MCM 22

MCM 22 chemical formula |H_2.4Na_3.1| [AlO.4B_5.1Si_66.5O₁₄₄]

 

 

MCM-22 is a novel microporous molecular sieve with MWW structure. It has two independent pore systems, one of which contains a large twelve membered ring cage inside. These cages are stacked on top of the other by overlapping six membered rings, running through an approximately elliptical ten membered ring window; Another pore system is a two-dimensional sinusoidal waveform pore with an effective aperture of ten membered rings, surrounded by overlapping six membered rings connected to the supercage. The upper and lower surfaces of the layered structure of the molecular sieve are covered with high-density pore structures, with a twelve membered ring opening and a depth of approximately 0.7 nm.

 

 

Type	Indicator
Appearance	White powder
Relative crystallinity % ≥	~95
X-ray diffraction crystal phase analysis	Completely conforms to the standard XRD pattern of MCM-22, without impurities.
SiO­2/Al2O3, mol/mol	20-30
Na­2O wt % ≤	H+ 0.05	Na+
Crystallite size	Diameter 100-500 * Thickness 20-100
Dry Basewt % ≥	90
Sieve Residue wt % ≤	1
Particle Size Distribution ≥	100cm

 

 

MCM-22 has extensive applications in many catalytic fields, such as alkylation, environmental protection, gasoline upgrading, catalytic cracking, isomerization and disproportionation of aromatic compounds, isomerization of olefins, hydration, polymerization, etc. At present, it is mainly used in the production of alkyl aromatic compounds, environmental protection, and gasoline upgrading.

 

 

 

 

 

 

 

 

 

 

 

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