In-situ upgrading of bio-tar over Mg-Ni-Mo catalyst supported by KOH treated activated charcoal in supercritical ethanol

Jin Hyuk Lee, In Gu Lee, Ji Yeon Park, Kwan Young Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In-situ catalytic hydrodeoxygenation (HDO) of bio-tar in supercritical ethanol for upgraded biofuel was investigated. Highly mesoporous KOH-treated AC (KOH-AC) was synthesized by chemical activation and used as the support for Ni-based catalysts. Among the tested catalysts (AC, KOH-AC, Mg-Ni-Mo/AC, and Mg-Ni-Mo/KOH-AC), Mg-Ni-Mo/KOH-AC with a high surface area of 1310.1 m 2 /g and a well-developed mesoporous structure exhibited much higher catalytic performance for the HDO of bio-tar. The effects of different reaction temperatures (300–400 °C) and residence time (0–120 min) on the HDO of bio-tar over Mg-Ni-Mo/KOH-AC were also examined. Enhanced properties of liquid fuel with a higher heating value (HHV) of 36.2 MJkg −1 , an oxygen content of 11.7 wt%, and a total acid number (TAN) value of 8.6 mgKOHg −1 were obtained from bio-tar over a Mg-Ni-Mo/KOH-AC at 400 °C for 120 min. In these conditions, acids, aldehydes, and oxygenated phenols present in bio-tar (>67 area%) were effectively converted to high value-added species including aromatics, hydrocarbons, and alkyl phenols in upgraded bio-tar (>77 area%) via esterification, hydrogenation, deoxygenation, and ring-alkylation reactions. A series of Mg-Ni-Mo/KOH-AC catalyst recycle test showed the deposition of coke on the catalyst, which became a major reason for the catalyst deactivation.

Original languageEnglish
Pages (from-to)334-343
Number of pages10
JournalFuel
Volume247
DOIs
Publication statusPublished - 2019 Jul 1

Fingerprint

Tars
Charcoal
Tar
Catalyst supports
Activated carbon
Ethanol
Catalysts
Phenols
Aromatic Hydrocarbons
Catalyst deactivation
Acids
Biofuels
Aromatic hydrocarbons
Alkylation
Liquid fuels
Esterification
Aldehydes
Coke
Hydrogenation
Chemical activation

Keywords

  • Bio-tar
  • High value-added chemicals
  • KOH-treated activated charcoal
  • Mg-Ni-Mo catalyst
  • Supercritical ethanol
  • Upgrading

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Cite this

In-situ upgrading of bio-tar over Mg-Ni-Mo catalyst supported by KOH treated activated charcoal in supercritical ethanol. / Lee, Jin Hyuk; Lee, In Gu; Park, Ji Yeon; Lee, Kwan Young.

In: Fuel, Vol. 247, 01.07.2019, p. 334-343.

Research output: Contribution to journalArticle

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title = "In-situ upgrading of bio-tar over Mg-Ni-Mo catalyst supported by KOH treated activated charcoal in supercritical ethanol",
abstract = "In-situ catalytic hydrodeoxygenation (HDO) of bio-tar in supercritical ethanol for upgraded biofuel was investigated. Highly mesoporous KOH-treated AC (KOH-AC) was synthesized by chemical activation and used as the support for Ni-based catalysts. Among the tested catalysts (AC, KOH-AC, Mg-Ni-Mo/AC, and Mg-Ni-Mo/KOH-AC), Mg-Ni-Mo/KOH-AC with a high surface area of 1310.1 m 2 /g and a well-developed mesoporous structure exhibited much higher catalytic performance for the HDO of bio-tar. The effects of different reaction temperatures (300–400 °C) and residence time (0–120 min) on the HDO of bio-tar over Mg-Ni-Mo/KOH-AC were also examined. Enhanced properties of liquid fuel with a higher heating value (HHV) of 36.2 MJkg −1 , an oxygen content of 11.7 wt{\%}, and a total acid number (TAN) value of 8.6 mgKOHg −1 were obtained from bio-tar over a Mg-Ni-Mo/KOH-AC at 400 °C for 120 min. In these conditions, acids, aldehydes, and oxygenated phenols present in bio-tar (>67 area{\%}) were effectively converted to high value-added species including aromatics, hydrocarbons, and alkyl phenols in upgraded bio-tar (>77 area{\%}) via esterification, hydrogenation, deoxygenation, and ring-alkylation reactions. A series of Mg-Ni-Mo/KOH-AC catalyst recycle test showed the deposition of coke on the catalyst, which became a major reason for the catalyst deactivation.",
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T1 - In-situ upgrading of bio-tar over Mg-Ni-Mo catalyst supported by KOH treated activated charcoal in supercritical ethanol

AU - Lee, Jin Hyuk

AU - Lee, In Gu

AU - Park, Ji Yeon

AU - Lee, Kwan Young

PY - 2019/7/1

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N2 - In-situ catalytic hydrodeoxygenation (HDO) of bio-tar in supercritical ethanol for upgraded biofuel was investigated. Highly mesoporous KOH-treated AC (KOH-AC) was synthesized by chemical activation and used as the support for Ni-based catalysts. Among the tested catalysts (AC, KOH-AC, Mg-Ni-Mo/AC, and Mg-Ni-Mo/KOH-AC), Mg-Ni-Mo/KOH-AC with a high surface area of 1310.1 m 2 /g and a well-developed mesoporous structure exhibited much higher catalytic performance for the HDO of bio-tar. The effects of different reaction temperatures (300–400 °C) and residence time (0–120 min) on the HDO of bio-tar over Mg-Ni-Mo/KOH-AC were also examined. Enhanced properties of liquid fuel with a higher heating value (HHV) of 36.2 MJkg −1 , an oxygen content of 11.7 wt%, and a total acid number (TAN) value of 8.6 mgKOHg −1 were obtained from bio-tar over a Mg-Ni-Mo/KOH-AC at 400 °C for 120 min. In these conditions, acids, aldehydes, and oxygenated phenols present in bio-tar (>67 area%) were effectively converted to high value-added species including aromatics, hydrocarbons, and alkyl phenols in upgraded bio-tar (>77 area%) via esterification, hydrogenation, deoxygenation, and ring-alkylation reactions. A series of Mg-Ni-Mo/KOH-AC catalyst recycle test showed the deposition of coke on the catalyst, which became a major reason for the catalyst deactivation.

AB - In-situ catalytic hydrodeoxygenation (HDO) of bio-tar in supercritical ethanol for upgraded biofuel was investigated. Highly mesoporous KOH-treated AC (KOH-AC) was synthesized by chemical activation and used as the support for Ni-based catalysts. Among the tested catalysts (AC, KOH-AC, Mg-Ni-Mo/AC, and Mg-Ni-Mo/KOH-AC), Mg-Ni-Mo/KOH-AC with a high surface area of 1310.1 m 2 /g and a well-developed mesoporous structure exhibited much higher catalytic performance for the HDO of bio-tar. The effects of different reaction temperatures (300–400 °C) and residence time (0–120 min) on the HDO of bio-tar over Mg-Ni-Mo/KOH-AC were also examined. Enhanced properties of liquid fuel with a higher heating value (HHV) of 36.2 MJkg −1 , an oxygen content of 11.7 wt%, and a total acid number (TAN) value of 8.6 mgKOHg −1 were obtained from bio-tar over a Mg-Ni-Mo/KOH-AC at 400 °C for 120 min. In these conditions, acids, aldehydes, and oxygenated phenols present in bio-tar (>67 area%) were effectively converted to high value-added species including aromatics, hydrocarbons, and alkyl phenols in upgraded bio-tar (>77 area%) via esterification, hydrogenation, deoxygenation, and ring-alkylation reactions. A series of Mg-Ni-Mo/KOH-AC catalyst recycle test showed the deposition of coke on the catalyst, which became a major reason for the catalyst deactivation.

KW - Bio-tar

KW - High value-added chemicals

KW - KOH-treated activated charcoal

KW - Mg-Ni-Mo catalyst

KW - Supercritical ethanol

KW - Upgrading

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