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利用化学浸渍法将蔗糖负载到SBA-15介孔材料孔道内部,高温炭化形成的多聚苯环经发烟硫酸气相磺化处理后,得到磺酸基团功能化的新型碳-硅介孔复合材料.发烟硫酸气相磺化处理是该材料合成的关键步骤.X射线衍射、扫描电镜和氮气吸附结果表明,碳-硅介孔复合材料经磺酸化处理保持了高度有序的介孔结构.热重、傅里叶变换的红外光谱及吡啶吸附红外光谱结果证明,磺酸功能基团成功的嫁接于碳-硅介孔复合材料孔道的内表面,反应活性中心为Brφnsted酸,酸密度在0.09~0.70mmol/g可以有效调变.当碳负载量为35%时,该复合材料在生物柴油的绿色合成中显示出最优的催化性能,且可重复使用3次以上.

A carbon-mesoporous silica (CS) composite functionalized with sulfonic acid (-SO3H) groups was prepared by controlled carbonization of sucrose impregnated in SBA-15 mesoporous silica and its subsequent sulfonation.The moderate vapor phase sulfonation of the CS composite with fuming sulfuric acid (H2SO4·20%SO3) was the key step in preparing the strong acid solid material (CS-SO3H).Structural analysis and reaction data revealed that sulfonic acid groups were successfully incorporated into the mesoporous CS composite,and the Brφnsted acid site density was tunable from 0.09 to 0.70 mmol/g by tuning the carbon loading.The sample with 35 wt% carbon exhibited a remarkable catalytic activity for biodiesel production by the esterification of palmitic acid and the transesterification of soybean oil with methanol.

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