Silicalite-1分子筛纳米晶粒的微波控制合成与表征

Controlled synthesis and characterization of Silicalite-1 nanocrystals by microwave

采用微波法控制合成Silicalite-1纳米分子筛晶粒,研究微波时间对Sillcalite-1形成过程等微观性质的影响。通过调变晶化时间控制合成不同结晶度、粒径的Silicalite-1分子筛晶粒,为发展二次生长法合成分子筛膜的研究探索了一条合成晶种的新途径。结果表明,合成液经60℃恒温陈化24 h后,在相对温和的微波环境中(100℃)分子筛晶体形成缓慢,逐渐由无定形物质向Silicalite-1转变,相对结晶度随晶化时间延长而增大。微波150～240 min可合成粒径70～130 nm,相对结晶度82.4%～90.2%不等的Silicalite-1分子筛纳米晶粒,满足晶种法合成分子筛膜对不同晶种的需求。

Abstract： Controlled synthesis Silicalite-1 zeolite nanocrystals by microwave, the influence of microwave irradiation time on the forming process and microscopic properties of Silicalite-1 was studied. The different particle size and crystallinity of Silicalite-1 zeolite crystals can be controlled synthesis by varying the time of crystallization, which explore a new way for the synthesis of seeds which were used to synthesize zeolite films by secondary growth method. The results show that the Silicalite-1 crystals grow slowly under the relatively mild microwave environment （ 100 ℃ ）, the amorphous substance gradually changes to the Silicalite-1, and the relative crystallinity can increase with the extension of crystallization time. The Silicalite- 1 zeolite nanocrystals with size from 70 to 130 nm and different crystallinity from 82.4% to 90.2% were synthesized at 100 ℃ from 150 to 240 min, which can meet the demands of seeds which were used to synthesize zeolite films by secondary growth method.