FABRICATION OF SOLID ACID CATALYST La,Zn/-Al2O3 FOR THE PREPARATION OF BIODIESEL FROM USED BEEF TALLOW WITH HIGH FREE FATTY ACID
Trần Thị Như Mai
Lưu Văn Bắc
Ngô Minh Đức
Nguyễn Bá Trung
Abstract
The catalytic system La,Zn/γ-Al2O3 was synthesized, and then physically characterized by XRD, TPD- NH3, BET, EDX methods. As seen from results of physical characterization, the synthesized La,Zn/-Al2O3 material owns large surface area of 185.93 m2/g, mean capillary diameter of 13.76 nm, and capillary volume of 0.83 cm³/g. The presence of La, Zn creates strong acid sites on the catalyst surface, corresponding to the NH3 desorption temperature at 519.60C. The transesterification, catalyzed by the above synthesized La,Zn/γ-Al2O3,of methanol with beef tallow at the volumratio of methanol to fat of 4:1was carried out at 65 0C for 8 hours, reaction efficiency was 99%. Key words: Biodiesel; γ-Al2O3; transesterification;mesoporous material; solid acid catalysts