摘要
采用浸渍法制备K_2CO_3/CaO固体碱催化剂,考察其催化甲醇-油脂-碳酸二甲酯三组分耦合反应体系制备无甘油生物柴油的性能。结果表明:在浸渍时间8 h、碳酸钾负载量5%、焙烧温度600℃时,该固体碱催化剂在常压回流、n(油)∶n(酯)∶n(醇)为1∶1∶8、催化剂用量15%的条件下,反应60 min生物柴油产率可达97.88%;反应得到的未经处理的生物柴油中游离甘油的含量仅为0.019 62%。采用TG、BET、SEM、CO_2-TPD及XRD等技术对该催化剂进行了表征发现,催化剂的高活性与碳酸钾和氧化钙经高温焙烧产生两个新的碱性位点有关。
The K2CO3/CaO solid base was prepared by impregnation method and its catalytic performance for biodiesel production in a tri - component system of rapeseed oil, dimethyl carbonate （ DMC ） and methanol was investigated. The results showed that under the conditions of impregnation time 8 h, load- ing amount of potassium carbonate 5%, calcination temperature 600℃, molar ratio of rapeseed oil to dimethyl carbonate to methanol 1： 1： 8, dosage of catalyst 15%, reaction time 60 min and atmospheric re- flux, the yield of biodiesel reached 97.88%. The content of free glycerol in biodiesel without treatment was only 0.019 62%. The catalyst was characterized by TG, BET, SEM, CO2 -TPD and XRD, and it was found that the high catalytic activity of K2CO3/CaO solid base catalyst was associated with the formation of two new basic sites, which were produced by the interaction between potassium carbonate and calcium oxide during calcination.
出处
《中国油脂》
CAS
CSCD
北大核心
2017年第2期50-55,共6页
China Oils and Fats
基金
国家自然科学基金(201306149)
陕西省教育厅专项科研计划项目(2013JK0646)
关键词
生物柴油
固体碱
三组分体系
biodiesel
solid base
tri - component system
