TY - JOUR
T1 - Sequential conversion of lignite in alkaline water by oxidative degradation, dissolution and catalytic gasification
AU - Liu, Tianlong
AU - Asano, Shusaku
AU - Kudo, Shinji
AU - Hayashi, Jun ichiro
N1 - Funding Information:
A part of this work was financially supported by The Japan Society for the Promotion of Science (JSPS) for Grant-in-Aid for Scientific Research A (17H01340) and also Grant-Aid for Challenging Research (Pioneering) (17H06225). The authors are also grateful to the Cooperative Research Program of Network Joint Research Center for Materials and Devices that has been supported by Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan. Tianlong Liu acknowledges Junya Tahara for 13C-NMR and LD/MS analyses, and the China Scholarship Council (CSC) with financial support (Grant number; 201706420067).
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/10/15
Y1 - 2020/10/15
N2 - We have demonstrated a sequence of degradation, dissolution and catalytic hydrothermal gasification (CHTG) of lignite in alkaline water. A Victorian lignite was subjected to hydrothermal treatment (HT) in an aqueous solution of NaOH at 250 °C, and then oxidation with pressurized O2 at 100 °C. The sequential HT and oxidation solubilized a 95% portion of the lignite on mass/carbon bases. The resulting solution was further converted by CHTG in a flow reactor at 350 °C for 10 h, employing a ruthenium/activated-charcoal catalyst (ruthenium loading; 16 wt%). The initial carbon conversion to gas was as high as 98% while CH4, CO2 and H2 were produced. The conversion gradually decreased due to coke deposition over the catalyst but was near steady around 83% at 8–10 h. The solubilized lignite consisted of compounds with molecular mass up to 5,000. The heavier portion (molecular mass > 1,000) was responsible for the coke formation and accumulation that caused the catalyst deactivation.
AB - We have demonstrated a sequence of degradation, dissolution and catalytic hydrothermal gasification (CHTG) of lignite in alkaline water. A Victorian lignite was subjected to hydrothermal treatment (HT) in an aqueous solution of NaOH at 250 °C, and then oxidation with pressurized O2 at 100 °C. The sequential HT and oxidation solubilized a 95% portion of the lignite on mass/carbon bases. The resulting solution was further converted by CHTG in a flow reactor at 350 °C for 10 h, employing a ruthenium/activated-charcoal catalyst (ruthenium loading; 16 wt%). The initial carbon conversion to gas was as high as 98% while CH4, CO2 and H2 were produced. The conversion gradually decreased due to coke deposition over the catalyst but was near steady around 83% at 8–10 h. The solubilized lignite consisted of compounds with molecular mass up to 5,000. The heavier portion (molecular mass > 1,000) was responsible for the coke formation and accumulation that caused the catalyst deactivation.
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U2 - 10.1016/j.fuel.2020.118329
DO - 10.1016/j.fuel.2020.118329
M3 - Article
AN - SCOPUS:85086404512
SN - 0016-2361
VL - 278
JO - Fuel
JF - Fuel
M1 - 118329
ER -