Tungsten Phosphide Catalyst Desulfurization

The contradiction between the increase of organic nitrides and sulfides in oil and the heavy crude oil.

The strict environmental protection regulations are becoming more and more serious, so it is necessary to conduct deep hydrofining for oil products.

The research shows that although the traditional molybdenum sulfide based catalyst is effective in hydrotreating process, it is far from meeting the requirements of deep hydrodesulfurization. The current approach is to retrofit existing catalysts and find new catalysts that can be used to meet the need for deep hydrotreating of crude oils.

In 1990s, the synthesis and performance of tungsten nitride hydrodesulfurization catalyst have been reported abroad, and the structure and desulfurization performance of P, Ni, W catalyst with phosphorus as auxiliary agent have been studied. However, the research on tungsten phosphide seems to be few. Therefore, the Chinese scholars also try to use tungsten phosphide for hydrodesulfurization test, so as to evaluate the non phosphorus catalytic effect.

The catalyst active component tungsten phosphide was synthesized by the method of temperature programmed reduction of phosphotungstic acid with high purity hydrogen. The PW-r-Al₂O₃ catalyst was prepared by reduction and mixing with r-Al₂O₃ as the carrier and tested.

The results show that the specific surface area of the tungsten phosphide is 7.228m2/g, and the specific surface area of tungsten phosphide catalyst Al₂O₃ is 105.543m²/g, which has better thiophene desulfurization performance. When the pressure is 3.0MPa, the space velocity is 4h^-1, the volume ratio of hydrogen to oil is 1000 and the temperature is 340 °C, the thiophene hydrodesulfurization rates of the catalysts are respectively 90.2%. In addition, the stability of the catalyst was investigated. When the mixture was injected (thiophene 0.8%, pyridine 1.2%, cyclohexane 76%, octane 2%, cyclohexene 20%), the quality of the catalyst was all mass fraction, under the same reaction conditions, the denitrification rate and the desulfurization rate of the catalyst were only decreased by about 2%, which indicated that the PW-r-Al₂O₃ catalyst had good stability after 105h.

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