Conversion of cellulose to 2,5-hexanedione using tungstated zirconia in hydrogen atmosphere

Abstract 2,5 Hexanedione is produced from cellulose using ZrW in the presence of hydrogen while lactic acid is the main product in helium atmosphere. FTIR and kinetics studies strengthened the proposed mechanism which involves important elementary steps, namely hydroxyls abstractions and hydride transfers promoted by the Lewis acid sites of ZrW. Moreover the important increase in cellulose conversion in the presence of ZrW in hydrogen atmosphere was explained by the likely formation of additional Bronsted acid sites formed by hydrogen interacting with ZrW which catalyze the protolysis of the glycosidic bonds in cooperation with the pool of hydroxonium ions provided by the self-protolysis of water at 190 °C.

[1]  Bert F. Sels,et al.  Zeolite-catalysed conversion of C3 sugars to alkyl lactates , 2010 .

[2]  Michikazu Hara,et al.  Hydrolysis of cellulose by amorphous carbon bearing SO3H, COOH, and OH groups. , 2008, Journal of the American Chemical Society.

[3]  Haichao Liu,et al.  Cellulose conversion into polyols catalyzed by reversibly formed acids and supported ruthenium clusters in hot water. , 2007, Angewandte Chemie.

[4]  S. Saravanamurugan,et al.  Conversion of Sugars to Lactic Acid Derivatives Using Heterogeneous Zeotype Catalysts , 2010, Science.

[5]  B. Gates,et al.  Reaction pathways in n-pentane conversion catalyzed by tungstated zirconia: effects of platinum in the catalyst and hydrogen in the feed , 2003 .

[6]  C. Pinel,et al.  Non-catalyzed and Pt/γ-Al2O3-catalyzed hydrothermal cellulose dissolution–conversion: influence of the reaction parameters and analysis of the unreacted cellulose , 2009 .

[7]  Catherine Pinel,et al.  Cellulose hydrothermal conversion promoted by heterogeneous Bronsted and Lewis acids: Remarkable efficiency of solid Lewis acids to produce lactic acid , 2011 .

[8]  Tao Zhang,et al.  Direct catalytic conversion of cellulose into ethylene glycol using nickel-promoted tungsten carbide catalysts. , 2008, Angewandte Chemie.

[9]  Max Shtein,et al.  Structure and Electronic Properties of Solid Acids Based on Tungsten Oxide Nanostructures , 1999 .

[10]  Catherine Pinel,et al.  Cellulose reactivity and glycosidic bond cleavage in aqueous phase by catalytic and non catalytic transformations , 2011 .

[11]  A. Onda,et al.  Selective hydrolysis of cellulose into glucose over solid acid catalysts , 2008 .