钾掺杂的锐钛矿TiO2催化丙酸酮基化反应
Ketonization of propionic acid on potassium-doped anatase TiO2 catalysts
黄胶 1王华 1韩金玉 1祝新利1
作者信息
- 1. 天津大学 化工学院,天津 300072
- 折叠
摘要
酮基化反应是转化生物质衍生羧酸的有效途径之一.为了提高酮基化反应活性和选择性,使用等体积浸渍法制备了不同钾(K)掺杂量的TiO2 催化剂,并探究其催化丙酸酮基化反应性能.通过X-射线粉末衍射、透射电子显微镜和X-射线光电子能谱等方法对催化剂的物化性质进行表征.结果表明,TiO2、0.05K(掺杂K的质量分数为 5%)催化剂的本征反应速率分别为 549.2 μmol·g-1·min-1、2 686.2 μmol·g-1·min-1,K的掺杂显著提高了反应活性,并且在丙酸完全转化时,0.05K催化剂的 3-戊酮选择性(99.9%)高于TiO2 催化剂(96.2%).根据X射线光电子能谱的表征,TiO2 和钾氧化物之间存在明显的相互作用,促进了表面氧空位的生成从而提高反应活性.
Abstract
Ketonization reaction is one of the effective approaches for converting biomass derived carboxylic acids.To improve the activity and selectivity of ketonization,TiO2 catalysts with different K doping amounts were prepared using an incipient wetness impregnation method and their catalytic performance for ketonization of propionic acid was studied.The physicochemical properties of the catalysts were characterized by X-ray powder diffraction(XRD),transmission electron microscopy(TEM)and X-ray photoemission spectroscopy(XPS).The results showed that the intrinsic ketonization reaction rates of TiO2 and 0.05K(with 5%K doping on TiO2)catalysts were 549.2 and 2 686.2 μmol·g-1·min-1,respectively,indicating that doping K significantly improved the activity of TiO2.Moreover,the selectivity of 3-pentanone on the 0.05K catalyst(99.9%)was higher than that on TiO2(96.2%)when propionic acid was completely converted.Based on XPS results,there is a significant interaction between TiO2 and potassium oxide,which promotes the formation of surface oxygen vacancies and thus enhances the activity.
关键词
酮基化/TiO2/钾/丙酸/3-戊酮Key words
ketonization/TiO2/potassium/propionic acid/3-pentanone引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据