以桦木为模板制备了一系列La2O3/ZrO2固体碱催化剂.采用BET、XRD、XPS和SEM等技术手段对其进行了表征.结果表明,与浸渍法和共沉淀法制备的样品相比,所制得的复合氧化物具备桦木的生物形态,具有更高的比表面积、更小的晶粒尺寸、更大的孔径和孔容等特点.当La/Zr质量比为10％时,样品的碱性最高,催化性能最好.以所制复合氧化物为催化剂,考察小桐子油和甲醇的催化酯交换反应.结果表明,在醇油摩尔比72∶1,固体碱催化剂质量分数8％,反应温度200℃,反应时间6h的条件下,酯交换反应的甲酯转化率达93.6％.该样品具有一定的抗酸和抗水性.相同反应条件下,样品循环使用3次生物柴油收率仍为83％左右.
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