新型碳基固体强酸催化剂在高酸值生物柴油中的催化性能

Catalytic Performance of New Type Carbon-Based Strong Solid Acid Catalyst in Biodiesel Feedstock With High Acid Value

通过膨化淀粉和对-甲基苯磺酸混合物的部分炭化制备了新型碳基固体强酸催化剂,研究了新型碳基固体强酸催化剂在油酸与乙醇的酯化反应中的催化性能,考察了乙醇与油酸摩尔比、催化剂质量浓度和反应时间等因素对收率的影响。结果表明,新型碳基固体强酸在油酸与乙醇的酯化中具有较好的催化活性,在醇酸的摩尔比8:1、w(催化剂)为5.0%和回流反应时间6.0h的条件下,油酸乙酯收率可达83.78%,经过6次使用,催化剂保持良好的催化活性。

Amorphous carbon-based material prepared from expanded starch and p-toluene sulfonic acid has been examined as a novel strong solid acid catalyst. The catalytic performances were studied on esterification of oleic acids with ethanol. The effects of molar ratio of alcohol with oleic acid, catalyst concentration and reaction time were discussed. The results of XRD and acid-base titration indicated the incompletely carbonization of the mixtures of expanded starch and p-toluene sulfonic acid results in amorphous carbon consisting of small polycyclic aromatic carbon sheets. The results indicate that carbon- based catalysts are highly effective, minimally polluting and reusable catalysts that are highly suited to the production of biodiesel from waste oils with a high acid value. When the esterification reaction was carried out with molar ratio of ethanol to oleic acid of 8 ： 1, reaction time of 6.0 h and ω（catalyst） 5.0% ,the maximum yield of ethyl oleate was 83.78%. There was very little change in the catalytic activity of the regenerated catalyst, even after six cycles.