TY - JOUR
T1 - Biodiesel synthesis using calcined layered double hydroxide catalysts
AU - Shumaker, J. Link
AU - Crofcheck, Czarena
AU - Tackett, S. Adam
AU - Santillan-Jimenez, Eduardo
AU - Morgan, Tonya
AU - Ji, Yaying
AU - Crocker, Mark
AU - Toops, Todd J.
PY - 2008/7/16
Y1 - 2008/7/16
N2 - The catalytic properties of calcined Li-Al, Mg-Al and Mg-Fe layered double hydroxides (LDHs) were examined in two transesterification reactions, namely, the reaction of glyceryl tributyrate with methanol and the reaction of soybean oil with methanol. While the Li-Al catalysts showed high activity in these reactions at the reflux temperature of methanol, the Mg-Fe and Mg-Al catalysts exhibited much lower methyl ester yields. CO2 TPD measurements revealed the presence of sites of weak, medium and strong basicity on both Mg-Al and Li-Al catalysts, the latter showing higher concentrations of medium and strong base sites; by implication, these are the main sites active in transesterification catalyzed by calcined Li-Al LDHs. Maximum activity was observed for the Li-Al catalysts when a calcination temperature of 450-500 °C was applied, corresponding to decomposition of the layered double hydroxide to the mixed oxide without formation of crystalline lithium aluminate phases.
AB - The catalytic properties of calcined Li-Al, Mg-Al and Mg-Fe layered double hydroxides (LDHs) were examined in two transesterification reactions, namely, the reaction of glyceryl tributyrate with methanol and the reaction of soybean oil with methanol. While the Li-Al catalysts showed high activity in these reactions at the reflux temperature of methanol, the Mg-Fe and Mg-Al catalysts exhibited much lower methyl ester yields. CO2 TPD measurements revealed the presence of sites of weak, medium and strong basicity on both Mg-Al and Li-Al catalysts, the latter showing higher concentrations of medium and strong base sites; by implication, these are the main sites active in transesterification catalyzed by calcined Li-Al LDHs. Maximum activity was observed for the Li-Al catalysts when a calcination temperature of 450-500 °C was applied, corresponding to decomposition of the layered double hydroxide to the mixed oxide without formation of crystalline lithium aluminate phases.
KW - Aluminum
KW - Layered double hydroxide
KW - Lithium
KW - Transesterification
KW - Triglyceride
UR - http://www.scopus.com/inward/record.url?scp=44749089186&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2008.01.010
DO - 10.1016/j.apcatb.2008.01.010
M3 - Article
AN - SCOPUS:44749089186
SN - 0926-3373
VL - 82
SP - 120
EP - 130
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
IS - 1-2
ER -
