STUDIES ON THE TEMPERATURE PROGRAMMED DESORPTION OF WATER FROM CONAX ZEOLITES

The splitting of water in the temperature range from 470 to 970 K was studied for a series of CoNaX zeolites of a Si/Al ratio of 1.18 and of different degree of exchange and at the parent type NaX. In case of CoNaX zeolites peaks at about 570 and 670 K and a broad flat peak at even higher temperatures could be observed. Both the first peaks are ascribed to the process of dehydroxylation between CoOH and structural OH groups, the latter to the dehydroxylation between structural OH groups only. The parent type provided only a single peak with a maximum at about 570 K. From the dehydroxylation peaks activation parameters have been calculated and a scheme has been suggested for the mechanism.