国家重点实验室自主研究项目(SKLGP2021Z015);国家自然科学基金项目(22278008);北京市自然科学基金项目(2232001)。

摘　　要：为了解决挥发性有机化合物(VOCs)燃烧处理效率低的问题,通过水热合成法制备了Cr_(2)O_(3)纳米粒子,再以浸渍法负载Mn组分,得到系列Mn Cr_(2)O_(3)催化剂,表征了其物理化学性质,评价了其催化甲苯氧化反应的性能。结果表明:相较于Cr_(2)O_(3)催化剂,MnO_(x)的负载在诱导铬基载体产生有序介孔结构的同时,增大了催化剂的比表面积,有效提高了活性MnO_(x)的分散度,维持了Mn Cr_(2)O_(3)催化剂的结构稳定性,解决了活性组分易聚集失活的问题;当Mn质量分数为20%时,Mn Cr_(2)O_(3)催化剂展现出最高活性,甲苯转化率为50%,90%,100%时温度分别为210,229,240℃;同时,该催化剂在240℃、50 h的稳定性测试中,甲苯转化率能够保持在100%,这说明通过控制Mn组分的掺入量,能够有效调控系列Mn Cr_(2)O_(3)催化剂的孔道结构、金属-载体间的相互作用及抗积炭能力,以期进一步优化催化性能。In order to improve the inefficiency of volatile organic compound(VOCs)combustion processing,Cr_(2)O_(3) nano-particles were prepared by using a hydrothermal synthesis method and subsequently used as carrier to load manganese through impregnation method,leading to the development of a series of Mn Cr_(2)O_(3) catalysts.The physical and chemical properties of the catalysts were characterized,and the catalytic oxidation performance for toluene was evaluated.The corresponding results indicated that the introduction of MnO_(x) onto Cr_(2)O_(3) not only instigated the creation of an organized mesoporous structure within the chromium-based support,but also markedly increased the specific surface area.This enhancement facilitated the dispersion of active MnO x,maintained the stable structure of Mn Cr_(2)O_(3) catalysts,and resolved the issue of aggregation-induced deactivation of the active components.When Mn content was 20%,Mn Cr_(2)O_(3) catalyst exhibited the highest activity,and the temperatures for the toluene conversion reaching 50%,90% and 100%,were 210,229 and 240℃,respectively.Moreover,the toluene conversion could be maintained at 100%at 240℃ in 50 h stability test.The results demonstrated that by controlling the amount of Mn species incorporated,it was possible to effectively modulate the pore structure of the Mn Cr_(2)O_(3) catalysts,the interactions between the metal and support and the ability to eliminate coke deposition.

关 键 词：甲苯 催化氧化 铬基催化剂 纳米氧化铬 

分 类 号：TQ426[化学工程] TQ241.12