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•Tetralin as an H-donor promotes the reactivity of asphaltenes.•Tetralin reduces coke and gas formation in hydrocracking of pitch.•Dispersed MoS2 catalyst coupled with H-donor ...improves pitch HCK performance.
The effects of tetralin as an H-donor on the reactivity of asphaltenes in a petroleum pitch were investigated under thermal cracking or catalytic hydrocracking conditions at 693 K and 10.0 MPa N2 or H2. Reaction temperatures, pressures, and tetralin contents were varied to examine the reactivity of asphaltenes. Thermal cracking of the petroleum pitch led to a considerable amount of coke formation, close to 53.7 wt%, but the addition of tetralin reduced the coke formation down to 23.6 wt%. The coke formation was considerably reduced to 10.3 wt% in the catalytic hydrocracking condition, and was not formed in the presence of tetralin. Kinetic studies on the catalytic hydrocracking of petroleum pitch in the absence or presence of tetralin demonstrated that the addition of tetralin, showing an increase in the hydrogen transfer capacity, contribute to the marked performance of hydrocracking of the petroleum pitch in the presence of dispersed MoS2 catalyst.
In order to design a suitable catalyst for hydrocracking (HCK) of vacuum residue (VR), a series of NiMoS/γ-Al2O3 catalysts were prepared with varying Mo loading amounts, Ni addition, P addition, and ...porosity of γ-Al2O3 support, and were applied for the VR HCK. Activity tests were conducted in an autoclave batch reactor at 693 K and 10 MPa H2 for the VR HCK in the presence of 0.26 wt% catalyst and 33.0 wt% tetralin. X-ray absorption spectroscopy (XAS), N2-physisorption, H2-temperature programmed reduction (H2-TPR), and energy dispersive X-ray fluorescence (ED-XRF) measurements were applied to verify the physical properties of the prepared catalysts. The amount of Mo loadings on γ-Al2O3 was observed most favorable at 8.0 wt% with the asphaltene conversion of 62.9%. The addition of Ni had minimal effect on the VR HCK, but the effect on the hydrodesulfurization (HDS) of VR was significant. It was noteworthy that the increase in porosity of the γ-Al2O3 support played an important role in enhancing the asphaltene conversion to 68.5%.
In order to design a suitable catalyst for hydrocracking (HCK) of vacuum residue (VR), a series of NiMoS/γ-Al2O3 catalysts were prepared with varying Mo loading amounts, Ni addition, P addition, and ...porosity of γ-Al2O3 support, and were applied for the VR HCK. Activity tests were conducted in an autoclave batch reactor at 693 K and 10 MPa H2 for the VR HCK in the presence of 0.26 wt% catalyst and 33.0 wt% tetralin. X-ray absorption spectroscopy (XAS), N2-physisorption, H2-temperature programmed reduction (H2-TPR), and energy dispersive X-ray fluorescence (ED-XRF) measurements were applied to verify the physical properties of the prepared catalysts. The amount of Mo loadings on γ-Al2O3 was observed most favorable at 8.0 wt% with the asphaltene conversion of 62.9%. The addition of Ni had minimal effect on the VR HCK, but the effect on the hydrodesulfurization (HDS) of VR was significant. It was noteworthy that the increase in porosity of the γ-Al2O3 support played an important role in enhancing the asphaltene conversion to 68.5%.
