What is the purpose of molecular sieves?

Molecular sieves are used for drying gases and liquids and for separating molecules on the basis of their sizes and shapes. When two molecules are equally small and can enter the pores, separation is based on the polarity (charge separation) of the molecule, the more polar molecule being preferentially adsorbed.

What is the major use of carbon molecular sieve?

Carbon molecular sieves (CMSs) are carbonaceous materials with a narrow pore-size distribution, i.e. effective pore diameter in the nanoscale.

What is molecular sieve catalyst?

Under the term zeolites, molecular sieves are used for a wide range of catalytic applications. They catalyze isomerisation, alkylation, and epoxidation, and are used in large scale industrial processes, including hydrocracking and fluid catalytic cracking.

What is molecular sieve material?

Molecular sieves are crystalline metal aluminosilicates having a threedimensional interconnecting network of silica and alumina tetrahedra. Natural water of hydration is removed from this network by heating to produce uniform cavities which selectively adsorb molecules of a specific size.

What is molecular sieve technology?

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.

How do you activate the molecular sieve?

They can be activated by passing hot dry gas through them. Usually the boiling point of water is sufficient if the gas is supplied very dry like distilled argon or nitrogen for most purposes and distilled neon or helium for extreme cases. A molecular sieve is a material with pores (very small holes) of uniform size.

What is a carbon molecule?

Carbon can form four covalent bonds to create an organic molecule. The simplest carbon molecule is methane (CH4), depicted here. This means that carbon atoms, bonded to other carbon atoms or other elements, form the fundamental components of many, if not most, of the molecules found uniquely in living things.

How does zeolite molecular sieve work?

Molecular sieves are synthetic zeolite materials engineered with pores of precise and uniform structure and size. A molecular sieve works by adsorbing gas or liquid molecules that are smaller than the effective diameter of its pores, while excluding those molecules that are larger than the openings.

Why is zeolite suitable for a molecular sieve?

Molecular sieves are synthetic and naturally occurring zeolites with well-defined structures that have found extensive use for the separation of permanent (or fixed) gases. Carrier gas and samples should be as dry as possible. Water is absorbed by the molecular sieve and will cause a reduction of retention times.

What is the difference between molecular sieve and silica gel?

The key difference between molecular sieve and silica gel is that a molecular sieve is a material containing pores of similar size, whereas silica gel is a substance can be used to prepare a porous material with pores of different sizes.

What is the sieving effect?

molecular sieve effect (rus. эффект, молекулярно-ситовой) — the effect that includes various availability of the inner space of porous materials for molecules different in size.