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MCM-22 was first synthesized and patented in 1990 by researchers from Mobil Oil Corporation and the Structure Commission of the International Zeolite Association (IZA) designated this peculiar topology as MWW (Mobil Twenty Two). This zeolite crystallizes as a lamellar precursor which condenses to a full three-dimensional structure under calcination, with crystals having hexagonal morphology and axis c- unit cell perpendicular to the surface.
MCM-22 structure consists of two independent pore systems: one of these systems consists of two-dimensional sinusoidal channels defined by 10-membered rings, whose internal diameter is 4.0 x 5.9 Å, similar to those found in zeolite ZSM-5; and the other channel system is formed by stacking supercages of 7.1 x 7.1 x 18.2 Å, accessible through 10 member rings. This peculiar porous systems allowed an efficient distribution of the acid sites on the external surface as in the zeolite cavities.
The zeolite MCM-22 is widely used in various catalytic reactions such as disproportionation of toluene, aromatization of methane, alkylation of benzene, alkane cracking reactions, methanol-to-olefin conversion, and also as an additive in FCC catalysts due to its acidity, which is not restricted to acid sites inside the porous systems, but also presents acid sites located in the semi cavities (‘‘cups’’) on the outer surface of the crystallites.
Product | Series Code | Framework | SiO2/Al2O3 (mol/mol) | Pore Diameter Å | Crystal Size μm | Cation | BET mm2/g | L.O.I 1000℃,% | Na2O % | Partcicle Size μm(D50) |
MCM-22 | YT-Z-22 | MWW | 20~35 | 4.0X5.9 | _ | H+ | >600 | <10 | - | 5-10 |
Application: | |
- Alkylation of Aromatic Hydrocarbon (Benzene, etc) - Disproportionation of Toluene - Aromatization of Methane - Alkane Cracking | - Transalkylation of Polyalkylbenzene - Absorbent - MTO - FCC |
MCM-22 was first synthesized and patented in 1990 by researchers from Mobil Oil Corporation and the Structure Commission of the International Zeolite Association (IZA) designated this peculiar topology as MWW (Mobil Twenty Two). This zeolite crystallizes as a lamellar precursor which condenses to a full three-dimensional structure under calcination, with crystals having hexagonal morphology and axis c- unit cell perpendicular to the surface.
MCM-22 structure consists of two independent pore systems: one of these systems consists of two-dimensional sinusoidal channels defined by 10-membered rings, whose internal diameter is 4.0 x 5.9 Å, similar to those found in zeolite ZSM-5; and the other channel system is formed by stacking supercages of 7.1 x 7.1 x 18.2 Å, accessible through 10 member rings. This peculiar porous systems allowed an efficient distribution of the acid sites on the external surface as in the zeolite cavities.
The zeolite MCM-22 is widely used in various catalytic reactions such as disproportionation of toluene, aromatization of methane, alkylation of benzene, alkane cracking reactions, methanol-to-olefin conversion, and also as an additive in FCC catalysts due to its acidity, which is not restricted to acid sites inside the porous systems, but also presents acid sites located in the semi cavities (‘‘cups’’) on the outer surface of the crystallites.
Product | Series Code | Framework | SiO2/Al2O3 (mol/mol) | Pore Diameter Å | Crystal Size μm | Cation | BET mm2/g | L.O.I 1000℃,% | Na2O % | Partcicle Size μm(D50) |
MCM-22 | YT-Z-22 | MWW | 20~35 | 4.0X5.9 | _ | H+ | >600 | <10 | - | 5-10 |
Application: | |
- Alkylation of Aromatic Hydrocarbon (Benzene, etc) - Disproportionation of Toluene - Aromatization of Methane - Alkane Cracking | - Transalkylation of Polyalkylbenzene - Absorbent - MTO - FCC |
7.1x7.1x18.2