SBA-15的改性及催化文冠果油制备生物柴油

Preparation of bildiesel from sorbifolia oil catalyzed by modified SBA-15

以介孔分子筛SBA-15为载体,采用直接合成法和后合成法镀饰Al后再负载碱金属盐KNO3,制得负载型固体碱催化剂KNO3-AlSBA-15和KNO3-Al-SBA-15。用XRD、BET、SEM以及CO2-TPD对催化剂进行表征。结果表明:在SBA-15上镀饰Al可以保护分子筛的介孔结构;进一步负载KNO3,能够增强催化剂的碱性。将其应用于催化文冠果油酯交换制备生物柴油,结果显示催化剂KNO3-Al-SBA-15的催化活性最好,优于传统均相催化剂,所得生物柴油产率可达92%,重复使用多次仍具有较好的催化效果。

The supported solid base catalysts KNO3-AlSBA-15 and KNO3-Al-SBA-15,was prepated with mesoporous molecular sieve SBA-15 as carrier,and was loaded with Al and with alkali metal salts KNO3 by direct synthesis and post synthesis respectively.The catalysts were characterized by means of XRD,BET,SEM and CO2-TPD.The result showed that addition of Al had a good protection on the pore structure of catalyst.The alkalinity of catalyst was enhanced significantly after loading KNO3.The transesterification reaction process of sorbifolia oil with the catalyst for biodiesel preparation indicated that KNO3-Al-SBA-15 showed better catalytic activity than traditional catalysts.The biodiesel yield could reach 92%,and this catalyst also showed steady catalytic activity after being reused for many times.