amberlyst 70
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2021 ◽  
Vol 508 ◽  
pp. 111584
Author(s):  
Liangtu He ◽  
Lei Liu ◽  
Yuzhang Huang ◽  
Xinge Miao ◽  
Christophe Len ◽  
...  


Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 79 ◽  
Author(s):  
Nicola Di Fidio ◽  
Anna Maria Raspolli Galletti ◽  
Sara Fulignati ◽  
Domenico Licursi ◽  
Federico Liuzzi ◽  
...  

Lignocellulosic biomass represents one of the most important feedstocks for future biorefineries, being a precursor of valuable bio-products, obtainable through both chemical and biological conversion routes. Lignocellulosic biomass has a complex matrix, which requires the careful development of multi-step approaches for its complete exploitation to value-added compounds. Based on this perspective, the present work focuses on the valorization of hemicellulose and cellulose fractionsof giant reed (Arundo donax L.) to give second-generation sugars, minimizing the formation of reaction by-products. The conversion of hemicellulose to xylose was undertaken in the presence of the heterogeneous acid catalyst Amberlyst-70 under microwave irradiation. The effect of the main reaction parameters, such as temperature, reaction time, catalyst, and biomass loadings on sugars yield was studied, developing a high gravity approach. Under the optimised reaction conditions (17 wt% Arundo donax L. loading, 160 °C, Amberlyst-70/Arundo donax L. weight ratio 0.2 wt/wt), the xylose yield was 96.3 mol%. In the second step, the cellulose-rich solid residue was exploited through the chemical or enzymatic route, obtaining glucose yields of 32.5 and 56.2 mol%, respectively. This work proves the efficiency of this innovative combination of chemical and biological catalytic approaches, for the selective conversion of hemicellulose and cellulose fractions of Arundo donax L. to versatile platform products.



Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 675 ◽  
Author(s):  
Giulia Lavarda ◽  
Silvia Morales-delaRosa ◽  
Paolo Centomo ◽  
Jose M. Campos-Martin ◽  
Marco Zecca ◽  
...  

Several sulfonated cross-linked copolymers functionalized with hydroxyl and carboxylic groups have been synthesized. The amount of the cross-linking monomer was tailored (from 4% up to 40%) to tune the resulting micro- and nano-morphologies, and two types of catalysts, namely, gel-type and macroreticular catalysts, were obtained. These copolymers were employed in the catalytic hydrolysis of wheat straw pretreated in 1-ethyl-3-methylimidazolium acetate to obtain sugars. Remarkably, the presence of additional oxygenated groups enhances the catalytic performances of the polymers by favoring the adsorption of β-(1,4)-glucans and makes these materials significantly more active than an acidic resin bearing only sulfonic groups (i.e., Amberlyst 70). In addition, the structure of the catalyst (gel-type or macroreticular) appears to be a determining factor in the catalytic process. The gel-type structure provides higher glucose concentrations because the morphology in the swollen state is more favorable in terms of the accessibility of the catalytic centers. The observed catalytic behavior suggests that the substrate diffuses within the swollen polymer matrix and indirectly confirms that the pretreatment based on dissolution/precipitation in ionic liquids yields a substantial enhancement of the conversion of lignocellulosic biomass to glucose in the presence of heterogeneous catalysts.





AIChE Journal ◽  
2017 ◽  
Vol 63 (9) ◽  
pp. 3966-3978 ◽  
Author(s):  
Carlos Casas ◽  
Roger Bringué ◽  
Carles Fité ◽  
Montserrat Iborra ◽  
Javier Tejero


AIChE Journal ◽  
2015 ◽  
Vol 62 (1) ◽  
pp. 180-194 ◽  
Author(s):  
María Ángeles Pérez-Maciá ◽  
Roger Bringué ◽  
Montserrat Iborra ◽  
Javier Tejero ◽  
Fidel Cunill


RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80346-80352 ◽  
Author(s):  
Luqman Atanda ◽  
Adib Silahua ◽  
Swathi Mukundan ◽  
Abhijit Shrotri ◽  
Gilberto Torres-Torres ◽  
...  

A combination of TiO2–ZrO2 and Amberlyst 70 remarkably catalyzes glucose conversion to HMF in a biphasic media.



2014 ◽  
Vol 246 ◽  
pp. 71-78 ◽  
Author(s):  
R. Bringué ◽  
E. Ramírez ◽  
M. Iborra ◽  
J. Tejero ◽  
F. Cunill
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