Hydrogenation catalyst taking transition metal phosphide as aid

Abstract

The invention relates to a hydrogenation catalyst taking a transition metal phosphide as an aid. In the hydrogenation catalyst, a porous material is taken as a carrier, a sulfide of molybdenum and / or tungsten is taken as an active component, and the transition metal phosphide is taken as the aid. A preparation method of the catalyst comprises the following steps: introducing precursors of molybdenum and tungsten into the channel of the carrier through soluble sulfo-molybdate and / or soluble sulfo-tungstate, and heating the precursors in a protective atmosphere to obtain the sulfide of the molybdenum and / or the tungsten; and introducing transition metal hypophosphite, and thermally decomposing the transition metal hypophosphite into the phosphide in the protective atmosphere to obtain the hydrogenation catalyst taking the transition metal phosphide as the aid. The hydrogenation catalyst disclosed by the invention has high reaction activity in the hydrogen desulfurization and denitrification reactions of dibenzothiophene and nitrogen heterocyclic ring compounds, and can meet the requirements of low sulfuration and desulphurization of fuel oil.

Description

technical field [0001] The invention relates to the technical field of catalysts, more specifically, the invention relates to a hydrogenation catalyst using transition metal phosphides as auxiliary agents. Background technique [0002] In recent years, the trend of heavy and inferior crude oil has become increasingly obvious worldwide, and the content of sulfur, nitrogen and aromatics in petroleum products is increasing day by day, and the contradiction between increasingly stringent environmental protection requirements and this reality has become more and more acute. More than one-third of my country's petroleum products, especially diesel products, are produced by catalytic cracking technology. With the widespread application of heavy oil catalytic cracking technology, catalytic cracking raw materials are gradually becoming heavier and worse, making the properties of catalytic cracking diesel oil increasingly worse. , The content of sulfur, nitrogen and aromatics in diesel...

AI Technical Summary

Problems solved by technology

The transition metal phosphides disclosed in Chinese patent application 200610134020.3 are prepared by reducing metal oxides and phosphorus oxides with hydrogen at a high temperature of 600-950°C. Since the transition metal sulfides will be oxidized when they meet water, the hydrogenation reduction reaction products There is water in the medium, and the preparation of phosphides must adopt high hydrogen flow rate and low heating rate, so the preparation of transition metal phosphides takes a long time and consumes a lot of hydrogen. From the perspective of saving energy and hydrogen resources, it is difficult to realize large-scale industrialization. production; and the transition metal phosphide catalyst itself cannot meet the requirements of economically and effectively removing heteroatoms in petroleum distillates and coal tar

Images