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Gd3+-ESR spectroscopy can be used as a sensitive method for the study of lanthanide additives in catalysts. Here we present the results of a comparative study of Gd/SiO2-Al2O3 and Gd/HZSM-5. ESR gives evidence of rigid bonding of isolated Gd3+ ions into both amorphous silica-alumina and into HZSM-5. In addition, the zeolitic matrix stabilizes very small Gd3+-clusters (containing only a few ions) capable...
It is shown that the hydrothermal synthesis of aluminum-free chromosilicate results in the formation of crystalline zeolite with the ZSM-5 structure and some Cr 3+ ions substitutes isomorphically for Si 4+ ions in the lattice of as-made samples. After oxidative calcination most chromium ions aggregate in α-Cr 2 O 3 microcrystals on the outer surface of the...
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