Catalytic upgrading of bio-oil produced from hydrothermal liquefaction of Nannochloropsis sp.

Rajdeep Shakya; Sushil Adhikari; Ravishankar Mahadevan; El Barbary Hassan; Thomas Dempster

doi:10.1016/j.biortech.2017.12.067

Catalytic upgrading of bio-oil produced from hydrothermal liquefaction of Nannochloropsis sp.

Rajdeep Shakya, Sushil Adhikari, Ravishankar Mahadevan, El Barbary Hassan, Thomas Dempster

Research output: Contribution to journal › Article › peer-review

70 Scopus citations

Abstract

Upgrading of bio-oil obtained from hydrothermal liquefaction (HTL) of algae is necessary for it to be used as a fuel. In this study, bio-oil obtained from HTL of Nannochloropsis sp. was upgraded using five different catalysts (Ni/C, ZSM-5, Ni/ZSM-5, Ru/C and Pt/C) at 300 °C and 350 °C. The upgraded bio-oil yields were higher at 300 °C; however, higher quality upgraded bio-oils were obtained at 350 °C. Ni/C gave the maximum upgraded bio-oil yield (61 wt%) at 350 °C. However, noble metal catalysts (Ru/C and Pt/C) gave the better upgraded bio-oils in terms of acidity, heating values, and nitrogen values. The higher heating value of the upgraded bio-oils ranged from 40 to 44 MJ/kg, and the nitrogen content decreased from 5.37 to 1.29 wt%. Most of the upgraded bio-oils (35–40 wt%) were in the diesel range. The major components present in the gaseous products were CH₄, CO, CO₂ and lower alkanes.

Original language	English (US)
Pages (from-to)	28-36
Number of pages	9
Journal	Bioresource Technology
Volume	252
DOIs	https://doi.org/10.1016/j.biortech.2017.12.067
State	Published - Mar 2018

Keywords

Algae
Bio-oil
Catalytic upgrading
Hydrodenitrogenation
Hydrothermal liquefaction

ASJC Scopus subject areas

Bioengineering
Environmental Engineering
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

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10.1016/j.biortech.2017.12.067

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title = "Catalytic upgrading of bio-oil produced from hydrothermal liquefaction of Nannochloropsis sp.",

abstract = "Upgrading of bio-oil obtained from hydrothermal liquefaction (HTL) of algae is necessary for it to be used as a fuel. In this study, bio-oil obtained from HTL of Nannochloropsis sp. was upgraded using five different catalysts (Ni/C, ZSM-5, Ni/ZSM-5, Ru/C and Pt/C) at 300 °C and 350 °C. The upgraded bio-oil yields were higher at 300 °C; however, higher quality upgraded bio-oils were obtained at 350 °C. Ni/C gave the maximum upgraded bio-oil yield (61 wt%) at 350 °C. However, noble metal catalysts (Ru/C and Pt/C) gave the better upgraded bio-oils in terms of acidity, heating values, and nitrogen values. The higher heating value of the upgraded bio-oils ranged from 40 to 44 MJ/kg, and the nitrogen content decreased from 5.37 to 1.29 wt%. Most of the upgraded bio-oils (35–40 wt%) were in the diesel range. The major components present in the gaseous products were CH4, CO, CO2 and lower alkanes.",

keywords = "Algae, Bio-oil, Catalytic upgrading, Hydrodenitrogenation, Hydrothermal liquefaction",

author = "Rajdeep Shakya and Sushil Adhikari and Ravishankar Mahadevan and Hassan, {El Barbary} and Thomas Dempster",

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AU - Shakya, Rajdeep

AU - Adhikari, Sushil

AU - Mahadevan, Ravishankar

AU - Hassan, El Barbary

AU - Dempster, Thomas

PY - 2018/3

Y1 - 2018/3

N2 - Upgrading of bio-oil obtained from hydrothermal liquefaction (HTL) of algae is necessary for it to be used as a fuel. In this study, bio-oil obtained from HTL of Nannochloropsis sp. was upgraded using five different catalysts (Ni/C, ZSM-5, Ni/ZSM-5, Ru/C and Pt/C) at 300 °C and 350 °C. The upgraded bio-oil yields were higher at 300 °C; however, higher quality upgraded bio-oils were obtained at 350 °C. Ni/C gave the maximum upgraded bio-oil yield (61 wt%) at 350 °C. However, noble metal catalysts (Ru/C and Pt/C) gave the better upgraded bio-oils in terms of acidity, heating values, and nitrogen values. The higher heating value of the upgraded bio-oils ranged from 40 to 44 MJ/kg, and the nitrogen content decreased from 5.37 to 1.29 wt%. Most of the upgraded bio-oils (35–40 wt%) were in the diesel range. The major components present in the gaseous products were CH4, CO, CO2 and lower alkanes.

AB - Upgrading of bio-oil obtained from hydrothermal liquefaction (HTL) of algae is necessary for it to be used as a fuel. In this study, bio-oil obtained from HTL of Nannochloropsis sp. was upgraded using five different catalysts (Ni/C, ZSM-5, Ni/ZSM-5, Ru/C and Pt/C) at 300 °C and 350 °C. The upgraded bio-oil yields were higher at 300 °C; however, higher quality upgraded bio-oils were obtained at 350 °C. Ni/C gave the maximum upgraded bio-oil yield (61 wt%) at 350 °C. However, noble metal catalysts (Ru/C and Pt/C) gave the better upgraded bio-oils in terms of acidity, heating values, and nitrogen values. The higher heating value of the upgraded bio-oils ranged from 40 to 44 MJ/kg, and the nitrogen content decreased from 5.37 to 1.29 wt%. Most of the upgraded bio-oils (35–40 wt%) were in the diesel range. The major components present in the gaseous products were CH4, CO, CO2 and lower alkanes.

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KW - Catalytic upgrading

KW - Hydrodenitrogenation

KW - Hydrothermal liquefaction

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Catalytic upgrading of bio-oil produced from hydrothermal liquefaction of Nannochloropsis sp.

Abstract

Keywords

ASJC Scopus subject areas

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