Abstract
In this work, the development of a highly active noble metal phosphide (NMXPY)-based hydrodesulfurization (HDS) catalyst with a high hydrogenating ability for heavy oils was studied. NMXPY catalysts were obtained by reduction of P-added noble metals (NM-P, NM: Rh, Pd, Ru) supported on SiO2. The order of activities for the hydrogenation of biphenyl was Rh-P > NiMoS > Pd-P > Ru-P. This order was almost the same as that of the catalytic activities for the HDS of dibenzothiophene. In the HDS of 4,6-dimethyldibenzothiophene (4,6-DMDBT), the HDS activity of the Rh-P catalyst increased with increasing reaction temperature, but the maximum HDS activity for the NiMoS catalyst was observed at 270 °C. The Rh-P catalyst yielded fully hydrogenated products with high selectivity compared with the NiMoS catalyst. Furthermore, XRD analysis of the spent Rh-P catalysts revealed that the Rh2P phase possessed high sulfur tolerance and resistance to sintering.
Highlights
Hydrodesulfurization (HDS) is one of the important processes in the petroleum industry to produce clean fuels [1,2,3,4]
It is well known that hydrogenation is an important method for the desulfurization of 4,6-DMDBT, because steric hindrance led by methyl groups can be decreased by hydrogenation of aromatic rings [5,6,7]
We examined the catalytic activity of noble metals (NM)/MCM-41 for the hydrogenation of benzene at 300 ◦ C
Summary
Hydrodesulfurization (HDS) is one of the important processes in the petroleum industry to produce clean fuels [1,2,3,4]. Since fuels for ships contain larger quantities of sulfur compounds compared to gasoline and diesel fuel, regulation of sulfur oxide emissions from ships will be strict in the near future. Heavy oil contains refractory organic sulfur compounds, such as 4,6-dimethyldibenzothiophene (4,6-DMDBT). It is well known that hydrogenation is an important method for the desulfurization of 4,6-DMDBT, because steric hindrance led by methyl groups can be decreased by hydrogenation of aromatic rings [5,6,7]. The petroleum industry claims that the development of highly active hydrodesulfurization (HDS) catalysts, which exhibit higher hydrogenating and HDS activities than commercial CoMo catalysts, will prevent air pollution, acid rain, and deactivation of exhaust gas treatment catalysts. Transition metal phosphide catalysts have high potential for the HDS reaction [2,3,5,8,9,10,11,12,13,14,15]
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