Abstract

The heats of CO 2 and NH 3 adsorption on sodium, calcium, magnesium-calcium, and lanthanum-calcium forms of synthetic faujasites were studied. The Ca 2−, Mg 2+, and La 3+ cations in zeolites are preferential adsorption centers for NH 3. The substitution of Na + by Ca 2+ in zeolites leads to an increase of CO 2 adsorption heats at low coverages. With the introduction of Mg 2+ and La 3+ in calcium faujasites the heats of CO 2 adsorption decrease sharply. This suggests that most of the ions in magnesium-calcium and lanthanum-calcium zeolites do not interact directly with adsorbed molecules. All measurements of adsorption heats were made using Calvet microcalorimeters at 308 K (NH 3) and 303 K (CO 2).

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