O2 as initiator of autocatalytic degradation of hemicelluloses and monosaccharides in hydrothermal treatment of spruce

Jussi V. Rissanen, Lucas Lagerquist, Kari Eränen, Jarl Hemming, Patrik Eklund, Henrik Grènman*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArtikkeliTieteellinenvertaisarvioitu

4 Sitaatiot (Scopus)
157 Lataukset (Pure)

Abstrakti

The influence of oxygen (0–50 bar) on the molar mass and composition of hemicelluloses after hydrothermal treatment of spruce chips was studied in a batch reactor setup at 130 °C–160 °C. Purified galactoglucomannan was studied as a reference. The dissolved oxygen enhanced significantly the depolymerization of hemicelluloses from over 15,000 g/mol to 180 g/mol (monomers) as well as promoted acids formation from the monosaccharides. About 2–3 times faster depolymerization was observed already with rather low amounts of oxygen (2–8 bar), while the kinetics of depolymerization was significantly slower in inert atmosphere. The decrease in pH from neutral to as low as 2.5 lead to an autocatalytic effect on the polysaccharide hydrolysis and the consecutive reactions of monosaccharides. The results emphasize the importance of performing hydrothermal treatment under inert atmosphere if large polymeric hemicellulsoses are desired or if monosaccharides are targeted in hydrolysis of hemicelluloses. If autocatalysis begins, it is difficult to stop.

AlkuperäiskieliEnglanti
Artikkeli119740
JulkaisuCarbohydrate Polymers
Vuosikerta293
DOI - pysyväislinkit
TilaJulkaistu - 1 lokak. 2022
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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