School of Chemistry & Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China.
J Colloid Interface Sci. 2011 Sep 15;361(2):521-6. doi: 10.1016/j.jcis.2011.06.020. Epub 2011 Jun 13.
Hierarchical nanocrystalline ZSM-5 zeolite (NZ5) was synthesized at 100 °C under atmospheric pressure using methylamine as a mineralizing agent. The crystallization process of NZ5 was characterized by dynamic light scattering (DLS), X-ray diffraction (XRD), and infrared spectroscopy (FTIR). The results of contrastive experiments showed that evaporation of the solvent promoted the aggregation of primary particles, and the addition of methylamine accelerated the crystallization process. The NZ5 aggregate consisted of 20 nm individual particles, as shown in scanning electron microscope (SEM). The lattice fringes in the transmission electron microscope (TEM) images and the XRD results indicated that individual particles of NZ5 were highly crystalline. N(2) adsorption-desorption isotherms showed that NZ5 had high BET surface areas with mesopores having a mean diameter of about 9 nm. NZ5 exhibited a long lifetime, a stable and high yield of liquid hydrocarbons, and a high anti-coking performance in methanol-to-hydrocarbons reaction. Catalytic testing and TGA results showed that the lifetime of NZ5 was about ten times longer than that of micro-sized ZSM-5 zeolite (MZ5), and the average coking rate with NZ5 was one fifth over that of MZ5.
在 100°C 和常压下，使用甲胺作为矿化剂合成了层状纳米 ZSM-5 沸石（NZ5）。采用动态光散射（DLS）、X 射线衍射（XRD）和红外光谱（FTIR）对 NZ5 的结晶过程进行了表征。对比实验结果表明，溶剂的蒸发促进了初级粒子的聚集，而甲胺的添加则加速了结晶过程。SEM 显示 NZ5 聚集体由 20nm 的单个颗粒组成。TEM 图像中的晶格条纹和 XRD 结果表明，NZ5 的单个颗粒具有很高的结晶度。N2 吸附-脱附等温线表明，NZ5 具有高的 BET 比表面积和平均直径约为 9nm 的中孔。NZ5 在甲醇制烃反应中表现出长寿命、稳定且高的液体烃产率和高抗结焦性能。催化测试和 TGA 结果表明，NZ5 的寿命比微尺度 ZSM-5 沸石（MZ5）长约 10 倍，并且 NZ5 的平均结焦速率比 MZ5 低五分之一。
