The effect of supports (Al2O3, Al2O3-TiO2, SiO2, SiO2-TiO2 and TiO2) on hydrogenation activity of nickel and platinum catalysts has been studied. The Ni and Pt content of the samples was fixed at 5 wt.% and 0.5 wt.% respectively The deposition of TiO2 on surface of both Al2O3 and SiO2 supports increases hydrogenation activity of the catalysts. A comparison of activity of the Ni/Al2O3-TiO2 and the Ni/SiO2-TiO2 catalysts proved that the SiO2-TiO2 supports are better both for use of nickel and platinum catalysts. Pt/SiO2-TiO2 catalysts exhibited high catalytic activity in the hydrogenation of toluene at lower temperature range.
Alumina-zeolite (50 wt.% Ni,H-ZSM-5) suppored nickel catalysts (8 wt.% NiO) were investigationed for hydrocracking of hydrotreated light vacum gas oil. The influence of the methods zeolite/metal incorporation on the activity, acidity and pore distributions were examined. The experiments evidenced that, the catalyst prepared via mixing peptisates (both obtained separately) of zeolite and aluminium hydroxide displayed the highest activity and stability. For this catalyst nickel was incorporated during aluminium hydroxide peptization. When nickel was incorporated with aluminosilicate hydrogel as a peptization agent the catalyst was more rapidly deactivated.
PL
Przedstawiono wyniki badań wpływu metod preparatyki (sposób wprowadzenia zeolitu oraz niklu) na własności, aktywność oraz stabilność katalizatorów zawierających 8% mas NiO. Przedmiotem badań były katalizatory zawierające 50% mas zeolitu Ni, H-ZSM-5. Stwierdzono, że największą aktywnością i stabilnością w procesie katalitycznego odparafinowania lekkiego oleju próżniowego charakteryzuje się katalizator, w preparatyce którego zastosowano metodę polegającą na łączeniu osobno przygotowanych peptyzatów zeolitu i wodorotlenku glinowego. Nikiel wprowadzono na eapie peptyzacji wodorotlenku glinowego. Aktywność katalizatorów ulega obniżeniu przy zastosowaniu podczas preparatyki hydrożelu glinokrzemianowego.
The activity of commercial catalyst which contained 50% of ZSM-5 zeolite (in nickel form) and silica was compared with the activities of zeolite (50% of Ni, H-ZSM-5) laboratory catalysts which included aluminium oxide and nickel oxide (8 wt.%). Determinations were carried out with n-hexane (T=275 to 400 C, H2 : CH=7 : LHSV=1h-1) and a mixture of paraffin hydrocarbons (p=5.0 and 7.0 MPa, H2:CH=500 Nm3/m3, LHSV=2h-1). The experimental result show that the commercial dewaxing catalyst displayed lower hydrocracking activity than laboratory catalysts. Determinations of catalytic activity using hydrotreated light diesel oil (p=3.5 MPa, LHSV=3h-1, H2:CH=500 Nm3/m3) have revealed that the activity of the catalyst obtained on the aluminium oxide can be modified by decreasing ion exchange level in the zeolite. Hydrocracking activity of catalyst was found to decrease considerably when zeolite content was reduced from 50 to 30 wt.%.
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