cg7b01416_si_001.pdf (527.02 kB)
Recrystallization on Alkaline Treated Zeolites in the Presence of Pore-Directing Agents
journal contribution
posted on 2018-03-14, 00:00 authored by Eddy Dib, Hussein El Siblani, Shrikant M. Kunjir, Aurelie Vicente, Nicolas Nuttens, Danny Verboekend, Bert F. Sels, Christian FernandezIn
previous works aiming at understanding the mesoporous network
after alkaline treatment in the presence of organic additives, conventional
bulk characterization techniques led to the conclusion that the dissolved
zeolite does not undergo any kind of recrystallization [Verboekend, D., Cryst. Growth. Des. 2013, 13, 5025−5035]. Here for the first time, we demonstrate
using the data obtained from 1H and 129Xe NMR
spectroscopy that such recrystallization does occur, which leads to
the formation of a very thin coating of the mesopore walls. This demonstration
is done on a beta (BEA) zeolite treated in the presence of TPA+ in an alkaline solution. The formation of a small amount
of nanosized crystals or embryonic phases of silicalite-1 (MFI) zeolite
is evidenced, as well as their homogeneous dispersion on the mesoporous
surface of the beta zeolite. We think that these results may explain
why a homogeneous mesopore size distribution is obtained, when organic
pore-directing agents are used in the zeolite hierarchization process
performed in an alkaline medium.
History
Usage metrics
Categories
Keywords
129 Xe NMR spectroscopybeta zeoliteBEApresenceAlkaline Treated Zeolitesnanosized crystalspore-directing agentszeolite hierarchization processrecrystallizationmesoporous networkTPAmesopore walls1 Hmesopore size distributionformationbulk characterization techniquesmesoporous surfacePore-Directing AgentsMFI
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC