Stable, Porous, and bulky Particles with High External Surface and Large Pore Volume from Self-assembly of Zeolite Nanocrystals with Cationic Polymer

• Published in: Journal of physical chemistry. C Vol. 112; no. 23; pp. 8609 - 8613
• Main Authors: Song, Jiangwei, Ren, Limin, Yin, Chengyang, Ji, Yanyan, Wu, Zhifeng, Li, Jixue, Xiao, Feng-Shou
• Format: Journal Article
• Language: English
• Published: American Chemical Society 12.06.2008
• Subjects: C: Nanops and Nanostructures
• DOI: 10.1021/jp800598p
• ISSN: 1932-7447

Stable, porous, and bulky beta zeolite particles (bulky-beta) with high external surface area and large pore volume were fabricated from the self-assembly of beta nanocrystals with cationic polymers under hydrothermal condition, followed by filtration and calcination. The samples were characterized using powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N2 isotherm, and thermogravimetric analysis−differential thermal analysis. The results show that bulky-beta contains disordered mesopores, and its mesoporous walls are connected by beta nanocrystals with each other. The formation of mesoporosity in bulky-beta is proposed by the use of mesoscale organic template of cationic polymer in the synthesis. The bulky particles of bulky-beta are mechanically stable even if subject to an ultrasonic treatment for 15 min. This is very useful for the separation of zeolite particles from a slurry system via a filtration route. Very interestingly, these particles show almost the same catalytic activity and a very high yield of solid product, compared with nanocrystals of beta zeolite. This method may provide a novel route for the synthesis of catalytically active zeolites, enabling good mass transport as stable and active catalysts in potential industrial applications.