Effect of Moisture on Polymer Deconstruction in HCl Gas Hydrolysis of Wood

Tainise Lourençon; Michael Altgen; Timo Pääkkönen; Valentina Guccini; Paavo Penttilä; Eero Kontturi; Lauri Rautkari

doi:10.1021/acsomega.1c06773

Effect of Moisture on Polymer Deconstruction in HCl Gas Hydrolysis of Wood

Tainise Lourençon, Michael Altgen^*, Timo Pääkkönen, Valentina Guccini, Paavo Penttilä^*, Eero Kontturi, Lauri Rautkari^*

^*Corresponding author for this work

University of Hamburg

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

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Abstract

The HCl gas system previously used to produce cellulose nanocrystals was applied on Scots pine wood, aiming at a controlled deconstruction of its macrostructure while understanding the effect on its microstructure. The HCl gas treatments resulted in a well-preserved cellular structure of the wood. Differences in wood initial moisture content (iMC) prior to HCl gas treatment played a key role in hydrolysis rather than the studied range of exposure time to the acidic gas. Higher iMCs were correlated with a higher degradation of hemicellulose, while crystalline cellulose microfibrils were not largely affected by the treatments. Remarkably, the hydrogen-deuterium exchange technique showed an increase in accessible OH group concentration at higher iMCs, despite the additional loss in hemicelluloses. Unrelated to changes in the accessible OH group concentration, the HCl gas treatment reduced the concentration of absorbed D₂O molecules.

Original language	English
Pages (from-to)	7074–7083
Journal	ACS Omega
Volume	7
Issue number	8
Early online date	16 Feb 2022
DOIs	https://doi.org/10.1021/acsomega.1c06773
Publication status	Published - 1 Mar 2022
MoE publication type	A1 Journal article-refereed

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10.1021/acsomega.1c06773Licence: CC BY

CHEM_Lourencon_et_al_Effect_of_Moisture_2022_ACS_OmegaFinal published version, 5.16 MBLicence: CC BY

Cite this

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title = "Effect of Moisture on Polymer Deconstruction in HCl Gas Hydrolysis of Wood",

abstract = "The HCl gas system previously used to produce cellulose nanocrystals was applied on Scots pine wood, aiming at a controlled deconstruction of its macrostructure while understanding the effect on its microstructure. The HCl gas treatments resulted in a well-preserved cellular structure of the wood. Differences in wood initial moisture content (iMC) prior to HCl gas treatment played a key role in hydrolysis rather than the studied range of exposure time to the acidic gas. Higher iMCs were correlated with a higher degradation of hemicellulose, while crystalline cellulose microfibrils were not largely affected by the treatments. Remarkably, the hydrogen-deuterium exchange technique showed an increase in accessible OH group concentration at higher iMCs, despite the additional loss in hemicelluloses. Unrelated to changes in the accessible OH group concentration, the HCl gas treatment reduced the concentration of absorbed D2O molecules. ",

author = "Tainise Louren{\c c}on and Michael Altgen and Timo P{\"a}{\"a}kk{\"o}nen and Valentina Guccini and Paavo Penttil{\"a} and Eero Kontturi and Lauri Rautkari",

note = "Funding Information: The authors thank Dr. Chic-Wei Lin for additional experimental work, Hanna Sepp{\"a}l{\"a}inen for the chemical composition analysis, and Dr. Leena Pitk{\"a}nen for her help with the GPC analysis. The authors also acknowledge the OtaNano─Nanomicroscopy Center (Aalto-NMC) for the provision of facilities and technical support offered for the WAXS and SEM measurements. This work made use of Aalto University Bioeconomy Facilities. P.P. acknowledges financial support by the Academy of Finland (grant no. 315768). T.P. acknowledges the funding from Business Finland (R2B project: Gas-driven technology for cost-efficient production of cellulose nanocrystals 42472/31/2020). Publisher Copyright: {\textcopyright} ",

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AU - Lourençon, Tainise

AU - Altgen, Michael

AU - Pääkkönen, Timo

AU - Guccini, Valentina

AU - Penttilä, Paavo

AU - Kontturi, Eero

AU - Rautkari, Lauri

N1 - Funding Information: The authors thank Dr. Chic-Wei Lin for additional experimental work, Hanna Seppäläinen for the chemical composition analysis, and Dr. Leena Pitkänen for her help with the GPC analysis. The authors also acknowledge the OtaNano─Nanomicroscopy Center (Aalto-NMC) for the provision of facilities and technical support offered for the WAXS and SEM measurements. This work made use of Aalto University Bioeconomy Facilities. P.P. acknowledges financial support by the Academy of Finland (grant no. 315768). T.P. acknowledges the funding from Business Finland (R2B project: Gas-driven technology for cost-efficient production of cellulose nanocrystals 42472/31/2020). Publisher Copyright: ©

PY - 2022/3/1

Y1 - 2022/3/1

N2 - The HCl gas system previously used to produce cellulose nanocrystals was applied on Scots pine wood, aiming at a controlled deconstruction of its macrostructure while understanding the effect on its microstructure. The HCl gas treatments resulted in a well-preserved cellular structure of the wood. Differences in wood initial moisture content (iMC) prior to HCl gas treatment played a key role in hydrolysis rather than the studied range of exposure time to the acidic gas. Higher iMCs were correlated with a higher degradation of hemicellulose, while crystalline cellulose microfibrils were not largely affected by the treatments. Remarkably, the hydrogen-deuterium exchange technique showed an increase in accessible OH group concentration at higher iMCs, despite the additional loss in hemicelluloses. Unrelated to changes in the accessible OH group concentration, the HCl gas treatment reduced the concentration of absorbed D2O molecules.

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Effect of Moisture on Polymer Deconstruction in HCl Gas Hydrolysis of Wood

Abstract

UN SDGs

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Other files and links

Fingerprint

HydroCel: Gas-driven technology for cost-efficient production of cellulose nanocrystals

Understanding the moisture behaviour of wood in nanoscale

Bioeconomy Research Infrastructure

OtaNano

OtaNano - Nanomicroscopy Center

Cite this

Effect of Moisture on Polymer Deconstruction in HCl Gas Hydrolysis of Wood

Abstract

UN SDGs

Access to Document

Other files and links

Fingerprint

Projects

HydroCel: Gas-driven technology for cost-efficient production of cellulose nanocrystals

Understanding the moisture behaviour of wood in nanoscale

Equipment

Bioeconomy Research Infrastructure

OtaNano

OtaNano - Nanomicroscopy Center

Cite this