预吸附微波合成纳米NaY沸石晶种制备NaY型分子筛膜

NaY Zeolite Membrane Prepared by Using Pre-absorbed Nanosized NaY Zeolite Synthesized by Microwave Heating

在常压回流的微波加热体系中成功地合成出纳米尺寸的 Na Y分子筛 ,XRD和 SEM等表征结果表明 ,分子筛具有 40 nm左右的平均晶粒尺寸 .以其为晶种 ,预吸附在多孔氧化铝载体上 ,结合原位水热法进行二次晶化 ,制备出较为致密的 Na Y分子筛膜 ,该膜主要以孪生聚晶的形式存在 .CO2 /N2 气体分离测试结果显示 ,随着温度的升高 ,分子筛膜的气体分离能力呈上升趋势 ,在 1 40℃时真实选择分离系数达到最大值4.0 .

Nanosized NaY zeolite was successfully synthesized by microwave heating at an ambient pressure and under reflux. The XRD and SEM results indicate that the resulted NaY zeolite has an average crystal size of 40 nm. The compact NaY zeolite membranes consisting of twinborn and polycrystalline crystal were synthesized on a porous alumina substrate by using pre-absorbed nanosized NaY zeolite obtained above and then by being combined with a secondary in situ synthesis. The measuring result for the separation of CO 2/N 2 mixture show that the separating selectivity increased with increasing temperature, and reached a maximum of 4.0 at 140 ℃.