Ru-K-NaY催化草酸二甲酯脱羰基制备碳酸二甲酯
Ru-K-NaY catalyzed decarbonylation of dimethyl oxalate to dimethyl carbonate
张日东 1吕建华 1刘继东 1郭豹 1李文松1
作者信息
- 1. 河北工业大学化工学院,天津 300130
- 折叠
摘要
以NaY分子筛为载体,通过KNO3溶液对NaY分子筛进行预处理,记为K-NaY.之后采用过量浸渍的方法,制备了一系列不同Ru含量的Ru-K-NaY催化剂.并首次将其用于草酸二甲酯(DMO)脱羰基制备碳酸二甲酯(DMC)的反应中.研究了 Ru负载量和催化剂碱量对反应的影响.采用X射线光电子能谱(XPS)、BET和CO2程序升温脱附(CO2-TPD)等测试对Ru-K-NaY催化剂的表面、结构性能以及碱性性能进行了表征,确定了增加催化剂弱碱活性位点数量以及Ru0物种数量可以提高催化剂的催化活性,促进碳酸二甲酯的生成.以Ru-K-NaY作为催化剂,对反应条件进行了优化,在最佳反应条件下,DMO转化率和DMC选择性分别为83％和69％.最后研究了催化剂的稳定性,Ru-K-NaY催化剂循环使用5次后催化活性基本不变.
Abstract
A series of Ru-K-NaY catalysts with different Ru contents were prepared by using the method of excess impregnation which used NaY molecular sieves as carriers and pretreated by KNO3 solution.The catalysts were used for the first time in the reaction of decarbonylation of dimethyl oxalate(DMO)to prepare dimethyl carbonate(DMC).The effects of Ru loading and catalyst base on the reaction were investigated.The surface and structural properties as well as the alkaline properties of the Ru-K-NaY catalysts were characterized using XPS,BET and CO2-TPD,and it was determined that increasing the number of weak alkaline active sites as well as the number of Ru0 species of the catalysts could improve their catalytic activity and promote the generation of dimethyl carbonate.The reaction using Ru-K-NaY catalyst was optimized,yielding the DMO conversion and DMC selectivity were 83％and 69％,respectively.Finally,the stability test showed that the catalytic activity of the Ru-K-NaY catalyst was almost unchanged after 5 cycles.
关键词
沸石/催化剂/催化剂载体/碳酸二甲酯/钌Key words
zeolite/catalyst/catalyst support/dimethyl carbonate/ruthenium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