固体碱K_2CO_3/Mg-Al-O催化酯交换制备生物柴油  

Preparation of Biodiesel by Transesterification over K_2CO_3/Mg-Al-O Solid Base Catalyst

作　　者：周小伟[1,2] 刘桂英[1] 邢子龙[1,3] 曲旭坡 杜长海[1] 

机构地区：[1]长春工业大学化工学院,吉林长春130012 [2]中国石油集团东北炼化工程有限公司吉林设计院,吉林吉林132002 [3]中国石油吉林油田公司新立采油厂,吉林前郭131109

出　　处：《广东化工》2014年第3期9-10,共2页Guangdong Chemical Industry

摘　　要：以镁铝水滑石为前驱体,经焙烧后得到的镁铝复合氧化物为载体,制备了负载型K2CO3/Mg-Al-O固体碱催化剂,并用于大豆油酯交换合成生物柴油反应中。研究了活性组分K2CO3负载量对催化剂结构和性能的影响。结果表明,在K2CO3负载量为30%时,形成的钾铝氧化物种是催化剂强碱中心和活性提高的主要原因。考察了反应条件对催化剂性能的影响,在反应温度60℃、时间6 h、醇油摩尔比12∶1和催化剂用量2.0%的条件下,生物柴油收率最高为88.5%,催化剂具有较好的稳定性。Catalyst precursor Mg-AI hydrotalcite was prepared by coprecipitation and then the Mg-Al-O carrier was prepared by calcination. A series of Mg-AI-O supported K2CO3 catalysts were prepared to catalyze the transesterification of soybean oil for producing biodiesel. It is shown that the increased basic property and catalytic activity of K2CO3/Mg-Al-O catalyst loaded with 30 % K2CO3 are attributed to the new K-O-Al species produced by the interaction between support and K2CO3. The yields of biodiesel can reach 88,5 % under the conditions of reaction temperature 60 ℃, time 6 h, methanol / oil molar ratio 12：1 and catalyst amount 2.0 %.

关 键 词：K2CO3 Mg-Al-O固体碱 生物柴油 镁铝复合氧化物 

分 类 号：TQ645[化学工程—精细化工]