原位水热法合成介孔LaCoO_3/MCF催化剂用于CO氧化反应  

In situ Hydrothermal Synthesis of Mesoporous LaCoO_3/ MCF Catalysts for CO Oxidation Reaction

作　　者：李金林[1] 龚渺 赵福真[1] 向勇[1] 韦良[1] 张煜华[1] 

机构地区：[1]中南民族大学催化材料科学湖北省暨国家民委-教育部重点实验室,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2016年第1期7-11,共5页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(21303272)

摘　　要：采用原位水热法制备了LaCoO3/MCF、LaCoO3/SBA-15催化剂,分别采用XRD、氮气物理吸附-脱附、TEM对催化剂进行了表征,并在固定床反应器中对催化剂的CO氧化反应活性进行了测试,考察了不同LaCoO3负载量和不同载体负载的催化剂的CO氧化性能.结果表明：原位水热合成法制备的LaCoO3/MCF催化剂具有较高的比表面积（281.1～427.6 m2·g^（-1））和三维介孔泡沫状孔道结构,LaCoO3纳米颗粒均匀地分散在催化剂中. LaCoO3的含量显著影响催化剂的CO氧化反应活性,负载量为30%的催化剂（30LaCoO3/MCF）的反应活性最高,CO在387℃氧化完全.与SBA-15负载的催化剂相比,由于 MCF 的三维互通结构,催化剂30LaCoO3/MCF 的催化性能明显提高.LaCoO3/MCF and LaCoO3/SBA-15 catalysts were prepared by in situ hydrothermally method. The catalysts were characterized by X-ray diffraction, nitrogen absorption-desorption and TEM. The oxidation of CO was tested on a fixed bed reactor. The influence of the loading of LaCoO3 and the type of carrier were investigated. The results showed that the LaCoO3/MCF catalysts had large surface area （281. 1 ～ 427. 6 m2 ·g^（-1）） and well retained 3-D mesoporous foamy channels. The nano-sized LaCoO3 particles were uniformly dispersed in the catalyst. It also showed that the content of LaCoO3 had significant effect on the oxidation of CO. The 30LaCoO3/MCF catalyst , with 30%（ mass fraction） load of LaCoO3 on MCF, showed the best activity and CO was oxidated completely up to 387℃. Compared with the 30LaCoO3/SBA-15, the 30LaCoO3/MCF catalyst had better catalytic property due to the 3-D interflow channels of MCF.

关 键 词：CO 氧化反应 介孔二氧化硅泡沫 LACOO3 原位水热法 

分 类 号：TQ032[化学工程] O643.36[理学—物理化学]