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.
LEV molecular sievenanosized crystalfacile synthesisaciditytextural property
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