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  • 1 Institute of Silicate Chemistry of the USSR Acad. Sci. NAB. Makarova, 2 199164 Leningrad USSR
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The heats of adsorption of CO2 and NH3 were studied for sodium, lithium, calcium and decationized forms of natural mordenites. The exchange of Na+ for Ca2+ leads to increasing adsorption heats at low coverages. For CO2 the region of elevated heats corresponds to the formation of Ca2+ ... CO2 adsorption complexes. Two molecules of NH3 probably interact with each Ca2+ ion (or with the Li+ ions in Li-mordenite). The heats of adsorption of NH3 on decationized mordenite are much higher than those on calcium mordenite.