In-situ investigation of activated zeolites by diffuse-reflectance FTIR spectroscopy

Reiner Salzer

doi:10.1117/12.56286

1 March 1992 In-situ investigation of activated zeolites by diffuse-reflectance FTIR spectroscopy

Reiner Salzer

Proceedings Volume 1575, 8th Intl Conf on Fourier Transform Spectroscopy; (1992) https://doi.org/10.1117/12.56286
Event: Eighth International Conference on Fourier Transform Spectroscopy, 1991, Lubeck-Travemunde, Germany

Abstract

A new sample stage with minimal thermal expansion was used to investigate the activation process of zeolites. The results were displayed quasi-continuously by mapping the reflectance changes across the investigated spectral range. Such contour plots provide a more detailed insight into the sample behavior than individual difference spectra do. Long-term investigations were performed in the mid-infrared on glass-sealed activated samples. The solid state ion exchange between ZnO and H-ZSM-5 zeolite was studied at 450 degree(s)C. In erionites, the relation between the desorption of different ammonia species and the formation of OH groups during the activation has been studied up to 600 degree(s)C. The diffusion of water and the formation of hydroxonium ions was observed. In activated Y zeolite the intercrystalline diffusion of protons has been analyzed.

Citation Download Citation

Reiner Salzer "In-situ investigation of activated zeolites by diffuse-reflectance FTIR spectroscopy", Proc. SPIE 1575, 8th Intl Conf on Fourier Transform Spectroscopy, (1 March 1992); https://doi.org/10.1117/12.56286

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