Kasian N. Effect of the template nature on structure and sorption properties of silicate and germanate extra-large-pore zeolites

The peculiarities of the influence of series of factors (nature of template and alkali metal cations, concentration of reagents, Si/Al ratio, duration of reaction mixture ageing, conditions of hydrothermal treatment) on the formation of new high-silica zeolites IPC-1 and IPC-2 have been established. The preparation conditions of extra-large-pore zeolite IPC-3, isostructural to germanate ASU-16 with pore diameter 15 A using as template 1,6-diaminohexane have been determined. It was shown that effect of selective, determined by the peculiarities of zeolite SBU construction, incorporation of this elements into different crystallographic positions of IPC-3 framework depending on their nature, in particular on the coordination number by oxygen, occurs in Si-, Al-, Ti-containing reaction mixtures. The possibility of crystallization of extra-large-pore germanosilicate IPC-4, isostructural to ІМ-12 with pore diameter 11 A, using as structure-directing agents spiroazo compounds with different substitutes have been shown. It was established that the germanium are responsible for the formation of key secondary building unit of the structure - double 4-ring, characteristic for germanates.