Details

Autor(en) / Beteiligte

• Ni, Youming
• Sun, Aiming
• Wu, Xiaoling
• Hai, Guoliang
• Hu, Jianglin
• Li, Tao
• Li, Guangxing

Titel

Facile synthesis of hierarchical nanocrystalline ZSM-5 zeolite under mild conditions and its catalytic performance

Ist Teil von

• Journal of colloid and interface science, 2011-09, Vol.361 (2), p.521-526

Ort / Verlag

Amsterdam: Elsevier Inc

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Hierarchical nanocrystalline ZSM-5 zeolite was prepared under mild conditions and exhibited a long lifetime and a low average coking rate in MTH reaction. [Display omitted] ► Hierarchical nanocrystalline ZSM-5 zeolite NZ5 was prepared under mild condition. ► Evaporation of solvent and addition of methylamine were vital to the preparation. ► NZ5 showed a long lifetime and a high anti-coking property in MTH reaction. 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 20nm 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. N2 adsorption-desorption isotherms showed that NZ5 had high BET surface areas with mesopores having a mean diameter of about 9nm. 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.