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Modification of zincophosphate sodalite with silicon

Elsevier Science & Technology
DOI: 10.1016/s0167-2991(04)80922-4


Abstract We have found that the spontaneous crystallization of zincophosphate sodalite [1,2] from the mixture of substrate solutions at low temperatures can be simplified even more and the SOD structure can be achieved only by plain grinding of the substrates in the mortar. The crystallization water, however, must be present in at least one substrate salt to make the synthesis possible. Some molecules can be encapsulated in the β-cages during the instant synthesis. Since the zincophosphate sodalite is thermally unstable, attempts have been undertaken to increase its stability by means of introducing some silicon into the structure. The syntheses were conducted both with solutions of the substrates as well as by the grinding of solid salts. The modification with sodium silicate or H2SiF6 disturbed the spontaneous crystallization and the structure SOD was attained after a much longer time. The instant syntheses still took place when limited amounts of TEOS (both in the solution as well as in the dry mixtures) were applied. The introduction of some silicone into the SOD structure does not improve the thermal stability very significantly (∼60°C). The larger amounts of silicon compounds introduced into the initial mixture were transformed mostly into amorphous silica.

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