TY - JOUR
T1 - Catalytic supercritical water gasification of aqueous phase directly derived from microalgae hydrothermal liquefaction
AU - Xu, Donghai
AU - Liu, Liang
AU - Wei, Ning
AU - Guo, Yang
AU - Wang, Shuzhong
AU - Wu, Zhiqiang
AU - Duan, Peigao
N1 - Publisher Copyright:
© 2019 Hydrogen Energy Publications LLC
PY - 2019/10/8
Y1 - 2019/10/8
N2 - Microalgae (N. chlorella) hydrothermal liquefaction (HTL) was conducted at 320 °C for 30 min to directly obtain original aqueous phase with a solvent-free separation method, and then the supercritical water gasification (SCWG) experiments of the aqueous phase were performed at 450 and 500 °C for 10 min with different catalysts (i.e., Pt-Pd/C, Ru/C, Pd/C, Na2CO3 and NaOH). The results show that increasing temperature from 450 to 500 °C could improve H2 yield and TGE (total gasification efficiency), CGE (carbon gasification efficiency), HGE (hydrogen gasification efficiency), TOC (total organic carbon) removal efficiency and tar removal efficiency. The catalytic activity order in improving the H2 yield was NaOH > Na2CO3 > None > Pd/C > Pt-Pd/C > Ru/C. Ru/C produced the highest CH4 mole fraction, TGE, CGE, TOC removal efficiency and tar removal efficiency, while NaOH led to the highest H2 mole fraction, H2 yield and HGE at 500 °C. Increasing temperature and adding proper catalyst could remarkably improve the SCWG process above, but some N-containing compounds were difficult to be gasified. This information is valuable for guiding the treatment of the aqueous phase derived from microalgae HTL.
AB - Microalgae (N. chlorella) hydrothermal liquefaction (HTL) was conducted at 320 °C for 30 min to directly obtain original aqueous phase with a solvent-free separation method, and then the supercritical water gasification (SCWG) experiments of the aqueous phase were performed at 450 and 500 °C for 10 min with different catalysts (i.e., Pt-Pd/C, Ru/C, Pd/C, Na2CO3 and NaOH). The results show that increasing temperature from 450 to 500 °C could improve H2 yield and TGE (total gasification efficiency), CGE (carbon gasification efficiency), HGE (hydrogen gasification efficiency), TOC (total organic carbon) removal efficiency and tar removal efficiency. The catalytic activity order in improving the H2 yield was NaOH > Na2CO3 > None > Pd/C > Pt-Pd/C > Ru/C. Ru/C produced the highest CH4 mole fraction, TGE, CGE, TOC removal efficiency and tar removal efficiency, while NaOH led to the highest H2 mole fraction, H2 yield and HGE at 500 °C. Increasing temperature and adding proper catalyst could remarkably improve the SCWG process above, but some N-containing compounds were difficult to be gasified. This information is valuable for guiding the treatment of the aqueous phase derived from microalgae HTL.
KW - Aqueous phase
KW - Catalyst
KW - Hydrogen
KW - Hydrothermal liquefaction
KW - Microalgae
KW - Supercritical water gasification
UR - https://www.scopus.com/pages/publications/85071855280
U2 - 10.1016/j.ijhydene.2019.08.106
DO - 10.1016/j.ijhydene.2019.08.106
M3 - 文章
AN - SCOPUS:85071855280
SN - 0360-3199
VL - 44
SP - 26181
EP - 26192
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 48
ER -
