Idrolisi diretta di cellulosa e lignocellulosa in catalisi eterogenea

Mancini, Alessia (2013) Idrolisi diretta di cellulosa e lignocellulosa in catalisi eterogenea. [Laurea magistrale], Università di Bologna, Corso di Studio in Chimica industriale [LM-DM270]
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This work deals with a comparison of the catalytic behavior of several heterogeneous acid catalysts in the direct hydrolysis of an untreated softwood dust. Amongst the various catalysts investigated, some were characterized by relatively high yield to monosaccharides, such as a Zirconium phosphate and the reference Amberlyst 15. Conversely, some catalyst types, ie, Sn/W mixed oxide and Zirconia-grafted trifluoromethanesulphonic acid, were selective into glucose, since sugars derived from hemicellulose dissolution and hydrolysis were rapidly degraded. A detailed analysis of the reactivity of Zr/P/O was pursued, in the hydrolysis of both untreated and ball-milled microcrystalline cellulose; at 150°C and 3h reaction time, the catalyst gave high selectivity to glucose, with negligible formation of 5-hydroxymethylfurfural, and moderate cellulose conversion. After ball-milling of the cellulose, a remarkable increase of conversion was achieved, still with a high selectivity to glucose and very low formation of degradation compounds. The catalyst showed high affinity for β-1,4-glucans, as demonstrated by the activity in cellobiose hydrolysis into glucose.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Mancini, Alessia
Relatore della tesi
Correlatore della tesi
Corso di studio
Ordinamento Cds
Parole chiave
idrolisi, cellulosa, lignocellulosa, catalisi eterogenea, Zirconio fosfato
Data di discussione della Tesi
26 Luglio 2013

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