摘要
采用浸渍法将Keggin型结构的磷钨酸负载于活性炭上,制备出负载型催化剂,运用XRD,N2吸附-脱附,FT-IR,TG-DTA等方法对其进行分析。根据分析结果选择催化剂34%PW12/C用于尼泊金丁酯的催化合成,并利用正交试验L9(34)对其主要工艺条件进行优化,结果表明:活性炭及PW12的基本结构均能得到保持,催化剂具有较大的孔径、孔容及比表面积。醇酸摩尔比3∶1,催化剂用量2.5%,反应温度130℃,反应时间3h,酯收率达到86.3%。催化剂重复使用5次,催化性能稳定。
Supported catalysts are prepared using impregnation method by Keggin-type phosphotungstic acid supported on active carbon, and they are analyzed through XRD, N2 adsorption-desorption, FT-IR, TG-DTA methods. According to the analysis results, 34% PW12/C is used for synthesis of butylparaben, and the process conditions are optimized by L9 （34） orthogonal experiments. The results show that the basic structure of active carbon and PW12 are maintained, and the catalysts have large aperture, pore volume and alco 3h, perf Key hol to ester acid of 3 ： 1, the catalys yield could reach 86.3 %. specific surface area. t dosage of 2.5%, rea The optimum condition ction temperature of 130 The catalysts are reused for 5 times, and they s are mole ratio of ℃, reaction time of have stable catalytic ormance.
出处
《中国调味品》
北大核心
2017年第9期80-84,共5页
China Condiment
关键词
浸渍法
磷钨酸
活性炭
负载型催化剂
尼泊金丁酯
impregnation methodl phosphotungstic acid
active carbon
supported catalyst
butylparaben
