纳米LEV分子筛的简易合成
FACILE SYNTHESIS OF NANOSIZED LEV MOLECULAR SIEVE
付文华 1赵胜利 1张铁柱 1王振东 1杨为民1
作者信息
- 1. 中石化(上海)石油化工研究院有限公司,绿色化工与工业催化全国重点实验室,上海 201208
- 折叠
摘要
以异丙基三甲基铵为结构导向剂制备了不同硅铝比的纳米LEV分子筛,考察铝源种类、碱金属离子、硅铝比、碱度等合成条件对产物性能的影响.研究发现:以偏铝酸钠为铝源、氢氧化钠为碱源有利于纳米LEV分子筛的合成;通过调控碱度可以在n(SiO2)/n(Al2O3)为20～150的范围内制备得到纳米LEV分子筛;随着硅铝比升高,LEV分子筛总酸量降低,而酸强度则逐渐升高.合成的纳米LEV分子筛具有高比表面积和微孔体积,总孔体积可达1.0 cm3/g以上,有望在吸附分离及有机物选择性催化转化方面实现应用.
Abstract
In this contribution,we reported facile preparation of nano-sized LEV molecular sieve with various n(SiO2)/n(Al2O3)by using isopropyltrimethylammonium as structure-directing agent for the first time.The effect of aluminum sources,alkali cations,initial n(SiO2)/n(A12O3)and alkalinity on the products outcome was investigated.It turns out that sodium aluminate and sodium hydroxide are beneficial to the crystallization of nano-sized LEV molecular sieve.LEV molecular sieve could be obtained with initial n(SiO2)/n(Al2O3)ranging from 20 to 150,by modulating the alkalinity of the initial gel.The total acid amount drops with the increasing of n(SiO2)/n(Al2O3),while the acid strength enhances.The nano-sized LEV molecular sieve has high specific area and micropore volume.Moreover,the total pore volume exceeds 1.0 cm3/g,which is extremely high.This type of molecular sieve material is endowed with high application potential in adsorptive separation and selective conversion of organic molecules,thanks to its nano-sized dimension,strong acidity as well as high surface area and pore volume.
关键词
LEV分子筛/纳米晶体/简易合成/酸性/孔结构性质Key words
LEV molecular sieve/nanosized crystal/facile synthesis/acidity/textural property引用本文复制引用
基金项目
国家自然科学基金(22272201)
国家自然科学基金(21802168)
上海市启明星计划(23QB1406300)
出版年
2024
NETL
NSTL
维普
万方数据