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Conversion of biomass into hydrogen by supercritical water gasification: a review

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Abstract

The rising issues of global warming due to the rapid use of fossil fuels are calling for sustainable energies such as dihydrogen, thereafter named ‘hydrogen’. The hydrogen demand has quadrupled in the past 45 years from 18 million tons in 1975 to 90 million tons in 2020 with a projected increase to 180 million tons by 2030. Here, we review the conversion of biomass into hydrogen by supercritical water gasification into hydrogen-rich syngas, with focus on thermophysical properties of supercritical water, parameters influencing water gasification and supercritical water gasification of cellulose, hemicellulose, lignin, biomass and model compounds. Parameters influencing water gasification include temperature, pressure, feedstock concentration and reaction time. Processes influencing products distribution comprise hydrolysis, water–gas shift, methanation, hydrogenation and reforming.

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Abbreviations

%:

Percent

°C:

Degree Celsius

Al2O3 :

Alumina

C2H6 :

Ethane

CH4 :

Methane

CO:

Carbon monoxide

CO2 :

Carbon dioxide

Cu:

Copper

h:

Hour

H2 :

Hydrogen

K2CO3 :

Potassium carbonate

kg/m3 :

Kilogram per cubic meter

kJ/mol:

Kilojoules per mole

KOH:

Potassium hydroxide

m2/s:

Meter square per second

min:

Minutes

MJ/kg:

Megajoules per kilogram

mmol/g:

Millimoles per gram

mol/L:

Moles per liter

MPa:

Megapascal

mPa·s:

Millipascal-second

NaOH:

Sodium hydroxide

Ni:

Nickel

O2 :

Oxygen

pH:

Potential of hydrogen

Ru:

Ruthenium

s:

Seconds

wt%:

Weight percent

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Funding

The authors acknowledge the funding received from the Natural Sciences and Engineering Research Council of Canada (NSERC); and the Canada Research Chairs (CRC) Program; BioFuelNet Canada and Agriculture and Agri-Food Canada (AAFC).

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Authors

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Correspondence to Ajay K. Dalai.

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None declared.

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Khandelwal, K., Nanda, S., Boahene, P. et al. Conversion of biomass into hydrogen by supercritical water gasification: a review. Environ Chem Lett 21, 2619–2638 (2023). https://doi.org/10.1007/s10311-023-01624-z

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  • DOI: https://doi.org/10.1007/s10311-023-01624-z

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