Tohoku University · 工学
郭海新教授の研究室では、バイオマスを効率的に利用するための新規触媒開発とプロセス技術の確立を主眼としています。特に、セルロースを原料とするスーパーパラマグネティックな固体酸触媒の開発や、イオン液体を用いたバイオエタノール誘導体（5-EMF）の高効率合成に注力しています。また、リン酸塩の効果的除去を目的としたランタン系酸化物触媒の開発や、デキストリンやヘミセルロースを効率的に分解するためのデリグニフィケーション技術の開発も進めています。
Figures are computed from collected data and may differ slightly.
A cellulose-derived carbonaceous solid acid catalyst that has superparamagnetism was synthesized by incomplete hydrothermal carbonization of cellulose followed by Fe3O4 grafting and –SO3H group functionalization. The as-prepared superparamagnetic carbon catalyst contained –SO3H, –COOH, and phenolic –OH groups and exhibited good catalytic activity for the hydrolysis of cellulose in either an ionic liquid phase or aqueous phase. A total reducing sugar (TRS) yield of 68.9% was obtained with ionic l
Hydrogen sulfate ionic liquid additives with aluminum chloride catalyst in ethanol were found to promote efficient (30 min) one-pot, one-step transformation of glucose into 5-ethoxymethylfurfural (5-EMF) in 37% yields. Spectroscopic measurements (FT-IR, 1H NMR) showed that ionic liquids form multiple hydrogen bonds with glucose and promote its ring opening through ionic liquid–AlCl3 complexes to enable formation of 5-EMF via 5-hydroxymethylfurfural (5-HMF). Reactions performed in dimethyl sulfox
As one of the substitutes for traditional fossil energy, the biomass resource has attracted extensive attention. Levulinate esters (LEs) are important green and high value-added chemical molecules. Catalytic routes based on acid catalysts are developed for the production of levulinate esters from various biomass-derived materials. In this review, the catalytic route for preparation of levulinate esters from C5/C6 carbohydrates is summarized. The effects of homogeneous and heterogeneous acid syst
La-based metal oxide materials are environmentally friendly and show promise for phosphate adsorption. A series of Al-doped perovskite oxides, such as LaFe<sub><i>x</i></sub>Al<sub>1-<i>x</i></sub>O<sub>3</sub>, were prepared using a facile citric acid-assisted sol-gel method. The characterization results demonstrated that with optimized Al doping, there was a significant increase in the specific surface area and increased defect content of perovskite oxide LaFe<sub><i>x</i></sub>Al<sub>1-<i>x</
Renewable resources must be upgraded to platform chemicals and biofuels, especially furanic compounds such as 5-hydroxymethylfurfural (5-HMF) and 5-ethoxymethylfurfural (5-EMF), to meet the needs of a sustainable society. This review examines chemocatalytic approaches to 5-EMF via alcoholysis of 5-(halomethyl)furfural or etherification of 5-HMF with attention being given to direct catalytic conversion of biomass-derived materials into 5-EMF. Emphasis is placed on the reaction mechanisms and path
Plant-based waste biomass with lignocellulose as an important component is produced in large quantities worldwide every year. The components of lignocellulose that typically exhibit high utilization value include cellulose and hemicellulose, as well as pentoses and hexoses derived from their hydrolysis. As a pretreatment for the hydrolysis process, delignification is a pivotal step to enhance cellulose/hemicellulose accessibility and achieve high yields of fermentable sugars. Additionally, deep
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