The influence of pre-adsorbed water on adsorption of methane on fumed and nanoporous silicas

► Methane adsorption is maximal at 10% hydration of nanosilica. ► Methane adsorption leads to appearance of weakly associated water (WAW). ► Amounts of WAW correlate to concentration of adsorbed methane. ► Methane adsorption on micro/mesoporous silica 200DF decreases with hydration.