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Determination of isotherms and initial heat of adsorption of CO2 and N2O in four A zeolites from infrared measurements

1986; Royal Society of Chemistry; Volume: 82; Issue: 2 Linguagem: Inglês

10.1039/f19868200365

2050-5655

Yves Delaval, R. Seloudoux, Évelyne Cohen de Lara,

Catalysis and Oxidation Reactions

Measurements of the v3 band area of CO2 and N2O adsorbed on KA, NaA, CaNaA and CaA zeolites at different temperatures and pressures have allowed us to obtain 'infrared isotherms' at very low coverage, from which initial heats may be deduced. A measurement of the band intensity for the two sorbates leads to the true isotherms. The advantages of this method are its high sensitivity at low coverage, the verification of the absence of water and the exclusion of chemisorption heat when it occurs, as in the case of CO2. The results have allowed us to analyse the mobility of both molecules on the four zeolites studied by using different models for the partition function.