Patent ID: 6130363
Filing Date: 2000-10-10
Classification: B01J,C07C,C10G

Abstract:
A process for the isomerization of a C.sub.8 -aromatic cut, comprising subjecting said cut to effective conditions in the presence of a catalyst comprising a matrix, an MFI zeolite and at least one group VIII element, wherein crystals of the MFI zeolite are dealuminated on outer surfaces at least 37% by at least one treatment with at least one solution of a fluorosilicate having a cation which is NH.sub.4.sup.+, an alkylammonium, K.sup.+, Na.sup.+, Li.sup.+, Ba.sup.2+, Mg.sup.2+, Cd.sup.2+, Cu.sup.+, Cu.sup.2+, Ca.sup.2+, Cs.sup.+, Fe.sup.2+, Co.sup.2+, Pb.sup.2+, Mn.sup.2+, Rb.sup.+, Ag.sup.+, Sr.sup.2+, Zn.sup.2+, Tl.sup.+, or H.sup.+, the overall dealumination of said zeolite thus treated being less than 5 percent on an atomic basis, the atomic Si/Al ratio of the MFI zeolite prior to treatment with fluorosilicate being at least 5 and less than 100.