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- W2891070828 abstract "Fast pyrolysis is a promising technology for the production of renewable fuels and chemicals from lignocellulosic biomass. The product distribution (bio-oil, char) and the composition of bio-oil are significantly influenced by the presence of naturally occurring alkali and alkaline-earth metals (AAEMs). In this paper, we investigate, at the molecular level, the influence of Na(I), K(I), Ca(II), and Mg(II) ions on glycosidic bond breaking reactions using density functional theory. Glycosidic bond breaking reactions are categorized as direct C-O breaking mechanisms, namely, transglycosylation, glycosylation, and ring contraction and the two-step pathways, which include the mannose pathway, dehydration, and ring opening. Our calculations show that in the absence of metal, transglycosylation and dehydration pathways (activation barriers ∼55 kcal.mol-1) are kinetically most facile. The linkage type (α- or β-1,4) has an insignificant effect on kinetics of glycosidic bond cleavage. Mg(II) ions have a pronounced effect on lowering the activation barriers of glycosylation, ring contraction, and the mannose pathway, requiring activation enthalpies of 32-52 kcal.mol-1. Conversely, Mg(II) and Ca(II) ions inhibit the dehydration pathway. Na(I) and K(I) ions do not significantly influence the activation barriers of glycosidic bond cleavage reactions, as the reduction is only about 5-10 kcal.mol-1. Thus, AAEM ions exhibit different catalytic effects on glycosidic bond breaking reactions." @default.
- W2891070828 created "2018-09-27" @default.
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- W2891070828 date "2018-09-04" @default.
- W2891070828 modified "2023-10-03" @default.
- W2891070828 title "Influence of Alkali and Alkaline-Earth Metals on the Cleavage of Glycosidic Bond in Biomass Pyrolysis: A DFT Study Using Cellobiose as a Model Compound" @default.
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- W2891070828 doi "https://doi.org/10.1021/acs.jpca.8b06083" @default.
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