Journal ArticleDOI
Hydrolysis of Cellulose by Amorphous Carbon Bearing SO3H, COOH, and OH Groups
Satoshi Suganuma,Kiyotaka Nakajima,Masaaki Kitano,Daizo Yamaguchi,Hideki Kato,Shigenobu Hayashi,Michikazu Hara +6 more
TLDR
The carbon catalyst can be readily separated from the saccharide solution after reaction for reuse in the reaction without loss of activity, and the catalytic performance of the carbon catalyst is attributed to the ability of the material to adsorb beta-1,4 glucan, which does not adsorb to other solid acids.Abstract:
The hydrolysis of cellulose into saccharides using a range of solid catalysts is investigated for potential application in the environmentally benign saccharification of cellulose. Crystalline pure cellulose is not hydrolyzed by conventional strong solid Bronsted acid catalysts such as niobic acid, H-mordenite, Nafion and Amberlyst-15, whereas amorphous carbon bearing SO 3H, COOH, and OH function as an efficient catalyst for the reaction. The apparent activation energy for the hydrolysis of cellulose into glucose using the carbon catalyst is estimated to be 110 kJ mol (-1), smaller than that for sulfuric acid under optimal conditions (170 kJ mol (-1)). The carbon catalyst can be readily separated from the saccharide solution after reaction for reuse in the reaction without loss of activity. The catalytic performance of the carbon catalyst is attributed to the ability of the material to adsorb beta-1,4 glucan, which does not adsorb to other solid acids.read more
Citations
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Journal ArticleDOI
Hemicelluloses for fuel ethanol: A review.
Francisco M. Gírio,César Fonseca,Florbela Carvalheiro,Luís C. Duarte,Susana Marques,Rafał Bogel-Łukasik +5 more
TL;DR: The various hemicelluloses structures present in lignocellulose, the range of pre-treatment and hydrolysis options including the enzymatic ones, and the role of different microbial strains on process integration aiming to reach a meaningful consolidated bioprocessing are reviewed.
Journal ArticleDOI
Catalytic conversion of lignocellulosic biomass to fine chemicals and fuels
TL;DR: This critical review provides insights into the state-of-the-art accomplishments in the chemocatalytic technologies to generate fuels and value-added chemicals from lignocellulosic biomass, with an emphasis on its major component, cellulose.
Journal ArticleDOI
Lignin depolymerization (LDP) in alcohol over nickel-based catalysts via a fragmentation–hydrogenolysis process
Qi Song,Qi Song,Feng Wang,Jiaying Cai,Jiaying Cai,Yehong Wang,Junjie Zhang,Junjie Zhang,Weiqiang Yu,Jie Xu +9 more
TL;DR: In this article, the authors showed that lignin can be selectively cleaved into propylguaiacol and propylsyringol with total selectivity >90% at a lignins conversion of about 50%.
Journal ArticleDOI
Hydrogenolysis Goes Bio: From Carbohydrates and Sugar Alcohols to Platform Chemicals
TL;DR: Past and present developments in hydrogenolysis reactions are highlighted, with special emphasis on the direct utilization of cellulosic feedstocks, to bridge currently available technologies and future biomass-based refinery concepts.
References
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Journal ArticleDOI
A Carbon Material as a Strong Protonic Acid
Michikazu Hara,Takemi Yoshida,Atsushi Takagaki,Tsuyoshi Takata,Junko N. Kondo,Shigenobu Hayashi,Kazunari Domen +6 more
Journal ArticleDOI
Acid-Catalyzed Reactions on Flexible Polycyclic Aromatic Carbon in Amorphous Carbon
Mai Okamura,Atsushi Takagaki,Masakazu Toda,Junko N. Kondo,Kazunari Domen,Takashi Tatsumi,Michikazu Hara,Shigenobu Hayashi +7 more
TL;DR: In this paper, a functionalized amorphous carbon material with acid catalytic activity as a solid acid replacement for sulfuric acid was used for liquid-phase acid-catalyzed reactions.
Journal ArticleDOI
Kinetic study on the acid-catalyzed hydrolysis of cellulose to levulinic acid
TL;DR: In this paper, a detailed kinetic study on the acid-catalyzed hydrolysis of cellulose to levulinic acid was performed in a temperature window of 150−200 °C, sulfuric acid concentrations between 0.05 and 1 M, and initial cellulose intakes between 1.7 and 14 wt %.
Journal ArticleDOI
Acetic acid—friend or foe in anaerobic batch conversion of glucose to ethanol by Saccharomyces cerevisiae?
TL;DR: The results showed that the concentration of the undissociated form of acetic acid should not exceed 5 gl−1 in the medium for growth to occur, which led to an increased ethanol yield on glucose and the biomass and glycerol yields decreased by 45 and 33%, respectively.
Journal ArticleDOI
Perfluorinated Resinsulfonic Acid (Nafion-H®) Catalysis in Synthesis
TL;DR: In this article, the authors discuss applications catalytiques du Nafion H and de ses derives modifies en synthese organique. And they present a survey of applications of catalytique.