The impact of salts formed by the neutralisation of (ligno)cellulose hydrolysates on the hydrogenation of sugars
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Dilute acid hydrolysis of lignocellulose often requires a neutralisation step to utilise the hydrolysate's sugars. In this context, very little is known regarding the impact of low levels of acids or their corresponding salts produced by neutralisation on the catalyst performance in the hydrogenation of sugars. In this work, the influence of a series of ammonium and alkali metal salts (that is, NH4NO3, NaNO3, (NH4)2SO4, Na2SO4 and K2SO4) on the hydrogenation of glucose and xylose is addressed. This study also encompasses “real‐world” hydrolysates obtained by the mechanocatalytic depolymerisation of α‐cellulose and beechwood. The impact of low levels of acids and their salts upon the hydrogenation of sugars to sugar alcohols (alditols) was examined, in the presence of a commercial Ru/C catalyst (Ru/C, 0.7 wt % Ru) at 110 °C using batch and trickle‐bed reactors. The results show that the presence of salts leads to a considerable decrease in the alditols yields. Notably, salt anions exert an effect stronger than that of cations in the catalyst deactivation. Surprisingly, nitrates had a more significant effect on the decrease in the alditols yield than sulfates, and chlorides had the lowest impact. In this study, we also present the effect of sugars’ degradation products (e.g. 5‐(hydroxymethyl)furfural and furfural) upon hydrogenation of lignocellulose hydrolysates. The activated carbon pre‐treatments of the hydrolysates showed a positive effect on the catalyst activity, adsorbing hydrolysis by‐products. Overall, this study has significant implications for the practical aspects of hydrogenation of lignocellulose hydrolysates, which are often neglected in the current literature.
Date Issued
2018-06-07
Date Acceptance
2018-02-13
Citation
ChemCatChem, 2018, 10 (11), pp.2409-2416
ISSN
1867-3880
Publisher
Wiley
Start Page
2409
End Page
2416
Journal / Book Title
ChemCatChem
Volume
10
Issue
11
Copyright Statement
© 2018 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article, which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1002/cctc.201702051. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000437267500012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Chemistry, Physical
Chemistry
alcohols
anions
biomass
hydrogenation
hydrolysis
WATER-SOLUBLE LIGNOCELLULOSE
RANEY-TYPE NI
D-GLUCOSE
MECHANOCATALYTIC DEPOLYMERIZATION
SELECTIVE HYDROGENATION
ACID-HYDROLYSIS
HYDRATE MEDIA
IONIC LIQUIDS
CELLULOSE
CATALYSTS
Publication Status
Published
Date Publish Online
2018-02-13