Abstract
In this work, the influence of pore size distribution on water adsorption is analysed for a series of partially dehydroxylated silicas. The different pore volume of silica gels is evaluated from the analysis of nitrogen and CO2 isotherms. Some silica gels show water adsorption mainly in the first range of relative pressures (P/Po from 0-0.6), while other silica gels also show water adsorption in a second region at higher relative pressures. From the comparative analysis between the N2 and water isotherms, it can be said that only silica containing mesoporosity show water adsorption on the range of high relative pressures. On the other hand, a good correlation between the initial part of water isotherms (0-0.3) and CO2 isotherms exists (the higher the CO2 adsorption capacity, the higher the water adsorption).
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