Structural and catalytic characterization of nanosized mesoporous aluminosilicates synthesized via a novel two-step route

✍ Scribed by Shang-Ru Zhai; Il Kim; Chang-Sik Ha

• Book ID: 104009727
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 550 KB
• Volume: 131
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.10.018

✦ Synopsis

Nanosized Al-containing mesostructures with a narrow grain size distribution and high aluminum content (Si/Al ! 5) have been facilely prepared via a novel two-step synthetic process, in which the pre-hydrolysis and afterward fast-assembly of inorganic species can be conveniently promoted by acidic aluminum salt and basic catalyst, respectively. Meanwhile, nonionic polyethylene glycol (PEG-4000) added in the synthesis can effectively regulate the grain size and distribution through hydrogen-bonding blocking. Along with high density of acidic sites, the interesting morphology consisted of slight aggregation of nanoparticles with AlMCM-41 structure and thereby formation of a second broader porous system in these interparticle voids may be responsible for its superior activity in the bulky hydrocarbon cracking reactions; i.e. not only good catalytic behavior to the transformation of 1,3,5-triisopropylbenzene even at the lowest temperature tested but also stable cumene conversion can be achieved over the nanoscale mesoporous aluminosilicates. These results reveal that our nanosized mesoporous aluminosilicates are a capable catalyst of high connectivity and accessibility particularly for large molecules.