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As has been proven earlier, ruthenium-containing NaHY zeolites are able to catalyze the decomposition of ammonia at temperatures from 300 to 450°C. In such catalysts, ruthenium cations are still present, even after heat treatment in high vacuum at 400°C; they can be detected using ammonia and/or pyridine as probes for Fourier transform IR spectroscopy. They reside both in supercages and in sodalite...
Framework and nonframework gallium species in beta zeolites were characterized by n.m.r., XPS, and i.r. spectroscopic methods. The isomorphous substitution of Al +3 by Ga +3 in the framework of beta zeolite gives 1 and 3 ppm downfield shifts of Si(1M) and Si(2M) peaks (M = Ga instead of Al) in 29 Si MAS n.m.r. spectra, such shifts have been confirmed by SCF-GIAO theoretical...
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