University of Oulu

Lempiäinen, H., Lappalainen, K., Mikola, M., Tuuttila, T., Hu, T., & Lassi, U. (2022). Acid-catalyzed mechanocatalytic pretreatment to improve sugar release from birch sawdust: Structural and chemical aspects. Catalysis Today, 397–399, 550–561.

Acid-catalyzed mechanocatalytic pretreatment to improve sugar release from birch sawdust : structural and chemical aspects

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Author: Lempiäinen, Henna1; Lappalainen, Katja1,2; Mikola, Marja3;
Organizations: 1University of Jyvaskyla, Kokkola University Consortium Chydenius, P.O. Box 567, FI-67100 Kokkola, Finland
2University of Oulu, Research Unit of Sustainable Chemistry, P.O. Box 8000, FI-90014 Oulu, Finland
3University of Oulu, Chemical Process Engineering Research Unit, P.O. Box 8000, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.7 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2021-09-01


This study examined acid-catalyzed mechanocatalytic pretreatment of birch sawdust without a separate impregnation step. Catalyst amount and pretreatment time were the key variables. Pretreated material was mixed with water for hydrolysis (100 °C, 60 min). The efficient release of total reducing sugars from birch sawdust is significant to the path towards biofuels and biochemicals. Based on the results, the structure and surface of birch sawdust changed as a function of mechanocatalytic pretreatment. Milling time caused significant transformations in birch structure and also increased the yields of reducing sugars. The highest yield of total reducing sugar from pretreated sawdust was 23.0% after 30 min of hydrolysis with 1.0 mmol/g acid catalyst, whereas the highest glucose yield was 23.8 g/kg (1.5 mmol/g catalyst, 60 min) and the highest xylose yield was 37.5 g/kg (1.0 mmol/catalyst, 30 min). Overall, acid-catalyzed mechanocatalytic treatment seems to improve sugar yields from birch.

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Series: Catalysis today
ISSN: 0920-5861
ISSN-E: 1873-4308
ISSN-L: 0920-5861
Volume: 397
Pages: 550 - 561
DOI: 10.1016/j.cattod.2021.06.015
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: This work was supported by the Biomass Value Chains project (A71029, the EU/European Regional Development Fund, Leverage from the EU program), the Forest Refine project (Interreg Botnia-Atlantica), the Bioraff Botnia project (20200327, Interreg Botnia-Atlantica), and the Support Association of the Chydenius Institute.
Copyright information: © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (