Suspension bed hydrogenation catalyst and preparation method and application thereof

Abstract

The invention relates to a suspension bed hydrogenation catalyst and a preparation method and application thereof. The method comprises the steps that water-soluble ferrous salt is loaded on a carrier, and then a hydrogen peroxide solution is adopted for oxidation treatment to obtain the catalyst; by adopting hydrogen peroxide for oxidation treatment, compared with a traditional air oxidation method, the time required for preparing the catalyst is shortened by 90-99.5%, the activity of the prepared catalyst is also remarkably improved, the catalyst obtained by means of the method is adopted for a hydrogenation lightweight reaction of heavy coal tar in a 500ml high-pressure reactor, and the conversion rate of the heavy coal tar can reach 81% or more.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a catalyst and its preparation method and application, and further to a suspended bed hydrogenation catalyst and its preparation method and application. Background technique [0002] At present, the pyrolysis of coal is one of the important paths for coal quality utilization. Under low temperature conditions, coal pyrolysis produces gas, pyrolysis tar and semi-coke. The pyrolysis coal tar is pretreated and separated, and the light coal tar directly enters the fixed bed coal tar hydrogenation unit, and the heavy coal tar is mostly lightened by the suspension bed hydrogenation technology. For the suspended bed hydrogenation technology, the catalyst greatly affects the reaction rate, conversion rate, oil yield and hydrogen consumption of the suspended bed hydrogenation, so the development and design of a catalyst with high activity, good selectivity and low cost is very important for the s...

AI Technical Summary

Problems solved by technology

However, due to the relatively low hydrogenation activity of the iron-based catalyst itself, the hydrogenation effect is often improved by increasing the amount of catalyst added in practical applications. However, the increase in the amount of catalyst added not only leads to an increase in cost, but more importantly, it will lead to a decrease in the solid content of the material in the suspended bed. increase and increase in slag discharge

[0004] CN103877999A discloses a preparation method of a coal tar heavy oil hydrogenation catalyst, which is by adding iron sulfide and iron oxide in a relatively high proportion by weight to coal powder and mixing uniformly, according to different coal tars, respectively adding suitable concentrations of molybdenum, molybdenum, Mineral powder or metal salt solution of nickel, tungsten and cobalt, etc., add water to prepare a slurry, and carry out wet crushing of the slurry, so that the active components of molybdenum, nickel, tungsten and cobalt can be uniformly dispersed on the surface of the carrier coal powder , and at the same time realize the uniform dispersion of high weight percent iron sulfide and iron oxide active components on the surface of the coal powder carrier. The method described in this scheme has a complicated preparation process and high cost, and the prepared catalyst catalyzes heavy coal tar Low hydrogenation activity

[0005] CN102380396A discloses a bimetallic or multimetallic highly dispersed composite coal tar hydrogenation catalyst and a preparation method thereof, the catalyst comprising one or more mixtures of water-soluble salt compounds of metals from molybdenum, nickel, tungsten or cobalt Molecular-level high-activity components, nano-scale low-activity components γ-FeOOH particles and micron-scale or sub-nano-scale carrier coal powder, the active components are uniformly and highly dispersed on the surface of carrier coal powder, and the catalyst is micron-scale or sub-nanometer Grade fine powder; the preparation method described in this scheme is complicated, the preparation cost is high, and the activity of the prepared catalyst is low

This solution has the problem of high catalyst cost and difficulty in industrial application

[0007] Although the above-mentioned documents disclose some preparation methods and catalysts for preparing suspended bed hydrogenation catalysts, there are still problems such as complicated preparation process, high cost, and poor activity of the prepared catalyst. The preparation method of low suspension bed hydrogenation catalyst and high activity catalyst are still of great significance

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