Situ Microspectroscopy of H-ZSM-5 Molecular Sieves

Large coffin-shaped zeolite H-ZSM-5 crystals have been chosen as suitable model systems to study the structural motifs and related intergrowth structure, which are also present in smaller powdered zeolite materials used in industrial catalysis. The advantage of large model crystals, which can be prepared with adjustable Si/Al ratio and size, is that the catalytic properties of each growth unit of a zeolite can be studied separately by means of optical microscopy methods, such as UV-vis microspectroscopy and confocal fluorescence microscopy [114, 122]. As both microspectroscopy methods obey the optical Abbe diffraction limit, features can be studied in the size of approximately X/2. The resolution d of an optical microscope is given by 

Mores et ol. [114] first reported a time and spatially resolved in situ study on the MTH reaction over H-ZSM-5 and H-SAPO-34 using a high-temperature 

By means of confocal fluorescence microscopy, the spatial distribution of reactivity throughout the zeohte H-ZSM-5 crystals could be determined. On the 

In Situ Nuclear Magnetic Resonance of H-SAPO-34 and H-ZSM-5 Molecular Sieves 

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