Hydrocracking of Vacuum Gasoil on NiMoW/AAS-Al2O3 Trimetallic Catalysts: Effect of the W : Mo Ratio


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Abstract

The effect of the W: (W + Mo) atomic ratio in NiMoW trimetallic catalysts on their catalytic and physicochemical properties is studied. The catalysts are prepared by impregnating a carrier containing amorphous aluminosilicate (AAS) and aluminium oxide with an aqueous solution containing Ni, Mo, W compounds, and citric acid. They are studied via XRF, TEM, NH3 TPD, and low-temperature nitrogen adsorption and are tested in the hydrocracking of vacuum gasoil (VGO). The average length of a sulfide active component layer shrinks as the amount of Mo increases and the amount of W in the catalyst is reduced. XPS data indicate that the degree of sulfidation of tungsten in NiMoW trimetallic catalysts is lower than in NiW catalyst. Testing of the catalysts in hydrocracking of a straight-line VGO at 390–420°C, 16 MPa, a feedstock hourly space velocity (FHSV) of 0.71 h−1, and a H2: VGO ratio of 1200 L/L shows the activities of hydrodesulfurization, hydrodenitrogenation, hydrogenation, and hydrocracking grow along with the W: (W + Mo) ratio. When the process pressure is high and the amount of sulfur in the NiW feedstock is low, the catalysts have higher activity in the target reactions of VGO hydrocracking than NiMo catalyst.

About the authors

P. P. Dik

Boreskov Institute of Catalysis, Siberian Branch

Author for correspondence.
Email: dik@catalysis.ru
Russian Federation, Novosibirsk, 630090

V. Yu. Pereima

Boreskov Institute of Catalysis, Siberian Branch

Email: dik@catalysis.ru
Russian Federation, Novosibirsk, 630090

K. A. Nadeina

Boreskov Institute of Catalysis, Siberian Branch

Email: dik@catalysis.ru
Russian Federation, Novosibirsk, 630090

M. O. Kazakov

Boreskov Institute of Catalysis, Siberian Branch

Email: dik@catalysis.ru
Russian Federation, Novosibirsk, 630090

O. V. Klimov

Boreskov Institute of Catalysis, Siberian Branch

Email: dik@catalysis.ru
Russian Federation, Novosibirsk, 630090

E. Yu. Gerasimov

Boreskov Institute of Catalysis, Siberian Branch

Email: dik@catalysis.ru
Russian Federation, Novosibirsk, 630090

I. P. Prosvirin

Boreskov Institute of Catalysis, Siberian Branch

Email: dik@catalysis.ru
Russian Federation, Novosibirsk, 630090

A. S. Noskov

Boreskov Institute of Catalysis, Siberian Branch

Email: dik@catalysis.ru
Russian Federation, Novosibirsk, 630090

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