TY - JOUR
T1 - Heterogeneous catalytic esterification of oleic acid under sub/supercritical methanol over γ-Al2O3
AU - Zhang, Jie
AU - Liu, Jiuxu
AU - Huang, Xinlei
AU - Choi, Seungrag
AU - Zhu, Ran
AU - Tang, Siqi
AU - Bond, Jesse Q.
AU - Tavlarides, Lawrence L.
N1 - Funding Information:
The authors are grateful to Syracuse University, College of Engineering and Computer Science for financial support. The authors are also grateful to Hansheng Li and Prof. Viktor J. Cybulskis in Syracuse University for XRD analysis. And the author Jie Zhang is grateful to China Scholarship Council (grant ID: 201808610057 ) who sponsors her as a visiting scholar to study at Syracuse University.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/5/15
Y1 - 2020/5/15
N2 - A continuous pack-bed reactor experimental system was employed to investigate the heterogeneous catalytic esterification of oleic acid and sub/supercritical methanol with γ-Al2O3 as the catalyst. The experiment conditions were pressure of 10–20 MPa, temperature of 175–325 °C, residence time of 0.2–7 min and methanol/oil molar ratio of 20:1. A global one-step second order reversible kinetic model and a three-step Eley-Rideal mechanism model were proposed. The influence of impurity water and reaction pressure on the supercritical heterogeneous catalytic reaction were examined, and the stability of γ-Al2O3 under supercritical conditions was also evaluated. It was found that γ-Al2O3 showed excellent catalytic performance in both subcritical and supercritical processes, promoting theoretical maximum biodiesel yield at 20 MPa, 275 °C in 1 min. The impurity water hindered the conversion of biodiesel due to its negative influence on both the esterification reaction and the catalyst. Finally, the stability of γ-Al2O3 was tested under supercritical condition for 30 h.
AB - A continuous pack-bed reactor experimental system was employed to investigate the heterogeneous catalytic esterification of oleic acid and sub/supercritical methanol with γ-Al2O3 as the catalyst. The experiment conditions were pressure of 10–20 MPa, temperature of 175–325 °C, residence time of 0.2–7 min and methanol/oil molar ratio of 20:1. A global one-step second order reversible kinetic model and a three-step Eley-Rideal mechanism model were proposed. The influence of impurity water and reaction pressure on the supercritical heterogeneous catalytic reaction were examined, and the stability of γ-Al2O3 under supercritical conditions was also evaluated. It was found that γ-Al2O3 showed excellent catalytic performance in both subcritical and supercritical processes, promoting theoretical maximum biodiesel yield at 20 MPa, 275 °C in 1 min. The impurity water hindered the conversion of biodiesel due to its negative influence on both the esterification reaction and the catalyst. Finally, the stability of γ-Al2O3 was tested under supercritical condition for 30 h.
KW - Esterification
KW - Heterogeneous catalysis
KW - Oleic acid
KW - γ-AlO
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U2 - 10.1016/j.fuel.2020.117359
DO - 10.1016/j.fuel.2020.117359
M3 - Article
AN - SCOPUS:85079646487
SN - 0016-2361
VL - 268
JO - Fuel
JF - Fuel
M1 - 117359
ER -