High surface area pentasil zeolite and process for making same
AssigneeUop LLC
InventorsJaime G. Moscoso, Deng-Yang Jan
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Abstract
A family of crystalline aluminosilicate zeolites has been synthesized that is a layered pentasil zeolite. These zeolites are represented by the empirical formula: Mmn+Rrp+Al1-xExSiyOz where M is an alkali, alkaline earth, or rare earth metal such as sodium or strontium, R can be a mixture of organoammonium cations and E is a framework element such as gallium, iron, boron, or indium. These zeolites are characterized by unique x-ray diffraction patterns and compositions and have catalytic properties for carrying out various hydrocarbon conversion processes.
Claims7
A pentasil-layered zeolite having a microporous crystalline structure comprising a framework of AlO2 and SiO2 tetrahedral units, and an empirical composition in the as synthesized and anhydrous basis expressed by the empirical formula of:
- Mmn+Rrp+AlSiyOz
- where M is at least one exchangeable cation selected from the group consisting of alkali and alkaline earth metals, “m” is the mole ratio of M to Al and varies from 0 to 3, R is at least one organo cation selected from the group consisting of quaternary ammonium cations, diquaternary ammonium cations, quaternary phosphonium cations, and methonium cations, “r” is the mole ratio of R to Al and has a value of about 0.1 to about 30, “n” is the weight average valence of M and has a value of about 1 to about 2, “p” is the weighted average valence of R and has a value of about 1 to about 2, “y” is the mole ratio of Si to Al and varies from greater than 32 to about 200 and “z” is the mole ratio of O to Al and has a value determined by the equation:
- z=(m·n+r·p+3+4·y)/2
- wherein the zeolite has a mesopore surface area between 140 m2/g and 400 m2/g.
Dependencies are inferred from the claim text.