持続可能な製造のための木材廃棄物の変換(Transforming wood waste for sustainable manufacturing)

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2024-03-20 ワシントン大学セントルイス校

ワシントン大学のマーカス・フォストン教授は、木材の主要成分であるリグニンを小分子に分解し、それを再生可能な化学物質に変換する方法を探っています。彼の研究は、リグニンを解体する際の触媒と溶媒の相互作用をニュートロン散乱で調査し、リグニンの効率的な利用に向けた手法を開発しています。これにより、リグニンから再生可能な化学物質を生産し、石油由来の化学物質に代替することが可能になります。

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小角中性子散乱を用いた触媒分解過程におけるリグニンの構造変化の研究 Structural Evolution of Lignin Using In Situ Small-Angle Neutron Scattering during Catalytic Disassembly

Jialiang Zhang, Zhi Yang, Aditya Ponukumati, Manjula Senanayake, Sai Venkatesh Pingali, and Marcus Foston
ACS Sustainable Chemistry & Engineering  Published:January 17, 2024
DOI:https://doi.org/10.1021/acssuschemeng.3c06368

Abstract

持続可能な製造のための木材廃棄物の変換(Transforming wood waste for sustainable manufacturing)

A fundamental understanding of the solution behavior of lignin under reaction conditions is required for the rational design of porous heterogeneous catalysts that minimize the mass-transfer limitations on lignin depolymerization kinetics. In situ and ex situ small-angle neutron scattering (SANS) methods were used to study the structural changes of lignin during non-catalytic solvolysis reactions in deuterated methanol (MeOH-d4) and catalytic reactions in the presence of copper-containing porous metal oxide (CuPMO) and MeOH-d4. The results indicate that at room temperature, lignin adopted a rigid and stretched conformation that becomes more spherical, flexible, and folded when heated to the reaction temperature of 250 °C. In the presence of CuPMO, the volume fraction of small lignin particles (<50 Å) in the reactor is higher than under solvolysis conditions, while the median radius of this fraction of lignin particles is smaller. The SANS data were analyzed using a population balance model and found that two reaction processes dominate: disassembly of large lignin aggregate particles (>50 Å) and condensation of small lignin particles (<50 Å). The study also suggests that the cooling and quenching step in the ex situ experiments alters the small lignin (<50 Å) particle size distribution.

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