Cr/SBA-15的优化合成及其环己烷氧化性能研究
Optimal synthesis of highly ordered Cr/SBA-15 and their application in cyclohexane oxidation reaction
徐倩 1董朝阳 1潘大海 1李瑞丰1
作者信息
- 1. 太原理工大学化学化工学院能源化工与催化研究中心,山西太原030024
- 折叠
摘要
采用高温水热嫁接的方法,通过调节反应溶液的pH和水热处理温度,成功地将金属铬离子嫁接到SBA-15氧化硅骨架上,制备得到高度规整有序的介孔孔道结构的Cr/SBA-15催化剂,并研究了Cr/SBA-15在以乙腈为溶剂,H2O2为氧化剂的环己烷催化氧化反应中的性能.结果表明,当pH =3,Si/Cr摩尔比为15时,合成的Cr/SBA-15催化剂具有高度有序的二维六方介孔结构,同时表现出良好的催化活性和选择性.反应温度为80℃,反应时间为4h条件下,环己烷催化氧化的转化率可达17％,环己酮和环己醇的选择性分别为65％、35％.Cr/SBA-15催化剂重复使用3次后活性基本不变,表明该催化剂具有良好的稳定性.
Abstract
Highly ordered mesoporous Cr/SBA-15 is successfully prepared by homogenously grafting a large amount of chromium species onto SBA-15 framework through high temperature hydrothermal grafting approach.The performance of Cr/SBA-15 in oxidation of cyclohexane is evaluated using acetonitrile as the solvent and H2O2 as oxidant.The results suggest that Cr/SBA-15 prepared with 3 of pH and 15 of Si/Cr has highly ordered two-dimensional hexagonal mesostructure,which has higher activity and selectivity in oxidation of cyclohexane.Cyclohexane conversion rate can be up to 17％.The selectivity of cyclohexanone and cyclohexanol are 65％ and 35％,respectively,by reacting at 80℃ for 4 hours.The activity of Cr/SBA-15 remains unchanged after being reused for three times,indicating good stability of the catalyst.
关键词
环己烷氧化/介孔材料/Cr/SBA-15/水热嫁接Key words
cyclohexane oxidation/mesoporous materials/Cr/SBA-15/hydrothermal grafting引用本文复制引用
基金项目
国家自然科学基金(51172154)
国家自然科学基金(51451002)
山西省青年基础研究基金(2012021006-2)
山西省青年基础研究基金(2013021008-3)
出版年
2016
NETL
NSTL
维普
万方数据