摘要
采用离子交换法制备了磷钨酸铜催化剂,应用X-射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、热重分析(TG)、扫描电镜(SEM)及N2-物理吸附脱附等技术手段对催化剂的结构及表面形貌进行了表征分析,并将其应用于油酸与甲醇的酯化反应中制备生物柴油,系统考察了各因素对酯化反应的影响。表征数据显示,磷钨酸铜催化剂保持了Keggin骨架结构,且具有介孔结构及较好的热稳定性。试验表明:在催化剂用量为质量分数5%,反应时间为3 h,油酸与甲醇摩尔比为1∶14,反应温度为70℃的条件下,转化率达87.3%。此外,磷钨酸铜重复使用4次后,转化率仍可达71.8%,表明催化剂具有较好的稳定性。
Copper phosphotungstic acid catalyst was prepared by ion exchange method.The structure and surface morphology of the catalyst were characterized by X-ray diffraction(XRD),Fourier Liye transform infrared spectroscopy(FT-IR),thermogravimetric analysis(TG),scanning electron microscopy(SEM)and N2-physical adsorption desorption.The catalyst was used to prepare biodiesel by eleic acid and methanol,and the effects of various factors on esterifi cation reaction were systematically investigated.The characterization data showed that copper phosphotungstic acid catalyst maintaind Keggin backbone structure,and had mesoporous structure and good thermal stability.The experimental results showed that the mass dosage of catalyst 5%,reaction time 3 h,molar ratio of oleic acid to methanol 1∶14,reaction temperature 70℃,under the condition the conversion rate reached 87.3%.In addition,the conversion rate of copper phosphotungstic acid could be 71.8%after repeated use of 4 times,which indicated that the catalyst had good stability.
作者
蔡杰
李倩
黄金术
张秋云
CAI Jie;LI Qian;HUANG Jin-shu;ZHANG Qiu-yun(Guizhou University,Guiyang 550025,Guizhou,China;Anshun University,Anshun 561000,Guizhou,China)
出处
《粮食与油脂》
北大核心
2018年第8期60-64,共5页
Cereals & Oils
基金
贵州省教育厅青年科技人才成长项目(黔教合KY字[2016]272号)
贵州省教育厅创新群体重大研究项目(黔教合KY字[2017]049号)
2017年省级大学生创新创业训练项目(201710667025)
安顺学院2017年度SRT项目
关键词
磷钨酸
掺杂
固体酸
生物柴油
酯化反应
phosphotungstic acid
doped
solid acid
biodiesel
esterifi cation
作者简介
蔡杰(1972—),男,高级实验师,研究方向为有机化学、现代分析技术。;通信作者:张秋云,男,讲师,研究方向为催化化学、农业生物质资源。
