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| Preparation and application of carbon-based solid acid catalyst derived from glycerol |
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| DOI： |
| KeyWord:carbon-based solid acid catalyst esterification glycerol sulfonated carbon biodiesel |
| FundProject:中央高校基本科研业务费专项资金资助(JUSRP51623A) |
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| Abstract: |
| A carbon material (CG) derived from glycerol was prepared by in-situ carbonization and sulfonation process first, and then the synthesized CG was sulfonated with H2SO4 at 140,160,180,190 ℃ for 2,5,10,12 h denoted as SCG-(x)-(y) catalyst(where x was the sulfonated temperature and y was the sulfonated time). The properties of the catalysts were characterized by XRD, FTIR, TGA, BET, SEM and TEM. The sulfonation time and sulfonation temperature in the catalysts’ synthesis process were investigated. The esterification of oleic acid and methanol was used as probe reaction to study the catalytic activity of the catalyst. The results showed that the sulfonic group was successfully introduced into the surface of carbon materials. With the increase of sulfonation temperature and sulfonation time, the number of sulfonic groups on the surface of the catalyst increased. When the sulfonation time was 10 h and the sulfonation temperature was 180 ℃, the catalyst showed the best reactivity. The total acid content of catalyst SCG-(180)-(10) was determined by indirect titration, and the total acid content was up to 35 236.21 μmol/g. Under the conditions of molar ratio of methanol to oleic acid 12∶ 1, catalyst dosage 5% of the total mass of raw materials, reaction temperature 80 ℃, and reaction time 0.5 h, the conversion rate of oleic acid reached 98.40%. The conversion rate of oleic acid remained above 90% after the catalyst was reused for five times. |
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