THE chromatographic separation of argon and oxygen is difficult, and existing methods depend on one of the following techniques: (1) Separation on a molecular sieve 5 Å column at 18° C (ref.

Molecular Sieves The zeolite minerals, whose crystals contain a myriad of minute pores, have made possible a new branch of chemical technology. They can perform precise separations of very similar ...

MOFs have stable structures with accessible pores and large surface areas, so they show great promise as molecular sieves and sponges for small organic molecules or gases. To date, most MOFs have ...