Applications of functionalized SBA-15 nanoparticles in hydrolysis of cellulose
Date Issued
2016
Date
2016
Author(s)
Lai, Yu-Kai
Abstract
Although mineral acids and cellulases are the most common catalysts for the hydrolysis of cellulose into glucose, they possess serious problems such as reactor corrosion, waste treatment and poor recyclability for the mineral acids, and high cost, low efficiency and long reaction time for cellulases. In order to overcome the above-mentioned drawbacks, solid acid catalysts, which have the advantages of easy product separation, recyclability, and less damage to the reactor, have attracted great attention in recent years. Ionic liquids have been considered green media for dissolving cellulose by breaking the inter- and intra-molecular H-bonds of cellulose chains. In order to recycle ionic liquids, two alkylimidazolium salts were immobilized onto SBA-15 nanoparticles (abbreviated SBA-15n). The functionalized SBA-15 nanoparticles were examined with powder-XRD, N2 sorption, TGA, EA, SEM and solid-state NMR. The yield of the hydrolysis product was analyzed by HPLC. In this study, the influence of immobilized ionic liquids and the tether length of imidazolium chloride (abbreviated as SBA-15n-IL3 and SBA-15n-IL6) in cellulose hydrolysis catalyzed by PrSA-SBA-15n was studied. In this study, cellulose was hydrolyzed using PrSA-SBA-15n as the catalysts, and the presence of ionic liquid functionalized SBA-15n could reduce the production of oligosaccharides and enhance the yield of glucose. In addition, SBA-15n-IL3 has higher glucose yield than SBA-15n-IL6 in the hydrolysis of cellulose. The optimal 33.0% glucose yield was obtained after 4.5 h hydrolysis of cellulose at 180 °C in the presence of PrSA-SBA-15n and SBA-15n-IL3 in 1:1 weight ratio.
Subjects
SBA-15
ionic liquid
cellulose
hydrolysis
Type
thesis
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