摘要
通过沉淀、回流和浸渍分别制备了Al、Ga掺杂的SO42-/ZrO2固体酸催化剂,利用该促进型固体酸催化剂酯化预处理高酸值油脂,考察了固体酸焙烧温度、醇油摩尔比等因素对酯化反应的影响。结果表明,该类型固体酸对高酸值油脂具有良好的酯化反应活性,其中600℃焙烧的Ga2O3/SO42-/ZrO2在67℃下,醇与油摩尔比为30∶1,催化剂用量为4%,对初始酸值为32的油脂进行酯化反应,经8h反应,油脂酸值降为4.1,有利于后续用碱性催化剂对处理后的油脂进行酯交换反应生成生物柴油。
Gallium- and aluminum-promoted sulfated zirconia catalysts were prepared by hydrolysis, digestion, wetness impregnation and calcination. The surface acid properties of these catalysts were studied. The high acid value oil was pretreated by esterification on these promoted catalysts. The effects of calcining temperature, molar ratio of methanol to oil were analyzed. The experiment results show that these catalysts exhibit excellent catalytic activities. Under the following conditions： methanol/oil mole ratio 30, amount of catalyst 4%, reaction time 8 h, reaction temperature 67 ℃, the esterification rate on Ga2O3/SO4^2-/ZrO2 calicined at 600 ℃ was the highest and the acid value of oil decreased to 4. 1, which had a good effect on producing biodiesel by transesterification in the presence of alkaline catalyst.
出处
《应用化学》
CAS
CSCD
北大核心
2008年第5期613-616,共4页
Chinese Journal of Applied Chemistry
基金
江苏省高校自然科学基金(07KJD530075)
南京财经大学科研基金(B0613)资助项目
关键词
固体酸
预处理酯化
酸值
solid acid,pretreatment, esterification,acid value
