A kind of 3D printing monolithic composite structure catalyst and its preparation method and application

Abstract

The invention discloses a 3D printing monolithic composite structure catalyst as well as its preparation method and application, and belongs to the cross technical field of 3D printing and catalysts. The active component powder and carrier powder with catalytic activity are printed into a three-dimensional monolithic structure at one time, and then part of the carrier is removed by dissolving in an alkaline solution to activate the catalytic activity of the metal to obtain a monolithic composite structure catalyst. The preparation process of this method is simple, and complex structures can be customized according to the needs. The monolithic composite structure catalyst can be prepared quickly and stably, which saves materials and improves production speed. The structure is formed once, without assembly and secondary processing; The powder can be adjusted arbitrarily, with high flexibility; the activation method is simple, and it is convenient to use on site. The obtained monolithic composite structure catalyst has high structural precision, high strength and long life, and can be widely used in the fields of tail gas denitrification, synthesis gas methanation, polymer compound synthesis, oxidative dehydrogenation and hydrodesulfurization.

Description

technical field [0001] The invention belongs to the cross technical field of 3D printing and catalysts, and in particular relates to a 3D printing monolithic composite structure catalyst and its preparation method and application. Background technique [0002] Monolithic structure catalysts are mainly suitable for high-throughput and rapid reaction occasions, such as tail gas denitrification, synthesis gas methanation, polymer compound synthesis, oxidative dehydrogenation, hydrodesulfurization and other processes. Taking syngas methanation as an example, currently the most widely used methanation reactor is the fixed-bed reactor. The advantage of the fixed-bed reactor is that it is simple in design and operation, and has less wear and tear on the catalyst. However, in the actual production process, traditional granular catalysts have some obvious disadvantages: low porosity, large pressure drop in the catalyst bed, large temperature gradient at each point of the catalyst bed...

AI Technical Summary

Problems solved by technology

However, in the actual production process, the traditional granular catalyst has some obvious disadvantages: low porosity, large pressure drop of the catalyst bed, large temperature gradient at each point of the catalyst bed, serious carbon deposition of the catalyst, etc.

CN104998645A discloses a method for preparing a methanation catalyst with cordierite honeycomb ceramics as a carrier. The active component precursor is impregnated on the surface of cordierite honeycomb ceramics, and then the required catalyst is obtained by microwave roasting. However, it is subject to the manufacturing process. And technical limitations, the through holes of the ceramic carrier are straight hole channels, which further limits the effective reaction area and reaction time

The strength of the catalyst carrier prepared by these two methods is not high, which is not conducive to high-pressure reaction, and the catalyst is relatively easy to fall off.

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