Adsorption of methanol, ammonia and water on the zeolite-like aluminophosphates AlPO{sub 4}-5, AlPO{sub 4}-17, and AlPO{sub 4}-18
- Russian Academy of Sciences, St. Petersburg (Russian Federation). I.V. Grebenshchikov Inst. of Silicate Chemistry
The heats of CH{sub 3}OH and NH{sub 3} adsorption on zeolite-like aluminophosphates AlPO{sub 4}-5, AlPO{sub 4}-17, and AlPO{sub 4}-18 were measured calorimetrically. The isotherms of adsorption of CH{sub 3}OH and H{sub 2}O at different temperatures were determined for the same materials. The energetics of adsorption of polar molecules shows that the electrostatic properties of zeolite-like AlPO{sub 4} are intermediate between those of zeolites and those of zeolite-like SiO{sub 2} modifications. The minima on the heat curves are observed at coverages of about 0.5--1.0 mmol/g. The behavior of heats beyond the minima is explained in terms of complexation of Al atoms with adsorbed molecules and by interactions between them. Two types of adsorption isotherms are found for AlPO{sub 4}. The presence of vertical parts on the isotherms which are shifted to high pressures with increasing temperatures corresponds to the formation of adsorption complexes with Al atoms.
- OSTI ID:
- 253735
- Journal Information:
- Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 2 Vol. 179; ISSN 0021-9797; ISSN JCISA5
- Country of Publication:
- United States
- Language:
- English
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