| abstract |
The invention relates to a catalyst comprising a matrix, an MFI-type zeolite and at least one element of group VIII, in which the crystals of the MFI-type zeolite are dealuminated on their external surface by at least one treatment with at least one solution. of a fluorosilicate of a cation chosen from the group formed by NH4 <+>, ammonium alkyls, K <+>, Na <+>, Li <+>, Ba² <+>, Mg² <+>, Cd² < +>, Cu <+>, Cu² <+> Ca² <+>, Cs <+>, Fe² <+>, Co² <+>, Pb² <+>, Mn² <+>, Rb <+>, Ag <+ >, Sr² <+>, Zn² <+>, Tl <+> and H <+>, the overall dealumination rate of said MFI zeolite thus treated being less than 5 atomic%. |