Catalytic upgrading of hydrothermal liquefaction biocrudes: Different challenges for different feedstocks

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)

Abstract

Hydrothermal liquefaction (HTL) followed by catalytic hydrotreating of the produced biocrude is increasingly gaining ground as an effective technology for the conversion of biomass into liquid biofuels. A strong advantage of HTL resides in its great flexibility towards the feedstock, since it is able to treat a large number of different organic substrates, ranging from dry to wet residual biomass. Nevertheless, the characteristics of biocrudes from different typologies of organic materials result in different challenges to be met during the hydrotreating step, leading to differences in heteroatoms removal and in the typology and composition of the targeted products. In this work, biocrudes were catalytically hydrotreated with a commercial NiMo/Al2O3 catalyst at different temperatures and pressures. Sewage sludge biocrude was found to be very promising for the production of straight-chain hydrocarbons in the diesel range, with considerable heteroatoms removal even at mild hydrotreating conditions. Similar results were shown by algal biocrude, although complete denitrogenation is challenging. Upgraded biocrudes from lignocellulosic feedstock (miscanthus) showed high yields in the gasoline range, with a remarkable content of aromatics. Operating at a higher H2 pressure was found to be crucial to prevent coking and decarboxylation reactions.
Original languageEnglish
JournalRenewable Energy
Volume141
Pages (from-to)420-430
Number of pages11
ISSN0960-1481
DOIs
Publication statusPublished - Oct 2019

Fingerprint

Liquefaction
Feedstocks
Biomass
Coking
Sewage sludge
Biofuels
Gasoline
Hydrocarbons
Catalysts
Liquids
Substrates
Chemical analysis
Temperature
Decarboxylation

Keywords

  • Catalytic hydrotreating
  • Drop-in fuels
  • Hydrothermal liquefaction
  • Nitrogen-containing compounds

Cite this

@article{71098f3b1ab4419f8ce1d26b71f8ffc4,
title = "Catalytic upgrading of hydrothermal liquefaction biocrudes: Different challenges for different feedstocks",
abstract = "Hydrothermal liquefaction (HTL) followed by catalytic hydrotreating of the produced biocrude is increasingly gaining ground as an effective technology for the conversion of biomass into liquid biofuels. A strong advantage of HTL resides in its great flexibility towards the feedstock, since it is able to treat a large number of different organic substrates, ranging from dry to wet residual biomass. Nevertheless, the characteristics of biocrudes from different typologies of organic materials result in different challenges to be met during the hydrotreating step, leading to differences in heteroatoms removal and in the typology and composition of the targeted products. In this work, biocrudes were catalytically hydrotreated with a commercial NiMo/Al2O3 catalyst at different temperatures and pressures. Sewage sludge biocrude was found to be very promising for the production of straight-chain hydrocarbons in the diesel range, with considerable heteroatoms removal even at mild hydrotreating conditions. Similar results were shown by algal biocrude, although complete denitrogenation is challenging. Upgraded biocrudes from lignocellulosic feedstock (miscanthus) showed high yields in the gasoline range, with a remarkable content of aromatics. Operating at a higher H2 pressure was found to be crucial to prevent coking and decarboxylation reactions.",
keywords = "Catalytic hydrotreating, Drop-in fuels, Hydrothermal liquefaction, Nitrogen-containing compounds",
author = "Daniele Castello and Haider, {Muhammad Salman} and Rosendahl, {Lasse Aistrup}",
year = "2019",
month = "10",
doi = "10.1016/j.renene.2019.04.003",
language = "English",
volume = "141",
pages = "420--430",
journal = "Renewable Energy",
issn = "0960-1481",
publisher = "Pergamon Press",

}

Catalytic upgrading of hydrothermal liquefaction biocrudes : Different challenges for different feedstocks. / Castello, Daniele; Haider, Muhammad Salman; Rosendahl, Lasse Aistrup.

In: Renewable Energy, Vol. 141, 10.2019, p. 420-430.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Catalytic upgrading of hydrothermal liquefaction biocrudes

T2 - Different challenges for different feedstocks

AU - Castello, Daniele

AU - Haider, Muhammad Salman

AU - Rosendahl, Lasse Aistrup

PY - 2019/10

Y1 - 2019/10

N2 - Hydrothermal liquefaction (HTL) followed by catalytic hydrotreating of the produced biocrude is increasingly gaining ground as an effective technology for the conversion of biomass into liquid biofuels. A strong advantage of HTL resides in its great flexibility towards the feedstock, since it is able to treat a large number of different organic substrates, ranging from dry to wet residual biomass. Nevertheless, the characteristics of biocrudes from different typologies of organic materials result in different challenges to be met during the hydrotreating step, leading to differences in heteroatoms removal and in the typology and composition of the targeted products. In this work, biocrudes were catalytically hydrotreated with a commercial NiMo/Al2O3 catalyst at different temperatures and pressures. Sewage sludge biocrude was found to be very promising for the production of straight-chain hydrocarbons in the diesel range, with considerable heteroatoms removal even at mild hydrotreating conditions. Similar results were shown by algal biocrude, although complete denitrogenation is challenging. Upgraded biocrudes from lignocellulosic feedstock (miscanthus) showed high yields in the gasoline range, with a remarkable content of aromatics. Operating at a higher H2 pressure was found to be crucial to prevent coking and decarboxylation reactions.

AB - Hydrothermal liquefaction (HTL) followed by catalytic hydrotreating of the produced biocrude is increasingly gaining ground as an effective technology for the conversion of biomass into liquid biofuels. A strong advantage of HTL resides in its great flexibility towards the feedstock, since it is able to treat a large number of different organic substrates, ranging from dry to wet residual biomass. Nevertheless, the characteristics of biocrudes from different typologies of organic materials result in different challenges to be met during the hydrotreating step, leading to differences in heteroatoms removal and in the typology and composition of the targeted products. In this work, biocrudes were catalytically hydrotreated with a commercial NiMo/Al2O3 catalyst at different temperatures and pressures. Sewage sludge biocrude was found to be very promising for the production of straight-chain hydrocarbons in the diesel range, with considerable heteroatoms removal even at mild hydrotreating conditions. Similar results were shown by algal biocrude, although complete denitrogenation is challenging. Upgraded biocrudes from lignocellulosic feedstock (miscanthus) showed high yields in the gasoline range, with a remarkable content of aromatics. Operating at a higher H2 pressure was found to be crucial to prevent coking and decarboxylation reactions.

KW - Catalytic hydrotreating

KW - Drop-in fuels

KW - Hydrothermal liquefaction

KW - Nitrogen-containing compounds

UR - http://www.scopus.com/inward/record.url?scp=85064452571&partnerID=8YFLogxK

U2 - 10.1016/j.renene.2019.04.003

DO - 10.1016/j.renene.2019.04.003

M3 - Journal article

VL - 141

SP - 420

EP - 430

JO - Renewable Energy

JF - Renewable Energy

SN - 0960-1481

ER -