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Title: Synthesis and Characterization of Sulfonated Carbon Catalyst for Hydrolysis of Microcrystalline Cellulose
???metadata.dc.contributor.*???: Beteley Tekola (PhD)
Kefyalew, Hailemariam
Keywords: Bamboo sawdust;Sulfonated biochar catalyst;microcrystalline cellulose;hydrolysis reaction
Issue Date: Jun-2017
Publisher: AAU
Abstract: Microcrystalline cellulose can be converted into valuable products such as glucose via hydrolysis reaction at mild condition using sulfonated carbon catalyst. A sulfonated carbon material was prepared by carbonization of bamboo sawdust followed by sulfonation. Prepared catalyst was studied for its ability to catalyze microcrystalline cellulose yield via hydrolysis reaction. Three carbon-based catalysts at three different temperatures (400, 450 and 500℃) were prepared. Investigations on the sulfonated carbon catalyst were conducted to determine the effect of reaction time (4, 6 and 8 hr), reaction temperature (120, 135 and 150℃) and catalyst to microcrystalline cellulose (1:1, 1.25:1 and 1.5:1) on the hydrolysis reaction. The sulfonated catalysts were characterized using the following analyses: elemental analysis, total acid density, FT-IR, TGA, SEM and XRD. Based on the above characterization results, sulfonated carbon prepared at 500℃ and sulfonated via ultrasonication was found to have higher acid density that is suitable to catalyze the hydrolysis reaction. The first step in catalyst development approach was to increase the hydrolysis reaction by employing a stronger sulfonation procedure during catalyst preparation. The total acid density obtained for sulfonated carbon catalyst at 500℃ was 4.16 mmol/g which significantly increases glucose yield. According to the FTIR analysis the sulfonated biochar contained sulfonic, carboxylic, and phenolic groups, which are responsible for the exhibited high catalytic performance during hydrolysis of cellulose. The yield of glucose obtained was 60.5% at 149.0°C in 8hr reaction time.
Appears in Collections:Thesis - Process Engineering

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