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Catalyst, preparation method thereof and Fischer-Tropsch method

A catalyst and catalyst carrier technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor selectivity of Fischer-Tropsch reaction catalysts, and achieve selectivity high effect

Active Publication Date: 2012-08-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of poor selectivity of Fischer-Tropsch reaction catalysts in the prior art, and to provide a catalyst with good selectivity having an inner core-outer layer structure

Method used

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  • Catalyst, preparation method thereof and Fischer-Tropsch method
  • Catalyst, preparation method thereof and Fischer-Tropsch method
  • Catalyst, preparation method thereof and Fischer-Tropsch method

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preparation example Construction

[0017] According to the preparation method of the catalyst provided by the present invention, the method comprises using the first catalyst carrier powder and / or the first catalyst carrier precursor powder to prepare the inner core, and the second catalyst carrier powder and / or the compound loaded with the active metal component The second catalyst support precursor powder is coated on the inner core, wherein the first catalyst support powder and / or the first catalyst support precursor powder and the second catalyst support powder material and / or the second catalyst support precursor Powder is the same.

[0018] The diameter of the inner core is 1-6mm, preferably 1.5-4mm, and the amount of the second carrier catalyst powder makes the thickness of the outer layer 0.05-3mm, preferably 0.1-1.5mm. The amount of the compound of the active metal component is such that, based on the total weight of the catalyst, the content of the active metal component is 1-60%, preferably 5-50%, in...

Embodiment 1

[0031] The powders used are pseudo-boehmite (SB powder from Sasol Company). First, use a 1.5mm cylindrical orifice to extrude on a twin-screw extruder. After the extruded strips are balled into balls, measure the average The diameter is 3mm, and the SB powder that is used to form a ball is 125 grams altogether. Immerse 28 grams of unroasted pseudo-boehmite in 13 milliliters of cobalt nitrate solution with a mass concentration of 4.9 mol / L. After drying, add 1 gram of water to every 3 grams of pseudo-boehmite. Add water to the pseudo-boehmite powder of cobalt nitrate, and spray the powder into the ball forming machine. Afterwards, the sample was dried at 140° C. for 4 hours and calcined at 300° C. for 4 hours to obtain catalyst Al. The average diameter of the inner core is 3mm, and the average thickness of the outer layer is 0.10mm.

Embodiment 2

[0033] The powders used are all pseudo-boehmite (CL powder from Changling Catalyst Factory). First, use a 1.5mm cylindrical orifice plate to extrude on a twin-screw extruder. The average diameter of the ball is 3mm, and the CL powder used to form a ball is 125 grams in total. Immerse 56 grams of unroasted pseudo-boehmite in 30 milliliters of ferric nitrate solution with a mass concentration of 4 mol / L. After drying, add 1 gram of water to every 2 grams of pseudo-boehmite. Add water to the pseudo-boehmite powder of ferric nitrate, and spray the powder into the ball forming machine. Afterwards, the sample was dried at 140°C for 4 hours and calcined at 410°C for 4 hours to obtain catalyst A2. The average diameter of the inner core is 3mm, and the average thickness of the outer layer is 0.2mm.

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Abstract

The invention relates to a catalyst and a preparation method thereof. The catalyst comprises an inner core and an outer layer, wherein the inner core is of a first catalyst carrier; the outer layer is wrapped on the inner core; the outer layer comprises a second catalyst carrier and an active metal ingredient loaded on the second catalyst carrier, wherein the first catalyst carrier and the secondcatalyst carrier are made of the same material. The invention also provides a Fischer-Tropsch method. The catalyst provided in the invention has the closely-combined inner core-outer layer structure,and the inner core does not have the active metal ingredient basically, therefore, the catalyst has high selectivity, thereby being especially applicable for the Fischer-Tropsch reaction for preparing medium alkane and heavy alkane.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a Fischer-Tropsch synthesis catalyst with an inner core-outer layer structure, a preparation method thereof and a Fischer-Tropsch synthesis method. Background technique [0002] The Fischer-Tropsch synthesis reaction is a gas-solid-liquid multiphase reaction system. In a fixed-bed reactor, the particle diameter of the catalyst is generally several mm. Therefore, the influence of diffusion control on the catalytic activity is unavoidable. The heavy paraffin wax obtained by Fischer-Tropsch synthesis is usually supported on 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 . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J35/02B01J23/74C07C1/04C10G2/00B01J35/00
Inventor 孙霞侯朝鹏夏国富王倩刘斌李明丰聂红李大东石亚华胡志海
Owner CHINA PETROLEUM & CHEM CORP
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