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- W2037271752 abstract "Structured zeolite/silicon carbide composites were succesfully synthesized by ZSM-5 coatings deposited on macroscopic β-SiC foams with medium surface area. A homogeneous coverage of the support (30 wt % zeolite) by ZSM-5 crystals, having 1 μm average size, was reached after a double-coating procedure. The ZSM-5/β-SiC composite materials were characterized by BET, XRD, SEM, and H/D exchange methods. 27Al MAS NMR analysis revealed that all aluminum was present in a tetrahedral coordination, thus sitting in the zeolite framework. The existence of a nanoscopic layer of silica and silicon oxycarbide on the surface of the support ensures the strong anchoring of the zeolite crystals on the β-SiC substrate. The lack of secondary chemical reaction between the synthesis solution and the support allows a precise control of the Si/Al ratio in the final zeolite. The use of ZSM-5 coated β-SiC foam packings in the methanol-to-olefins reaction presents substantial activity/selectivity improvements compared to conventional zeolite packings. Moreover, the structured composites exhibit a higher stability toward deactivation by coking, compared to the powdered form of the zeolite." @default.
- W2037271752 created "2016-06-24" @default.
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- W2037271752 date "2007-03-01" @default.
- W2037271752 modified "2023-10-14" @default.
- W2037271752 title "ZSM-5 Coatings on β-SiC Monoliths: Possible New Structured Catalyst for the Methanol-to-Olefins Process" @default.
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- W2037271752 doi "https://doi.org/10.1021/jp067535k" @default.
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