Figure 1: Paradox of non-polar gas molecule admission through the apparently blocked pores of a potassium chabazite. Figure 2: Atomic picture of the guest admission process through the cation-kept ...

THE ‘molecular-sieve’ properties of chabazite, a zeolite occurring in basaltic rocks, have been studied extensively. Molecules such as argon (diameter 3.84 A.) and methane (4.25 A.) are ...