Abstract
The factors influencing stability, acidity and catalytic activity of germanosilicate UTL zeolites have been systematically investigated. Three different strategies of bifunctional catalyst preparation were explored. Both X-ray diffraction and 29Si MAS NMR were performed to study structure transformation/degradation of the catalysts. Our results show classical methods of catalysts preparation are not suitable for germanosilicate zeolites which possess low hydrolytic stability and are sensitive to humidity. The present work provides an optimized strategy of catalyst preparation starting from uncalcined UTL zeolite. This method allows to obtain a catalyst stable even after three runs of testing in the n-decane hydroisomerization/hydrocracking reaction.
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