Molecular sieves are synthetic zeolite materials engineered with pores of precise and uniform size that allow them to preferentially adsorb gases and liquids based on molecular size and polarity. They work by absorbing nitrogen from pressurized air, leaving purified oxygen that can be collected. The molecular sieves then discharge the adsorbed nitrogen back into the air when decompressed, in a cyclical process used in oxygen generators.

1. Molecular
Sieves
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2. Molecular sieves are synthetic zeolite materials engineered
with pores of precise and uniform structure and size. This
allows them to preferentially adsorb gases and liquids based
on molecular size and polarity. Zeolites are naturally
existing, highly porous crystalline solids, belonging to the
class of chemicals known as aluminosilicates.

11. 3A means that the
pore size measures as
3 angstrom. Anything
larger than 3
angstrom won’t be
able to be adsorbed.
The order of
adsorption rate is
helium, neon,
nitrogen and water.
Angstrom: a unit of
length equal to one
hundred-millionth of a
centimetre, 10−10
metre, used mainly to
express wavelengths and
interatomic distances.

14. The oxygen generator is filled with molecular sieves, which can
absorb nitrogen in the air when pressurized. And then, the
remaining unabsorbed oxygen is collected and becomes high-
purity oxygen after purification. The molecular sieve discharges
the adsorbed nitrogen back into the ambient air when it is
decompressed.

15. Database offer:
http://primaryinfo.com/projects/ze
olite-molecular-sieves.htm

16. Overview of the
manufacturing
of different
zeolite
molecular sieves
(figure compact
zeolite bodies )