Ag/SiO_(2)催化剂用于甲氧基丙醇氧化反应  

Ag/SiO_(2)catalysts for oxidation of methoxypropanol

作　　者：赵鹬[1,2] 张玉蓉 毛绍祺 李宁 张栋强[1,2] 赵仕玲 ZHAO Yu;ZHANG Yurong;MAO Shaoqi;LI Ning;ZHANG Dongqiang;ZHAO Shiling(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]甘肃省低碳能源化工重点实验室,甘肃兰州730050

出　　处：《精细化工》2025年第4期865-871,共7页Fine Chemicals

基　　金：兰州市科技计划项目(2023-3-68)。

摘　　要：采用等体积浸渍法制备一系列Ag/SiO_(2)催化剂。采用XRD、SEM、TEM、O_(2)-TPD对其进行了表征,评价了其对1-甲氧基-2-丙醇(MOP)的催化氧化性能,考察了Ag理论负载量(以SiO_(2)质量计,下同)对Ag/SiO_(2)催化剂催化性能的影响,并对15%Cu/SiO_(2)(Cu的理论负载量为15%,以SiO_(2)质量计)和15%Ag/SiO_(2)的微观形貌和催化性能进行了对比。结果表明,15%Ag/SiO_(2)具有较高的催化活性,在反应温度300℃、液时空速1.8 mL/(g·h)、体积空气流量80 mL/min的条件下,催化剂能稳定运行72 h,其中在反应8~20 h期间,MOP转化率平均为95.05%,目标产物甲氧基丙酮的选择性平均为85.07%;15%Ag/SiO_(2)在反应80 h后,积炭率达到13.5%;与15%Cu/SiO_(2)的Cu物种平均粒径(约15.2 nm)相比,15%Ag/SiO_(2)具有更小的Ag物种平均粒径(3.1 nm),分散性更好;Ag的氧吸附类型和高度分散是MOP在Ag/SiO_(2)催化剂上氧化的重要因素,Ag与SiO_(2)载体的强相互作用和良好的抗积炭能力为催化剂的稳定性提供了有利条件。A series of Ag/SiO_(2)catalysts were prepared by equal volume impregnation method,characterized by XRD,SEM,TEM and O_(2)-TPD,and evaluated for their catalytic oxidation performance on 1-methoxy-2-propanol(MOP).The effect of Ag theoretical loading(based on the mass of SiO_(2),the same below)on the Ag/SiO_(2)catalytic performance was analyzed,while the micromorphology and catalytic properties of 15%Cu/SiO_(2)(theoretical load of Cu was 15%,based on the mass of SiO_(2))and those of 15%Ag/SiO_(2)were compared.The results showed that 15%Ag/SiO_(2)exhibited high catalytic activity.Under the conditions of reaction temperature 300℃,liquid space velocity 1.8 mL/(g·h)and volume air flow rate 80 mL/min,the operation was stable for 72 h,during reaction for 8~20 h,the average conversion rate of MOP was 95.05%,the average selectivity of the target product methoxyacetone was 85.07%.After the reaction of 15%Ag/SiO_(2)for 80 h,the carbon deposition rate reached 13.5%.Compared with the average particle size of 15%Cu/SiO_(2)Cu species(about 15.2 nm),15%Ag/SiO_(2)displayed a smaller average particle size(3.1 nm)of Ag species and better dispersion.The oxygen adsorption type and high dispersion of Ag in Ag/SiO_(2)catalyst were important factors for the oxidation of MOP The strong interaction between Ag and SiO_(2)carrier and good anti-carbon deposition ability provided favorable conditions for the stability of the catalyst.

关 键 词：浸渍法 银基催化剂 纳米粒子 二氧化硅 甲氧基丙酮 吸附 

分 类 号：TQ224.223[化学工程—有机化工] TQ426