| 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-phosphorous supported on alumina-Y zeolite type, it is possible to impregnate this precursor with an aqueous solution of biborate, to dry, for example at 80??? C., then to impregnate with a solution of ammonium fluoride, to dry. for example at 80??? C., and to calcine, for example and
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