Synergistic Effect between Defect Sites and Functional Groups on the Hydrolysis of Cellulose over Activated Carbon

ChemSusChem ◽  
2014 ◽  
Vol 8 (3) ◽  
pp. 534-543 ◽  
Author(s):  
Guo Shiou Foo ◽  
Carsten Sievers
Keyword(s):  
Activated Carbon ◽  
Synergistic Effect ◽  
Functional Groups ◽  
Defect Sites ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

scholarly journals Conditions of hydrolysis with a specific pair of endo- and exo-cellulases

2021 ◽  
Author(s):  
Yoshiki Kitano
Keyword(s):  
Synergistic Effect ◽  
Crystalline Cellulose ◽  
Carbohydrate Binding ◽  
Amorphous Cellulose ◽  
Potential Synergy ◽  
Hydrolysis Of Cellulose ◽  
Potential Alternative ◽  
Specific Pair ◽  
Hydrolysis Of ◽  
Increased Activity

Enzymatic hydrolysis of cellulose is a technology involved in the production of bioethanol, a potential alternative renewable energy. Many cellulases with endo- and exo- type of activity are known to hydrolyze cellulose synergistically. In this thesis, potential synergy between an endo-cellulase, Cel5B, with and without a carbohydrate- binding module (CBM6), and a new exo-cellulase, CBH1, from Trichoderma harzianum FP108 were examined during the hydrolysis of semi- crystalline cellulose (Avicel). Since CBM6 is recognized as having a high affinity for amorphous cellulose, it was hypothesized that this affinity could enhance the synergistic effect between the endo- and exo-cellulases by focusing the action to Cel5B+CBM6 on the amorphous regions of the Avicel substrate. The increased activity of Cel5B+CBM6 over Cel5B alone was confirmed. However, in contrast to our expectations, a synergistic effect was not observed between either endo- and exo-cellulase pairs. From the obtained hydrolysis yield, it was inferred that Cel5B+CBM6 may have exo-type activity that caused a competitive interaction with the exo-cellulase, which resulted in no synergy.

scholarly journals Enhancing the sugars production yieldby supporting H3PW12O40 heteropoly acid on activated carbon for use as catalyst in hydrolysis of cellulose

2018 ◽  
Vol 23 (4) ◽  
Author(s):  
Saulo do Amaral Carminati ◽  
Ana Carolina Cunha Arantes ◽  
Anna Cláudia Santos de Oliveira ◽  
Maria Lucia Bianchi
Keyword(s):  
Activated Carbon ◽  
Heteropoly Acid ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

scholarly journals Quantitative evaluation of ball-milling effects on the hydrolysis of cellulose catalysed by activated carbon

2014 ◽  
Vol 4 (8) ◽  
pp. 2312-2317 ◽  
Author(s):  
Mizuho Yabushita ◽  
Hirokazu Kobayashi ◽  
Kenji Hara ◽  
Atsushi Fukuoka
Keyword(s):  
Activated Carbon ◽  
Ball Milling ◽  
Quantitative Evaluation ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

Synergistic Effect of Nitric Acid Modified and Cu(II)-Loaded Activated Carbon on Catalytic Ozonation

2014 ◽  
Vol 1073-1076 ◽  
pp. 708-711
Author(s):  
Jing Zhang ◽  
Ya Wei Du ◽  
Xiao Jing Liu ◽  
Yu Wen Zhou ◽  
Chun Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Nitric Acid ◽  
Synergistic Effect ◽  
Functional Groups ◽  
Catalytic Ozonation ◽  
Reusable Catalyst ◽  
Surface Functional Groups ◽  
Acid Modification ◽  
Toc Removal

The surface properties and performance of activated carbon (AC) used for catalytic ozonation were investigated after nitric acid modification (N-AC) and Cu (II)-loaded (N-Cu-AC). The results showed that the nitric acid modification could increase the amount of surface functional groups of AC. As a result, the adsorption capacity and catalytic activity of AC could be improved. The surface functional groups and Cu (II)-loaded of N-Cu-AC showed a synergistic effect on catalytic ozonation, where the catalytic activity of Cu (II)-loaded was more stable. N-Cu-AC was an effective and reusable catalyst for catalytic ozonation. The highest TOC removal efficiency of 58.0% could be achieved when N-Cu-AC was used for 60 min-catalytic ozonation treatment of acid red 3R.

scholarly journals Conditions of hydrolysis with a specific pair of endo- and exo-cellulases

2021 ◽  
Author(s):  
Yoshiki Kitano
Keyword(s):  
Synergistic Effect ◽  
Crystalline Cellulose ◽  
Carbohydrate Binding ◽  
Amorphous Cellulose ◽  
Potential Synergy ◽  
Hydrolysis Of Cellulose ◽  
Potential Alternative ◽  
Specific Pair ◽  
Hydrolysis Of ◽  
Increased Activity

Enzymatic hydrolysis of cellulose is a technology involved in the production of bioethanol, a potential alternative renewable energy. Many cellulases with endo- and exo- type of activity are known to hydrolyze cellulose synergistically. In this thesis, potential synergy between an endo-cellulase, Cel5B, with and without a carbohydrate- binding module (CBM6), and a new exo-cellulase, CBH1, from Trichoderma harzianum FP108 were examined during the hydrolysis of semi- crystalline cellulose (Avicel). Since CBM6 is recognized as having a high affinity for amorphous cellulose, it was hypothesized that this affinity could enhance the synergistic effect between the endo- and exo-cellulases by focusing the action to Cel5B+CBM6 on the amorphous regions of the Avicel substrate. The increased activity of Cel5B+CBM6 over Cel5B alone was confirmed. However, in contrast to our expectations, a synergistic effect was not observed between either endo- and exo-cellulase pairs. From the obtained hydrolysis yield, it was inferred that Cel5B+CBM6 may have exo-type activity that caused a competitive interaction with the exo-cellulase, which resulted in no synergy.

scholarly journals Directional Synthesis of Furfural Compounds From Holocellulose Catalyzed by Sulfamic Acid

2021 ◽  
Author(s):  
Yuchan Lu ◽  
Qiao He ◽  
Qiao Peng ◽  
Wenhai Chen ◽  
Guozhi Fan ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Active Sites ◽  
Sulfamic Acid ◽  
Volume Ratio ◽  
Corn Cob ◽  
Catalyst Amount ◽  
Solvent Type ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of ◽  
Direct Hydrolysis

Abstract The coproduction of 5-hydroxymethylfurfural (5-HMF) and furfural (FUR) via the direct hydrolysis of holocellulose analogue composed of cellulose and hemicellulose was investigated. The effects of catalyst amount, solvent type and amount, reaction temperature and time using sulfamic acid with dual active sites as catalyst were also studied. The yields of 5-HMF and FUR at 37.2% and 62.0% were obtained with the volume ratio of γ-valerolactone to water of 25:1 at 180 oC for 3 h. The conversion of corn cob holocellulose and wheat straw holocellulose to furfural compounds was then carried out under the identical conditions. Yields of 5-HMF at 26.6% and 28.5%, and yields of FUR at 34.5% and 26.1% were obtained, respectively. A possible mechanism for the coproduction of 5-HMF and FUR from holocellulose was proposed. It is believed that there is a synergistic effect between the hydrolysis of cellulose and hemicellulose during the conversion of holocellulose.

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