Method for preparing catalyst with lamella distribution

Abstract

The invention relates to a method for preparing a shell distribution catalyst, which comprises the step of using a solution containing effective quantity of active metal components to soak a carrier. The method is characterized in that a solvent in the solution is a mixture formed by one or more compositions of water, alcohol, ether, aldehyde and ketone and at least one surfactant; the content of the surfactant is between 0.01 and 10.00 weight percent in reference to the total weight of the solution; and the soaking step meets the condition that the VL / VC is equal to 0.01-0.99, wherein VL refers to the volume of the soaking solution, and VC refers to the pore volume of the carrier. The catalyst guarantees that distribution of the active metal components in the carrier reveals obvious shell distribution characteristic, and simultaneously guarantees that the active metal components are more uniformly distributed in a shell.

Description

technical field

[0001] The invention relates to a method for preparing a catalyst, more particularly to a method for preparing a non-uniformly distributed catalyst. Background technique

[0002] For a gas-solid-liquid heterogeneous reaction system such as Fischer-Tropsch synthesis in a fixed-bed reactor, the particle size of the catalyst is generally several mm, so the influence of diffusion control on the catalytic activity is unavoidable. It has been noticed that the heavy paraffin wax synthesized by FT is usually attached to the surface of the catalyst in the form of liquid, aerosol or slurry, and the reactant H 2 and the diffusion of CO inside the catalyst particles. During the internal diffusion of reactants, H 2 The diffusion rate of CO is faster than that of CO, and the diffusion limitation of CO in the catalyst particles is obviously stronger than that of H 2 . Due to the different particle sizes, the CO concentration gradient inside the particles is different, w...

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