Simple and Mixed Metal Oxides and Hydroxides: Solids with Extended Structures of Different Dimensionalities and Porosities

Fogg, Andrew M.

doi:10.1002/9780470976548.ch8

Cited by 2 publications

(1 citation statement)

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“…In other words, the alkali metal cations were adsorbed more strongly by zeolites with higher Si/Al ratio. It is reported that monovalent cations are more preferable in adsorption by high Si/Al zeolites than low Si/Al zeolites [36].…”

Section: Effect Of Ph-pm On Cec Of Zeolitesmentioning

confidence: 99%

Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of Zeolites

2015

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The saturation of negative charges of zeolites by specific cations to modify their physicochemical and catalytic properties has broadened the applications of zeolites. The adsorption behavior of H + to Li + , Na + , K + , Rb + and Cs +-saturated Linde-type A, Na-P1, mordenite, X type and Y type zeolites was evaluated at different pH-pM, where pH-pM is equal to log {(M +)/(H +)} and M + represents either Li + , Na + , K + , Rb + , or Cs +. In all cases, with decreasing pH-pM, the amounts of alkali metal retention decreased due to the adsorption of H + via cation exchange reaction. The adsorption selectivity of H + into the zeolites had a negative correlation with the Si/Al ratio of the zeolites. In each zeolite species, Cs +-saturated zeolite showed the lowest H + selectivity, and this suggested that Cs + had the strongest adsorption energy in the alkali metal cations. The adsorption of H + was strongly affected by diameter and hydration energy of the alkali metal cations, and was also affected by the framework type and Si/Al ratio of the zeolites. The adsorption of H + into zeolites decreases the amount of cation retention other than with H + and may cause the elution of Si and Al into aqueous solutions.

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Section: Effect Of Ph-pm On Cec Of Zeolitesmentioning

confidence: 99%