| abstract |
The invention relates to a zeolite of mazzite structural type, comprising silicon, and at least one element T chosen from the group formed by gallium and aluminum, preferably aluminum, including the number of extra-lattice T atoms. is less than 15% of the total number of T atoms present in the zeolite, the overall atomic Si / T ratio of which is between 5 and 100, as well as its preparation by extraction of T element from the zeolitic framework, preferably by dealumination of the frame, by at least one hydrothermal treatment followed by at least one acid attack. The invention relates to a catalyst comprising said zeolite at least partly in acid form, optionally at least one element chosen from the group formed by groups IB and VIII of the periodic table of elements and at least one matrix, and the use thereof of said catalyst in disproportionation of alkylaromatic hydrocarbons, and preferably disproportionation of toluene to produce benzene and xylenes, and / or in transalkylation of alkylaromatic hydrocarbons, and preferably the transalkylation of toluene and trimethylbenzenes to produce xylenes. |