A1 Journal article (refereed)
The Effect of Mechanocatalytic Pretreatment on the Structure and Depolymerization of Willow (2020)

Lempiäinen, H., Lappalainen, K., Haverinen, J., Tuuttila, T., Hu, T., Jaakkola, M., & Lassi, U. (2020). The Effect of Mechanocatalytic Pretreatment on the Structure and Depolymerization of Willow. Catalysts, 10(2), Article 255. https://doi.org/10.3390/catal10020255

JYU authors or editors

Publication details

All authors or editors: Lempiäinen, Henna; Lappalainen, Katja; Haverinen, Jasmiina; Tuuttila, Tero; Hu, Tao; Jaakkola, Mari; Lassi, Ulla

Journal or series: Catalysts

eISSN: 2073-4344

Publication year: 2020

Volume: 10

Issue number: 2

Article number: 255

Publisher: MDPI

Publication country: Switzerland

Publication language: English

DOI: https://doi.org/10.3390/catal10020255

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/67986

Additional information: This article belongs to the Special Issue Direct Catalytic Conversion of Raw or Waste Biomass to Biofuels and Chemical Building Blocks.


In this study, the effect of a mechanocatalytic pretreatment on the structure of willow and sugar release from pretreated willow was explored. In the mechanocatalytic approach, the pretreatment consists of solvent-free impregnation with sulfuric acid and a mechanical treatment with ball milling. Willow sawdust and pretreated samples were analyzed with field emission scanning electron microscope and X-ray diffraction. The products in the sugar solution were determined as the total reducing sugars with the 3,5-dinitrosalicylic acid method and monosaccharides with capillary electrophoresis. According to the results, milling increased the sugar production, depending on the sulfuric acid load. The milling parameters, such as the rotation speed of the mill, the catalyst-to-willow ratio, and the milling time influenced the amount of sugars in the hydrolysate and the composition of the sugar solution produced. Changes were observed in the surface of the willow particles as well as changes in the crystalline structure. Glucose and xylose yields increased after 15 min of milling and reached their maximum level after 45 min of milling with the 0.5 mmol/g sulfuric acid load.

Keywords: cellulose; preliminary treatment; sulphuric acid; willows; polymerisation

Free keywords: willow sawdust; lignocellulose; sulfuric acid; mechanocatalytic pretreatment; ball milling

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Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 1

Last updated on 2022-20-09 at 13:37