| abstract |
-de 0,5 à 20% et de préférence de 5 à 10% en poids de molybdène, - de 0,5 à 10% et de préférence de 2,5 à 8% en poids de nickel, This catalyst comprises, on a lumine support: from 0.5 to 20% and preferably from 5 to 10% by weight of molybdenum, - from 0.5 to 10% and preferably from 2.5 to 8% by weight of nickel, n n n - 40% au plus ont une fréquence comprise entre 900 et 930 cm -1 , - 30% au moins ont une fréquence comprise entre 930 et 955 cm -1 , - 40% au plus ont une fréquence comprise entre 955 et 1020 cm -1 . The spectrum obtained by studying said catalyst by RAMAN microprobe consists of lines having, for frequencies between 900 and 1020 cm -1 , the following distribution: - 40% at most have a frequency between 900 and 930 cm -1 , - at least 30% have a frequency between 930 and 955 cm -1 , - 40% at most have a frequency between 955 and 1020 cm -1 . |