采用水热法制备了双层空心多孔碳微球(DHPCMs),以其为载体制备了含N的磺酸型双层碳微球基固体酸(DHPCMs-SPT)催化剂,将DHPCMs-SPT用于催化煎炸废油与甲醇合成生物柴油。通过扫描电子显微镜、透射电子显微镜、能量色散X射线光谱仪、X射线光电子能谱仪、同步热分析仪以及傅里叶变换红外光谱仪等对DHPCMs-SPT的形貌、结构、热稳定性及元素含量进行了分析表征。结果表明:DHPCMs-SPT经过改性仍具有双层空心结构,且在碳微球上引入了含N的磺酸基团,其比表面积为10.96m2/g,表面酸密度为12.5mmol/g;在反应温度110℃,催化剂/油(质量比)为1∶25,甲醇/油(摩尔比)为16∶1、反应时间4h条件下,脂肪酸甲酯产率达92.2%。
Bilayer hollow porous carbon microspheres (DHPCMs) were prepared by hydrothermal method,and then N-containing sulfonic acid bilayer carbon microsphere-based solid acid (DHPCMs-SPT) catalysts were prepared by using DHPCMs as the carrier.The DHPCMs-SPT was used to catalyze the synthesis of biodiesel from waste oil and methanol.The morphology,structure,thermal stability and element content of DHPCMs-SPT were analyzed by scanning electron microscope,transmission electron microscope,energy dispersive X-ray spectrometer,X-ray diffraction,synchronous thermal analyzer and Fourier transform infrared spectrometer.The results showed that DHPCMs-SPT still had a double-layer hollow structure after modification,and an N-containing sulfonic acid group was introduced into the carbon microspheres,with a specific surface area of 10.96m2/g and a surface acid density of 12.5mmol/g.Under the conditions of reaction temperature of 110℃,catalyst/oil (mass ratio) of 1∶25,methanol/oil (molar ratio) of 16∶1 and reaction time of 4h,the yield of fatty acid methyl ester reached 92.2%.
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基金资助
国家自然科学基金(21962001)
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