| http://www.w3.org/ns/prov#value | - Thus, for example, in the preferred case where, for example, the precursor is a catalyst of the nickel-molybdenum type supported on alumina and dealuminated Y zeolite, it is possible to impregnate this precursor with an aqueous solution of ammonium biborate and/or Rhodorsil E1P from Rhone-Poulenc, to dry, for example at 80??? C., then to impregnate with a solution of ammonium fluoride, to dry, for
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