TY - JOUR
T1 - Hydrothermal catalytic processing of pretreated algal oil
T2 - A catalyst screening study
AU - Bai, Xiujun
AU - Duan, Peigao
AU - Xu, Yuping
AU - Zhang, Aiyun
AU - Savage, Phillip E.
N1 - Funding Information:
We gratefully acknowledge the financial support from the National Science Foundation of China (21106034) and from the Program for New Century Excellent Talents in University (NCET-13-775).
PY - 2014/3/15
Y1 - 2014/3/15
N2 - We herein report on the catalytic processing of pretreated algal oil that was produced from the hydrothermal liquefaction of Chlorella pyrenoidosa. The activities of 5% Pt/C, 5% Pd/C, 5% Ru/C, 5% Pt/C (sulfided), Mo2C, MoS2, alumina, CoMo/γ-Al2O3 (sulfided), Ni/SiO2-Al2O3, HZSM-5, activated carbon, and Raney-Ni for hydrothermal hydrodeoxygenation and hydrodenitrogenation of the pretreated algal oil at 400 C were determined. Ru/C showed the best performance for deoxygenation and Raney-Ni was the most suitable catalyst for denitrogenation. The upgraded oil from the Ru/C catalyzed reaction contained the highest hydrocarbon content, the highest fraction of material boiling below 400 C, and the highest higher heating value (45.1 MJ/kg). All of the metal catalysts produced freely flowing upgraded oil. The combination of Ru/C and Raney Ni, which showed very good deoxygenation and denitrogenation of the oil, produced upgraded oil that retained 86% of the heating value in the original pretreated oil. This upgraded oil was also produced in a higher yield (77.2 wt.%) and with lower gas (9.4 wt.%), coke (15.6 wt.%) and water-soluble products yields (2.1 wt.%) than from either catalyst alone. These results indicate that a two-step biocrude treatment strategy (noncatalytic treatment followed by catalytic upgrading) and a two-component catalyst bed in the second step represents an intriguing option for the hydrothermal catalytic upgrading of algal biocrude.
AB - We herein report on the catalytic processing of pretreated algal oil that was produced from the hydrothermal liquefaction of Chlorella pyrenoidosa. The activities of 5% Pt/C, 5% Pd/C, 5% Ru/C, 5% Pt/C (sulfided), Mo2C, MoS2, alumina, CoMo/γ-Al2O3 (sulfided), Ni/SiO2-Al2O3, HZSM-5, activated carbon, and Raney-Ni for hydrothermal hydrodeoxygenation and hydrodenitrogenation of the pretreated algal oil at 400 C were determined. Ru/C showed the best performance for deoxygenation and Raney-Ni was the most suitable catalyst for denitrogenation. The upgraded oil from the Ru/C catalyzed reaction contained the highest hydrocarbon content, the highest fraction of material boiling below 400 C, and the highest higher heating value (45.1 MJ/kg). All of the metal catalysts produced freely flowing upgraded oil. The combination of Ru/C and Raney Ni, which showed very good deoxygenation and denitrogenation of the oil, produced upgraded oil that retained 86% of the heating value in the original pretreated oil. This upgraded oil was also produced in a higher yield (77.2 wt.%) and with lower gas (9.4 wt.%), coke (15.6 wt.%) and water-soluble products yields (2.1 wt.%) than from either catalyst alone. These results indicate that a two-step biocrude treatment strategy (noncatalytic treatment followed by catalytic upgrading) and a two-component catalyst bed in the second step represents an intriguing option for the hydrothermal catalytic upgrading of algal biocrude.
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U2 - 10.1016/j.fuel.2013.12.012
DO - 10.1016/j.fuel.2013.12.012
M3 - Article
AN - SCOPUS:84891532084
SN - 0016-2361
VL - 120
SP - 141
EP - 149
JO - Fuel
JF - Fuel
ER -