3D printing assembled monolithic catalyst and preparation method thereof

Abstract

The invention discloses a 3D printing assembled monolithic catalyst and a preparation method thereof. The assembled monolithic catalyst comprises a cage type catalyst protection frame mounted on a rotor, and a monolithic catalyst is mounted on the cage type catalyst protection frame. The preparation method comprises the following steps of: designing a cage-type catalyst protection frame and a monolithic catalyst according to the structure of a reaction kettle, and performing 3D printing of the cage-type catalyst protection frame by adopting a powder bed melting technology; then mechanically stirring and mixing a catalytic active agent and a ceramic carrier material to obtain catalyst 3D printing slurry, and carrying out 3D printing of an initial monolithic catalyst blank through direct-writing forming equipment; naturally drying the initial monolithic catalyst blank, and then carrying out a high-temperature sintering process to obtain monolithic catalysts; and finally, uniformly inserting a plurality of monolithic catalysts into the cage type catalyst protection frame to assemble a monolithic catalyst structure. According to the invention, the mechanical strength of the monolithic catalyst is enhanced, the damage of the monolithic catalyst in the reaction process is reduced, and the cyclic utilization function of the monolithic catalyst is fully exerted.

Description

technical field [0001] The invention belongs to the technical field of monolithic catalysts in catalytic reactions, and in particular relates to a 3D printing assembling monolithic catalyst and a preparation method thereof. Background technique [0002] At present, the catalysts commonly used in the industry mainly include packed bed catalysts in the form of particles, supported catalysts, monolithic catalysts, etc.; the monolithic catalysts are made by mixing catalyst active components, binders, etc. in a certain proportion to form a slurry with a certain viscosity. Material, by extruding a catalyst with a specific structure, the structure is mainly a honeycomb structure with neatly arranged parallel channels, which has the advantages of high mass and heat transfer, but the traditional monolithic catalyst with a honeycomb structure has no radial mass transfer and Heat transfer, which can be unfavorable for many applications; this requires the optimization of monolithic cata...

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Problems solved by technology

[0004] At present, there are some precedents for 3D printing monolithic catalysts. The Chinese patent (CN202011013321.7, name: a method for 3D printing monolithic catalysts) precisely manufactures the required A monolithic catalyst with a complex structure and optimized performance formed by a variety of materials, which cannot be achieved by traditional manufacturing processes

But this technology has the following disadvantages: 1) the protection of the monolithic catalyst, due to the shortcomings of the monolithic catalyst, such as insufficient mechanical strength and poor impact resistance, the phenomenon of fragmentation caused by the impact of the liquid and the collision of the stirring device during the experiment Occurs from time to time; 2) The controllability of the catalytic reaction is poor, the position of the monolithic catalyst cannot be fixed in the catalytic reaction, and the scalability of the monolithic catalyst cannot be realized, etc.

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