Analysis of the physical and chemical mechanisms of potassium catalysis in the decomposition reactions of wood / C. Di Balsi in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3864-3873 Titre : Analysis of the physical and chemical mechanisms of potassium catalysis in the decomposition reactions of wood Type de document : texte imprimé Auteurs : C. Di Balsi, Auteur ; A. Galgano, Auteur ; C. Branca, Auteur Année de publication : 2011 Article en page(s) : pp. 3864-3873 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Wood Catalysis Résumé : Fir wood pyrolysis is carried out for extracted, KOH and KCl impregnated, and impregnated-extracted samples. For K― concentrations in wood of 0.14% (dry mass basis), the effects of KOH are quantitatively higher, but both additives produce a significant diminution in the yields of hydroxyacetaldehyde, furfural, and sugars, the decomposition temperature, and the conversion time. Water extraction ofKCl impregnated samples is apt to reproduce again the characteristics of extracted wood pyrolysis. Instead, water extraction ofKOH impregnated samples only reports the yields ofhydroxyacetaldehyde, acetic acid, and hydroxypropanone to the original values whereas differences in the other variables, especially characteristic times and temperatures and levoglucosan yields, remain very large. Therefore, the action of the impregnated K+ compounds during wood pyrolysis can be attributed to both irreversible modifications in the wood structure during impregnation, whose entity depends on the basicity of the aqueous solution, and intrinsic action of the K― ion on the activity of the decomposition reactions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027630 [article] Analysis of the physical and chemical mechanisms of potassium catalysis in the decomposition reactions of wood [texte imprimé] / C. Di Balsi, Auteur ; A. Galgano, Auteur ; C. Branca, Auteur . - 2011 . - pp. 3864-3873. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3864-3873 Mots-clés : Wood Catalysis Résumé : Fir wood pyrolysis is carried out for extracted, KOH and KCl impregnated, and impregnated-extracted samples. For K― concentrations in wood of 0.14% (dry mass basis), the effects of KOH are quantitatively higher, but both additives produce a significant diminution in the yields of hydroxyacetaldehyde, furfural, and sugars, the decomposition temperature, and the conversion time. Water extraction ofKCl impregnated samples is apt to reproduce again the characteristics of extracted wood pyrolysis. Instead, water extraction ofKOH impregnated samples only reports the yields ofhydroxyacetaldehyde, acetic acid, and hydroxypropanone to the original values whereas differences in the other variables, especially characteristic times and temperatures and levoglucosan yields, remain very large. Therefore, the action of the impregnated K+ compounds during wood pyrolysis can be attributed to both irreversible modifications in the wood structure during impregnation, whose entity depends on the basicity of the aqueous solution, and intrinsic action of the K― ion on the activity of the decomposition reactions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027630

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