以碗状碳微球(BHC)为载体,合成了以烷基为磺酸基键合位点的丙磺酸型碗状碳微球(PA-CBHC-Si)。X射线光电子能谱仪、扫描电子显微镜和傅里叶变换红外光谱分析表明,三步改性分别逐步丰富BHC表面羧基(—COOH)、巯基(—SH)、磺酸基(—SO3H)官能团含量,且改性过程保留了载体的原始形貌。PA-CBHC-Si的酸密度高达8.5mmol/g,活性中心—SO3H于300℃开始分解,具有良好的热稳定性。PA-CBHC-Si可作为煎炸废油与甲醇酯交换反应的催化剂,醇油摩尔比为16∶1,剂油比为0.02的催化体系于130℃反应4h,脂肪酸甲酯产率为84.53%。
Propane sulfonic acid-type bowl-shaped microspheres (PA-CBHC-Si) with alkyl as sulfonic acid groups bonding sites were synthesized by using bowl-shaped carbon microspheres (BHC) as carrier.Analysis through XPS,SEM and FT-IR indicated that the three-step modification gradually enriched the content of carboxyl (—COOH),sulfhydryl (—SH) and sulfonic acid (—SO3H) functional groups on the surface of BHC,and the modification process retained the original basic morphology of the carrier.The acid density of PA-CBHC-Si was up to 8.5mmol/g,and the active sites of sulfonic acid groups (—SO3H) began to decompose at 300℃,which showed good thermal stability.The PA-CBHC-Si could be used as a good catalyst for transesterification reaction between waste frying oil and methanol.The yield of 84.53% for fatty acid methyl esters (FAMEs) would be obtained at 130℃ for 4h in a catalytic system with a molar ratio of methanol/oil of 16∶1 and the catalyst/oil ratio of 0.02.
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基金资助
国家自然科学基金(21962001)
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