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  • zeolites  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Gas phase synthesis of MTBE on fluoride-modified zeolites (1996)
    Springer
    Catalysis letters 39 (1996), S. 173-178 
    Details
    ISSN: 1572-879X
    Keywords: etherification ; H-mordenite ; HY ; HZSM-5 ; MTBE ; fluoride ; zeolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The gas phase synthesis of MTBE was studied using three series of zeolites modified by ion-exchange with ammonium fluoride, the parent materials being HY, H-mordenite, and HZSM-5. Modification of zeolites by fluoride-exchange was found to enhance the MTBE synthesis activity for all three types of zeolites without impairing their excellent selectivity to MTBE. The mechanism of activity enhancement by fluoride-modification appears to be related to the formation of extra-lattice Al rather than the presence of fluoride-ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805579
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Selectivity behavior during the equilibrium-limited high temperature formation of MTBE on acid zeolites (1994)
    Springer
    Catalysis letters 27 (1994), S. 149-157 
    Details
    ISSN: 1572-879X
    Keywords: Amberlyst-15 ; etherification ; HY ; H-ZSM-5 ; MTBE ; zeolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The synthesis of MTBE was studied in the gas phase at elevated temperatures (up to 175°C) and low pressures (150 kPa) where the MTBE formation rate is limited by thermodynamic equilibrium, using various solid acid catalysts (Amberlyst-15 resin, silica-alumina, HY and H-ZSM-5 zeolites). All the zeolites studied were found to exhibit better selectivities to MTBE than the commercially used Amberlyst-15 resin catalyst. The formation of byproducts increased with increasing temperature and appeared to have a strong enhancing effect on catalyst deactivation. H-ZSM-5 seems to be more suitable for high temperature formation of MTBE because of its excellent selectivity towards MTBE and low deactivation behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806988
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    Paper (German National Licenses)
    Fulltext
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