Preparation method of nickel phosphide catalyst carried by composite carrier

Abstract

The invention relates to a preparation method of a nickel phosphide catalyst carried by a composite carrier. The method is characterized by comprising the following steps: firstly, using activated alumina and relative enzymes and alcohols as raw materials to prepare a composite carrier of TiO2-Al2O3 by adopting an improved sol-gel method; further, selecting suitable nickel salt and phosphate and carrying out ultrasound dipping and drying in microwaves to obtain a catalyst precursor; and finally, increasing a temperature by a program and reducing to obtain the composite support. The composite carrier of TiO2-Al2O3 prepared by the invention not only can effectively overcome the defect that nickel phosphide is apt to react with gamma-Al2O3 to generate AlP4 to lose the activity, but also overcomes the defect that a specific surface area of single TiO2 is relatively small, effectively exerts the strong metal-support interaction (SMSI) of the TiO2, thereby obtaining a hydrodesulfurization catalyst with remarkable activity efficacy.

Description

A kind of preparation method of nickel phosphide catalyst supported by composite carrier technical field The present invention relates to the preparation of an oil hydrodesulfurization catalyst, in particular to a preparation method of a nickel phosphide catalyst that changes the carrier used for carrying the active component Background technique As we all know, catalytic hydrodesulfurization (HDS) technology is still the main way to reduce the sulfur content of gasoline and diesel. The activity of traditional hydrodesulfurization catalysts has not reached the new low-sulfur content standard, so it is urgent to find efficient hydrogenation desulfurization catalyst. Studies have shown that transition metal phosphide catalysts, especially nickel phosphide, have attracted much attention due to their excellent hydrodesulfurization activity, but the specific surface area of ​​unsupported Ni2P catalysts is very small (less than 1 m2g-1), in order to improve their activity Surf...

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Problems solved by technology

However, TiO2 also has some weaknesses as a catalyst carrier. For example, its specific surface area is relatively small, generally not more than 100m2 g-1. Weak acidity makes it difficult to be widely used in industry

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