Production of Methyl Lactate with Sn-USY and Sn-β: Insights into Real Hemicellulose Valorization

Abstract

Potassium exchanged Sn-β and Sn-USY zeolites have been tested for the transformation of various aldoses (hexoses and pentoses), exhibiting outstanding catalytic activity and selectivity toward methyl lactate. Insights into the transformation pathways using reaction intermediates─dihydroxyacetone and glycolaldehyde─as substrates revealed a very high catalytic proficiency of both zeolites in aldol and retro-aldol reactions, showcasing their ability to convert small sugars into large sugars, and vice versa. This feature makes the studied Sn-zeolites outstanding catalysts for the transformation of a wide variety of sugars into a limited range of commercially valuable alkyl lactates and derivatives. [K]Sn-β proved to be superior to [K]Sn-USY in terms of shape selectivity, exerting tight control on the distribution of produced α-hydroxy methyl esters. This shape selectivity was evident in the transformation of several complex sugar mixtures emulating different hemicelluloses─sugar cane bagasse, Scots pine, and white birch─that, despite showing very different sugar compositions, were almost exclusively converted into methyl lactate and methyl vinyl glycolate in very similar proportions. Moreover, the conversion of a real hemicellulose hydrolysate obtained from Scots pine through a simple GVL-based organosolv process confirmed the high activity and selectivity of [K]Sn-β in the studied transformation, opening new pathways for the chemical valorization of this plentiful, but underutilized, sugar feedstock.

Publication DOI: https://doi.org/10.1021/acssuschemeng.3c07356
Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
Aston University (General)
Funding Information: This work received financial support from the Spanish Ministry of Science and Innovation through Cat4BioMon Project (PID2021-122736OB-C44), being funded through MCIN/AEI/10.13039/501100011033/FEDER, UE. This work has received funding from the Biobased Ind
Additional Information: Copyright © 2024 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords: Sn-USY,Sn-β,biomass,hemicellulose,methyl lactate,retroaldol reaction,zeolites,General Chemical Engineering,General Chemistry,Renewable Energy, Sustainability and the Environment,Environmental Chemistry
Publication ISSN: 2168-0485
Last Modified: 08 Nov 2024 08:25
Date Deposited: 15 Feb 2024 18:19
Full Text Link:
Related URLs: https://pubs.ac ... chemeng.3c07356 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2024-02-19
Published Online Date: 2024-02-06
Accepted Date: 2024-01-22
Authors: Jiménez-Martin, Jose M.
El Tawil-Lucas, Miriam
Montaña, Maia
Linares, María
Osatiashtiani, Amin (ORCID Profile 0000-0003-1334-127X)
Vila, Francisco
Alonso, David Martín
Moreno, Jovita
García, Alicia
Iglesias, Jose

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