摘要
以经过预处理的活性氧化铝为载体,铜、镍为主要活性组分,锌、镁为催化剂助剂,分别采用常规浸渍法和超声浸渍法制备Cu-Ni-Zn-Mg/Al2O3负载型吗啉催化剂,通过ICP、XRD、BET和SEM等手段对催化剂的理化性质进行表征,将所制得的催化剂应用于二甘醇(DEG)气相法连续合成吗啉的反应中评价其催化活性。结果表明:相比于常规浸渍法,超声辅助浸渍法制备的吗啉催化剂具有更大的比表面积,其主要活性组分铜和镍的负载量增大并能更好地分散于载体中,催化剂活性明显提高。在反应温度230℃、压力1.7MPa、二甘醇空速0.15h-1、氨醇比5∶1时,新方法二甘醇的转化率达到99.67%,吗啉收率达到90.04%,比传统法二甘醇的转化率提高了19.86%,吗啉的收率提高了27.01%。
Cu-Ni-Zn-Mg/Al2O3 catalyst for morpholine synthesis was prepared by impregnation with and without ultrasonic treatment while the activated alumina used as the carrier,copper and nickel as the main active components,and zinc and magnesium as catalyst additives. The physicochemical properties and microstructure of the catalyst were analyzed by ICP,XRD,SEM and BET. The prepared catalysts were used for producing morpholine continuously through the catalytic aminolysis of diethylene glycol in vapor phase. Compared to the conventional impregnation method,the catalyst prepared by ultrasound-assisted impregnation method had larger surface area,the main active component loadings of copper and nickel were increased,and active ingredients could be better dispersed in the carrier. Under the condition of 230℃,1.8MPa,0.15h^-1,and the molar ratio of ammonia to diethylene glycol as 5∶1,the conversion of diethylene glycol and yield of morpholine reached 99.87% and 91.22% by new method,which was 19.86% and 27.01% higher than that by traditional method,respectively.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2015年第2期425-429,446,共6页
Chemical Industry and Engineering Progress
基金
广西科学研究与技术开发计划项目(桂科攻1140001-33)
关键词
超声辐射
浸渍法
催化剂
吗啉
ultrasonic irradiation
impregnation
catalyst
morpholine
