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• W2335248420 startingPage "2389" @default.
• W2335248420 abstract "The challenges with thermal gasification of biomass to produce syngas include high transportation and drying costs of biomass and the need for high-temperature (700–1000 °C) gasifiers and conditioning of the produced gases. Some of these challenges can be addressed by first converting biomass into high-energy-density biochar before transportation and then hydrothermal gasification of biochar at the site of the Fischer–Tropsch plant for liquid fuel synthesis. In this work, a high-energy-density (>27 MJ/kg) biochar is first produced via hydrothermal carbonization of switchgrass at 300 °C, and then the biochar is gasified in hydrothermal medium at 400–650 °C. The carbon gasification efficiency in hydrothermal medium is much better than that in the thermal medium. For example, at 550 °C, only 5.9% carbon gasification was achieved in the thermal medium, as compared to 23.8% in hydrothermal medium. The addition of 25 wt % K2CO3 catalyst enhances the hydrothermal gasification to 43.8%. The gasification can be further enhanced if the biochar is passivated with a small amount of Ca(OH)2 when producing from biomass. With the use of Ca(OH)2 passivation during hydrothermal carbonization and the use of K2CO3 catalysis during hydrothermal gasification, a high carbon gasification efficiency of 75% is achieved at 600 °C, using short reaction times of 5 and 30 min, respectively. With the recycle of the alkali catalyst and passivation agent, the hydrothermal process can provide an attractive alternative to thermal gasification." @default.
• W2335248420 created "2016-06-24" @default.
• W2335248420 creator A5054129199 @default.
• W2335248420 creator A5072054489 @default.
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• W2335248420 date "2011-05-05" @default.
• W2335248420 modified "2023-10-18" @default.
• W2335248420 title "Enhancement of Biochar Gasification in Alkali Hydrothermal Medium by Passivation of Inorganic Components Using Ca(OH)₂" @default.
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• W2335248420 doi "https://doi.org/10.1021/ef200438b" @default.
• W2335248420 hasPublicationYear "2011" @default.
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