Design of fast crystallization of nanosized zeolite omega crystals at higher temperatures

doi:10.1016/S1872-2067(19)63280-8

Abstract

Abstract:

Fast crystallization of nanosized zeolite crystals is a very popular process used for practical zeolite catalyst applications. Herein, we report a designer crystallization process for nanosized zeolite omega crystals based on the relationship between the crystallization time and temperature in the Arrhenius equation. Compared to the conventional hydrothermal synthesis of zeolite omega (72 h at room temperature and 240 h at 100℃, MAZ-100), the crystallization of zeolite omega presented in this work only requires a very short time interval (5 h at 180℃, MAZ-180). Physicochemical characterizations, including XRD, SEM, N₂ sorption isotherms, and ²⁷Al MAS NMR show that the product of zeolite omega (MAZ-180) has good crystallinity and uniform nanocrystals. More importantly, after the loading of Pt nanoparticles (0.5 wt%), the Pt/H-MAZ-180 catalyst exhibits higher isomer selectivity and lower cracking selectivity than those of the Pt/H-MAZ-100 catalyst in the hydroisomerization of n-dodecane. These results suggest the potential applications of these omega nanocrystals as supporting catalyst compounds in industrial processes.

Key words: Zeolite omega, Fast crystallization, High temperature, Pt nanoparticles, Hydroisomerization

Fen Zhang, Ling Zhang, Zhichao Yang, Shichao Han, Qiuyan Zhu, Liang Wang, Chenguang Liu, Xiangju Meng, Feng-Shou Xiao. Design of fast crystallization of nanosized zeolite omega crystals at higher temperatures[J]. Chinese Journal of Catalysis, 2019, 40(7): 1093-1099.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63280-8

https://www.cjcatal.com/EN/Y2019/V40/I7/1093

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