Imperial College London
Alternate

Prof Klaus Hellgardt

Faculty of Engineering, Department of Chemical Engineering

Professor of Chemical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 5577k.hellgardt

 
 
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Location

 

417AACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Cardoso:2018:10.1039/c8gc02210k,
author = {Cardoso, A and Ramirez, Reina T and Suelves, I and Pinilla, JL and Millan, M and Hellgardt, K},
doi = {10.1039/c8gc02210k},
journal = {Green Chemistry},
pages = {4308--4318},
title = {Effect of carbon-based materials and CeO<inf>2</inf>on Ni catalysts for Kraft lignin liquefaction in supercritical water},
url = {http://dx.doi.org/10.1039/c8gc02210k},
volume = {20},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - © The Royal Society of Chemistry 2018. Kraft lignin (KL) is a by-product from cellulose production typically treated as a waste or used as a low-value fuel in heat and power generation in the pulp and paper industry. This study explores KL upgrading to monoaromatic compounds using supercritical water (SCW) as reaction medium. The effect of Ni-CeO2catalysts supported on carbon nanofibers (CNF) and activated carbon (AC) on the product distribution was investigated. These catalysts were prepared by a wet-impregnation method with acetone, and reduced Ni was observed without the use of H2. CNF presented a high degree of stability in SCW. Ni in its reduced state was still present in all spent catalysts, mainly when CNF were the support. While catalysts supported in AC led to high yields of char and gas, a 56 wt% yield of a light liquid fraction, recovered as dichloromethane (DCM)-soluble product and consisting mainly of (methoxy)phenols (>80 mol%), was obtained in a batch reactor at 400 °C, 230 bar, with Ni-CeO2/CNF as a catalyst. A short reaction time was key to avoid the formation of gas and char. This study demonstrates that high yields of DCM-soluble products from KL and low char formation can be obtained by using only SCW and catalysts, an alternative to widely reported approaches like the addition of organic co-solvents (e.g., phenol) and/or H2.
AU  - Cardoso,A
AU  - Ramirez,Reina T
AU  - Suelves,I
AU  - Pinilla,JL
AU  - Millan,M
AU  - Hellgardt,K
DO  - 10.1039/c8gc02210k
EP  - 4318
PY  - 2018///
SN  - 1463-9262
SP  - 4308
TI  - Effect of carbon-based materials and CeO<inf>2</inf>on Ni catalysts for Kraft lignin liquefaction in supercritical water
T2  - Green Chemistry
UR  - http://dx.doi.org/10.1039/c8gc02210k
VL  - 20
ER  -
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