硅藻土固载硅钨酸盐催化油酸甲酯化研究  

Study on the esterification of oleic acid catalyzed by diatomite supported silicotungstic acid salt

作　　者：张秋云 金佳幸 冯云梅 张玉涛 ZHANG Qiu-yun;JIN Jia-xing;FENG Yun-mei;ZHANG Yu-tao(School of Chemistry and Chemical Engineering,Anshun University,Anshun 561000,Guizhou,China;Engineering Technology Center of Contml and Remediation of Soii Contamination of Provincial Science&Technology Bureau,Anshun 561000,GuizZou,China)

机构地区：[1]安顺学院化学化工学院,贵州安顺561000 [2]贵州省科技厅土壤污染控制与修复工程技术中心,贵州安顺561000

出　　处：《粮食与油脂》2021年第8期61-65,共5页Cereals & Oils

基　　金：贵州省科学技术基金(黔科合基础[2020]1Y054);2018年度贵州省“千”层次创新型人才培养项目;贵州省教育厅科技拔尖人才支持计划项目(黔教合KY字[2018]069号)。

摘　　要：采用一锅法制备了硅藻土固载铁掺杂的硅钨酸(FeSiW/硅藻土)固体酸催化剂,使用傅里叶红外光谱(FT-IR)及扫描电子显微镜(SEM)对催化剂的结构及形貌进行了分析,结果发现铁掺杂的硅钨酸较好的分散在硅藻土的表面。将其应用于油酸与甲醇为反应物的生物柴油制备体系,催化活性研究发现在催化剂用量3%(以油酸质量为基准)、油酸与甲醇摩尔比为1:8、反应温度70℃、反应时间4 h的条件下,酯化反应转化率为72.5%,且催化剂重复使用6次后,转化率仍高于70%。此外,FeSiW/硅藻土催化剂还适用于催化各种长链羧酸的酯化反应。A solid acid catalyst(FeSiW/diatomite)comprising iron-doped silicotungstic acid and diatomite was synthesized via a one-pot method,and the structural and morphology characterization of the synthesized catalysts were characterized by Fourier transform infrared spectroscopy(FT-IR)and scanning electron microscopy(SEM).Characterization results showed that the iron-doped silicotungstic acid was well dispersed on the surface of diatomite.The obtained FeSiW/diatomite catalyst was applied for the esterification of oleic acid with methanol for the production of biodiesel.The results showed that the conversion rate of the esterification reaction was 72.5%,and the conversion rate was still higher than 70%after 6 reuses under the conditions of 3%catalyst dosage(based on the mass of oleic acid),molar ratio of oleic acid to methanol of 1:8,reaction temperature of 70℃and reaction time of 4 h.Moreover,the FeSiW/diatomite catalyst also could catalyze various esterification reactions of long-chain carboxylic acid.

关 键 词：硅钨酸 固载 硅藻土 酯化反应 

分 类 号：TS201.2[轻工技术与工程—食品科学]