Which mechanism limits the effectiveness of molecular sieve adsorbents in separating hydrocarbon isomers?

💡 Explanation

When separating isomers using molecular sieves, kinetic diameter exclusion occurs because the pore size is carefully selected to only allow the smaller isomer to enter and be adsorbed. Therefore, sieving is limited precisely by diameter differences, rather than polarizability or macroscopic behavior, which offer less fine separations.

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