Adsorption calorimetric and spectroscopic studies on isomorphous substituted (Al, Fe, In, Ti) MFI zeolites

J.J. Jänchen, G. Vorbeck, H. Stach, B. Parlitz, J.H.C. Hooff, van

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

24 Citations (Scopus)


The catalytically active sites of isomorphous substituted MFI structures have been characterized by infrared spectroscopy and microcalorimetric measurements using ammonia and acetonitrile as probe. Due to decreasing heats of NH3 adsorption, the NH3 TPD peak positions, the positions of the IR OH stretching frequencies and their shifts upon adsorption of acetonitrile the Brønsted acid site strength of the modified MFI decreases from Al>Fe> In>> silicalite. In addition to those strong sites weaker Lewis centres due to the non-framework material have been found. For TS-1 comparatively low heats of adsorption due to coordinatively bonded ammonia have been detected. The amounts of adsorption with heats higher than found for silicalite correlates with the amount of Ti in the sample.
Original languageEnglish
Title of host publicationCatalysis by microporous materials : proceedings of ZEOCAT '95, Szombathely, Hungary
EditorsH.K. Beyer, H.G. Karge, J.B. Nagy
Place of PublicationAmsterdam
ISBN (Print)0-444-82049-3
Publication statusPublished - 1995
Eventconference; ZEOCAT ; 11 (Szombathely) : 1995.07.09-13; 1995-07-09; 1995-07-13 -
Duration: 9 Jul 199513 Jul 1995

Publication series

NameStudies in Surface Science and Catalysis
ISSN (Print)0167-2991


Conferenceconference; ZEOCAT ; 11 (Szombathely) : 1995.07.09-13; 1995-07-09; 1995-07-13
OtherZEOCAT ; 11 (Szombathely) : 1995.07.09-13


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