α-MoO3的结构形貌与其催化合成季戊四醇正辛酸酯的构效关系研究
The Structural Morphology of α-MoO3 and its Structure-activity Relationship for Catalytic Production of Pentaerythritol n-Octanoate Ester
谭益凤 1曹平 1李莹 2马楷 3王雨恒 1李金桐1
作者信息
- 1. 重庆理工大学化学化工学院,重庆 400054
- 2. 贵州天威建材科技有限责任公司,贵州贵阳 550009
- 3. 中国石化润滑油有限公司合成油脂分公司,重庆 400039
- 折叠
摘要
通过溶胶-凝胶法制备一种用于季戊四醇(PER)和正辛酸(OTA)酯化合成季戊四醇正辛酸酯(POE)的α-MoO3催化剂.采用XRD、SEM、XPS和FITR分析手段对α-MoO3粉体进行了表征.结果表明,焙烧温度对α-MoO3的晶相结构、表观形貌及催化性能的影响显著.当焙烧温度达到450 ℃时,催化剂为正交晶面结构(021)和(110)同时择优取向的α-MoO3,样品表面光洁平整、大小均匀、分散性好,同时表现出较高的催化活性.在适宜的反应条件下(T=200 ℃,t=4 h,酸醇摩尔比 n(OTA):n(PER)=4.0:1,催化剂用量 n(α-MoO3-450):n(PER)=0.005),PER转化率可达98.8％,POE的选择性可达100％.
Abstract
Molybdenum trioxide(MoO3)catalyst,which was used for esterification of pentaerythritol(PER)and n-octanoate acid(OTA)to pentaerythritol n-octanoate ester(POE),was prepared by sol-gel method.The α-MoO3 catalyst was produced using the sol-gel technique and temperature control.The structure and morphology of the samples were characterized by XRD,SEM,XPS and FITR.The results showed that calcination temperature had significant influence on crystalline structure,apparent morphology and catalytic properties of α-MoO3.When the calcination temperature is 450 ℃,α-MoO3 with preferred orientation of(021)and(110)crystal planes.The α-MoO3 powder has smooth surface,uniform size and good dispersion and exhibits high catalytic activity.When esterification reaction was carried out at 200 ℃,the molar ratio of n-octanoate to pentaerythritol(n(OTA)/n(PER))of 4,reaction time of 4 h,and n(α-MoO3-450)/n(PER)of 0.005,the conversion of PER can be 98.8％,and the selectivity of pentaerythritol n-octanoate ester is 100％.
关键词
α-MoO3/溶胶-凝胶法/焙烧温度/结构形貌/酯化反应Key words
α-MoO3/sol-gel method/calcination temperature/microstructure and morphology/catalytic performance引用本文复制引用
基金项目
重庆市教委基于新工科背景的绿色化学教育教学研究项目(03335)
出版年
2024
NETL
NSTL
万方数据