Synthesis of TBA–Silicalite-2 Zeolite Nanocrystals
Synthesis of TBA–Silicalite-2 Zeolite Nanocrystals
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DOI：
10.1246/cl.2001.516
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发表时间：
2001-06
影响因子：
1.6
通讯作者：
DongJun-ping;SunYao-Jun;LongYing-cai
中科院分区：
文献类型：
--
作者：
DongJun-ping;SunYao-Jun;LongYing-cai
在 TBAOH-TEOS-H2O 反应体系中水热合成平均粒径小于 100 nm 的硅质 MEL 型（silicalite-2）沸石纳米晶。通过 XRD、SEM、13C 和 29Si MAS NMR、FT-IR 和 N2 吸附研究表明，纳米晶是不与 MFI (silicalite-1) 沸石共生的初级颗粒聚集体，骨架中具有约 34% 的硅烷醇基团以及约 0.9 mL·g−1 的介孔体积。 Silicalite-2 纳米晶体表现出特殊的结构特征：红外光谱分裂在 550 cm−1 处振动； TBAOH的甲基信号在13C MAS CP NMR谱中呈单线态，与silicalite-2单晶不同。
Siliceous MEL-type (silicalite-2) zeolite nanocrystals with average particle size of less than 100 nm were hydrothermally synthesized in a reactant system of TBAOH–TEOS–H2O. Investigation by using XRD, SEM, 13C and 29Si MAS NMR, FT-IR and N2 adsorption shows that the nanocrystals are aggregates of primary particles free of intergrowth with MFI (silicalite-1) zeolite, and possess ∼ 34% silanol groups in the framework as well as ∼0.9 mL·g−1 of mesopore volume. Silicalite-2 nanocrystals exhibit the particular structural characteristics: vibration at 550 cm−1 in IR spectrum splits; the signal of methyl group of TBAOH in 13C MAS CP NMR spectrum appears as singlet, which is different from that of silicalite-2 single crystals.