Water vapor adsorption on SiO(2)-LiBr sol-gel materials strongly depends on bromide content. Adsorption capacities exhibited by these materials at higher relative pressures can be as high as 0.8 kg of water/kg of adsorbent. These adsorbents can be regenerated by heating at 473 K and reused. However, a gradual decay of adsorption properties occurs during repeated adsorption-desorption cycles. Thus, this family of adsorbents seems to be less attractive than the corresponding SiO(2)-CaCl(2) composites. Copyright 1999 Academic Press.