摘要
采用共沉淀、高温焙烧及KF掺杂Zn-Al类水滑石的方法制备了KF/Zn-Al固体碱催化剂。通过正交试验考察了制备条件对KF/Zn-Al固体碱催化活性的影响,得到的优化条件为:陈化温度353 K、陈化时间16 h、焙烧温度823 K、焙烧时间6 h及m(KF)/m(Zn-Al)=1。以优化条件下制备的KF/Zn-Al固体碱为催化剂,在n(醇)/n(油)=9、m(催化剂)/m(油)=0.04、反应温度338 K、反应时间0.5 h的条件下,菜籽油转化率可达97.75%。采用TG-DTG、BET、XRD、SEM技术及Hammett指示剂法对催化剂及其前驱体进行了表征。对催化剂结构及表面性质与其活性之间的关系进行了讨论。
KF/Zn-Al solid base catalyst was prepared by coprecipitation and calcination by doping KF on calcined Zn-Al hydrotaleite-like compounds. Effects of different preparation conditions on the catalytic activity of the KF/Zn-Al solid base were investigated through orthogonal experiments. The optimal condition was obtained at aging temperature of 353 K, aging time of 16 h, calcination temperature of 823 K, calcination time of 6 h and KF/Zn-Al mass ratio of 1. When the reaction was carried out at 338 K for 0. 5 h with alcohol/oil molar ratio of 9, catalyst/oil mass ratio of 0. 04, rapeseed oil conversion could reach 97.75 % in the presence of the KF/Zn-Al catalyst prepared at optimal conditions. The catalyst and its precursor were characterized using TG-DTG, BET, XRD, SEM and Hammett indicator method. Relationship between the structure and the surface properties of the catalyst and its activity was discussed.
出处
《应用化学》
CAS
CSCD
北大核心
2013年第11期1319-1325,共7页
Chinese Journal of Applied Chemistry
基金
山西省高校科技开发项目(2010130)
关键词
类水滑石
复合氧化物
固体碱
催化剂
生物柴油
hydrotalcite-like compound, complex oxide, solid base, catalyst, biodiesel
