ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Thermal decomposition of natural mordenite

F. Pechar and D. Rykl

Institute of Geology and Geotechnics, Czechoslovak Academy of Sciences, CS-182 09 Prague

Abstract: The temperature stability of natural mordenite (Žďár by Stará Рака, Bohemia) was studied in the temperature range 20 °C—1000°C both in dynamic regime in air (DTA, TG) and in isothermal regime in vacuo. The products of decomposition were investigated by the X-ray powder method and infrared absorption spectroscopy. The scheme of the decomposition of mordenite may be written as follows mordenite→ metamordenite →  mordenite + amorphous phase →anorthite + Si0₂→  mordenite + amorphous phase + • anorthite + Si0₂ + amorphous phase Over the temperature of 510 °C, the remaining water forms the structural hydroxyl groups which persist up to the highest temperatures.

Full paper in Portable Document Format: 413a351.pdf

Chemical Papers 41 (3) 351–362 (1987)