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

• 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
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/d0cy00626b

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.