P The invention relates to a homogeneous bed of particles of a catalyst, said catalyst comprising at least one amorphous matrix, at least one noble metal, at least one additional metal M and at least one halogen, and in which, for a catalyst particle, CPt is the local concentration of noble metal Pt, CM is the local concentration of additional metal M, Cx is the local concentration of halogen, said catalyst being in the form of a homogeneous bed of particles, in which along with a particle diameter, at least 70% of the CPt / CM or CPt / Cx values deviate by at most 30% from the average local ratio, and in which the molar ratio M / Pt within the catalyst is between 1, 8 and 6. /P
展开▼
