Development of mesopore-containing CON-type zeolite with unique acidic and catalytic properties

The development of the mesoporosity of zeolite frameworks is an effective method to enhance the catalytic performance in the methanol-to-olefin reaction. Mesopore-containing CON-type boroaluminosilicate zeolite was prepared by the alkaline treatment based on the post-synthetic hydrothermal treatment...

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Bibliographic Details
Published in:Catalysis science & technology 2020-07, Vol.1 (13), p.4293-434
Main Authors: Park, Sungsik, Sato, Gakuji, Onozuka, Hiroaki, Tsutsuminai, Susumu, Koike, Masakazu, Kuroda, Kazuyuki, Gies, Hermann, Kondo, Junko N, Yokoi, Toshiyuki
Format: Article
Language:English
Subjects:
Ammonium hydroxide
Cetyltrimethylammonium bromide
Hydrothermal treatment
Methanol
NMR spectroscopy
Porosity
Properties (attributes)
Zeolites
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Summary:The development of the mesoporosity of zeolite frameworks is an effective method to enhance the catalytic performance in the methanol-to-olefin reaction. Mesopore-containing CON-type boroaluminosilicate zeolite was prepared by the alkaline treatment based on the post-synthetic hydrothermal treatment in NH 4 OH solution containing cetyltrimethylammonium bromide. The change in the concentration of NH 4 OH solution led to CON zeolites with different mesopore volumes. The effects of the NH 4 OH concentration on the structural properties of the treated samples were investigated by XRD, N 2 adsorption, SEM, TEM, and 11 B, 27 Al, and 29 Si MAS NMR analyses. In addition, in situ FTIR with pyridine and 2,4,6-trimethylpyridine as probe molecules was applied to investigate the acidic properties. In the methanol-to-olefin (MTO) reaction, the mesopore-containing CON-type zeolite showed a longer catalytic life than the parent zeolite. The enhanced catalytic properties could be attributed to the dual effects of the alkaline treatment on the porosity and acidity modification. Post-synthetic hydrothermal treatment in NH 4 OH solution containing cetyltrimethylammonium bromide.
ISSN:2044-4753
2044-4761
DOI:10.1039/d0cy00626b