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Method for preparing catalyst with lamella distribution

A catalyst and shell technology, applied in the field of non-uniformly distributed catalyst preparation, can solve the problems of influence, reduced carbon chain growth probability, reduced selectivity, etc., and achieves the effects of simple operation, uniform distribution, and improved performance

Active Publication Date: 2009-06-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different particle sizes, the CO concentration gradient inside the particles is different, which affects the combination of CO and the metal active center, which increases the H / C ratio adsorbed on the active center, reduces the probability of carbon chain growth, and reduces the C 5+ selectivity

Method used

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  • Method for preparing catalyst with lamella distribution
  • Method for preparing catalyst with lamella distribution
  • Method for preparing catalyst with lamella distribution

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preparation example Construction

[0014] Taking the preparation of the cobalt-based Fischer-Tropsch synthesis catalyst with uniform shell distribution as an example, the preferred preparation method of the present invention comprises:

[0015] (1) Prepare a mixed solvent consisting of one or more selected from water, alcohol, ether, aldehyde, ketone and at least one surfactant, and mix an effective amount of cobalt-containing compound with the solvent to form a solution;

[0016] (2) impregnate the carrier with the solution described in step (1), and the impregnation satisfies: V L / V C =0.01~0.99, among them, V L is the volume of immersion solution, V C is the pore volume of the carrier;

[0017] (3) The impregnated product in step (2) is dried, calcined or not calcined to obtain a catalyst.

[0018] The cobalt-containing compound is any compound soluble in the solvent except cobalt sulfide, for example, one or more selected from cobalt nitrate, cobalt acetate, cobalt carbonyl and the like.

[0019] The ...

Embodiment 8-9

[0037] This example illustrates the performance of the catalyst provided by the method of the invention

[0038] Catalysts G and H were evaluated in a fixed-bed Fischer-Tropsch synthesis reactor, with a catalyst dosage of 5 grams and a catalyst particle size of 2-4 mm.

[0039] The catalyst is reduced before use. The reduction was carried out under normal pressure, and other conditions were as follows: the hydrogen flow rate was 1000 Nl / g-cat / h, the temperature was raised to 400° C. at a heating rate of 4° C. / min, and kept for 5 hours.

[0040] The Fischer-Tropsch synthesis reaction temperature is 210 °C, H 2 The / CO ratio is 2, the pressure is 2.5MPa, and the gas hourly space velocity (GHSV) is 2000h -1 . The results are listed in Table 2.

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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...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J27/25
Inventor 孙霞侯朝鹏夏国富王倩刘斌李明丰聂红李大东石亚华
Owner CHINA PETROLEUM & CHEM CORP
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