Modified beta zeolitic (*BEA) catalyst for isomerization of alkylated aromatics, and method for isomerization of alkylated aromatics
AssigneeSaudi Arabian Oil Company
InventorsOmer Refa Koseoglu, Robert Peter Hodgkins
Life of this patent
Estimating the term…
Abstract
The present invention relates to a catalyst for isomerization of alkylated aromatics such as mixed xylenes, using xylene isomerization catalyst particles including post-framework modified *BEA zeolite in which zirconium atoms and/or hafnium atoms, optionally in combination with titanium atoms, form a part of a framework of a beta-type zeolite.
Claims20
A process for isomerization of a hydrocarbon feed comprising ortho-xylene and/or meta-xylene comprising contacting the hydrocarbon feed with isomerization catalyst particles containing framework-modified beta-type (*BEA) zeolite in which a portion of aluminum atoms constituting a zeolite framework thereof is substituted with zirconium atoms and/or hafnium atoms, wherein the framework-modified *BEA zeolite has a crystal lattice constant of a=1.260 to 1.270 nm, b=1.260 to 1.270 nm, and c=2.620 to 2.650 nm, a specific surface area of 400 to 800 m2/g, and a molar ratio of SiO2 to Al2O3 of 10 to 70;
- and
- the framework-modified *BEA zeolite being an active catalytic material or active support material;
- wherein the ortho-xylene and/or meta-xylene are converted to para-xylene.
A process for isomerization of a hydrocarbon feed comprising ortho-xylene and/or meta-xylene into para-xylene, comprising contacting the hydrocarbon feed with isomerization catalyst particles containing framework-modified beta-type (*BEA) zeolite in which a portion of aluminum atoms constituting a zeolite framework thereof is substituted with zirconium atoms and/or hafnium atoms formed by a method comprising the steps of:
- suspending calcined *BEA zeolite in water to form a suspension;
- adding an acid, and a zirconium compound and/or a hafnium compound, to form a mixed solution;
- neutralizing the mixed solution;
- and
- obtaining the framework-modified beta-type (*BEA) zeolite by filtering and drying;
- wherein the framework-modified *BEA zeolite has a crystal lattice constant of a=1.260 to 1.270 nm, b=1.260 to 1.270 nm, and c=2.620 to 2.650 nm, a specific surface area of 400 to 800 m2/g, and a molar ratio of SiO2 to Al2O3 of 10 to 70;
- and
- the framework-modified *BEA zeolite being an active catalytic material or active support material.
Dependencies are inferred from the claim text.