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3 Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

3 Masalska A.

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Conversion of propane in the presence of oxygen over ZSM-5-based zeolite catalysts.

Masalska A.

Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

2002

Vol. 10, nr 57

259-264

The objective of the study was to investigate the transformation of propane in the presence of oxygen over ZSM-5-based zeolite catalysts. Consideration was given to the influence of the cations (V5+ Ga3+ Ni2+), oxide phases (Ga2O3, V2O5, Bi2O3, ZnO) and the presence of heteropoly acid (HPMo) on the performance of the catalysts. It was found that the conversion of propane in the presence of vanadium and gallium containing ZSM-5 zeolites exceeded that obtained with H-ZSM-5 by about 10 to 25 wt.%. Ga-containing ZSM-5 zeolites were haracterized by higher selectivities of dehydrocyclization products, and V-containing ZSM-5 zeolites displayed higher selectivities of cracking products. In the presence of the Ni-ZSM-5 zeolite, an undesirable high-yield reaction to COx was obsd. Of the catalysts contg. 5 wt.% oxide phases and H-ZSM-5, the Bi2O3/H-ZSM-5 one displays the highest propene selectivity and the ZnO/H-ZSM-5 shows the highest selectivity of dehydrocyclization products. The presence of HPMo noticeably increases the selectivity of cracking products.

The effect of catalyst composition on the hydrocracking activity.

Masalska A.

Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

1999

Vol. 9, nr 56

199-204

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.%.

Preparation and properties of Ni,H-ZSM-5 containig catalysts.

Masalska A.

Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

1999

Vol. 9, nr 56

193-198

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.

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.