In Situ Synchrotron‐Based IR Microspectroscopy To Study Catalytic Reactions in Zeolite Crystals

Diffusion in Zeolites – Impact on Catalysis

“…Several techniques like AFM, optical and fluorescence microscopy, electron backscatter diffraction/focused ion beam, FTIR, and Raman have been applied (see Chapter 8 for more details). In addition, the catalytic behavior of such crystals have been studied by spatial and time-resolved techniques that complement the structural studies and demonstrate the nonuniform catalytic behavior of such zeolitic crystals [28,[80][81][82][83][84][85]. These studies indicate a trend that the larger the zeolite crystal, the less perfect its pore structure.…”

Space-Resolved Profiling Relevant in Heterogeneous Catalysis

“…impregnation and drying processes of Ni/ c-Al 2 O 3 catalyst bodies were investigated by IRM combined with UV-Vis spectroscopy, giving insight into the influence of chelating ligands of precursor complexes on the distribution of the active metal sites over the bodies [23]. Recently, the first in situ, space-and time-resolved IRM study of styrene oligomerization within the H-ZSM-5 micropores was demonstrated using a highly brilliant synchrotron IR beam and the non-uniform product distribution within the crystal was rationalized [24].…”

Zeolithkristalle: Morphologie und Katalyse

“…[15] Bezüglich der räumlichen Auflösung ist die IR-Mikroskopie der OM wellenlängenbedingt zwar unterlegen (typischerweise 20 20 mm 2 ), doch weil Synchrotronstrahlung um 100-bis 1000-mal intensiver ist als Strahlung aus üblichen IR-Lichtquellen, wird eine räumliche Auflösung nahe der Beugungsgrenze erzielt (gewöhnlich unter 5 [17][18][19] Alles in allem sieht die Zeolithforschung einer prächtigen Zukunft entgegen.…”