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A kind of preparation method of cobalt-based Fischer-Tropsch catalyst using glycerol carbonate as dispersant

A catalyst and cobalt-based Fischer-Tropsch technology, which is applied in the field of preparation of cobalt-based Fischer-Tropsch catalysts, can solve the problems of cobalt tetroxide grain growth, difficult removal of coke and other substances, and reduction of catalyst dispersion.

Active Publication Date: 2017-03-08
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, polyhydric alcohols, carboxylic acids, sugars and other substances will undergo polycondensation reactions during the thermal decomposition process, and the generated coke and other substances are not easy to remove. It is necessary to increase the roasting temperature to remove them, and the excessively high roasting temperature is very easy to cause the crystal grains of cobalt tetroxide to grow. Large, thereby reducing the dispersion of Co in the catalyst

Method used

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  • A kind of preparation method of cobalt-based Fischer-Tropsch catalyst using glycerol carbonate as dispersant
  • A kind of preparation method of cobalt-based Fischer-Tropsch catalyst using glycerol carbonate as dispersant
  • A kind of preparation method of cobalt-based Fischer-Tropsch catalyst using glycerol carbonate as dispersant

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preparation example Construction

[0028] In the preparation method of cobalt-based Fischer-Tropsch catalyst of the present invention, Al 2 o 3 、TiO 2 and / or SiO 2 Porous supports can be prepared by precipitation, kneading or sol-gel methods, or commercially available Al 2 o 3 、TiO 2 and / or SiO 2porous carrier. As exemplary, but not limiting, the above-mentioned Al 2 o 3 、TiO 2 and / or SiO 2 Examples of porous support preparation methods are as follows:

[0029] A: Preparation of Al by precipitation method 2 o 3 Porous carrier:

[0030] (1) First, a certain concentration of Al(NO 3 ) 3 aqueous solution;

[0031] (2) Then, to Al(NO 3 ) 3 Slowly add ammonia water (precipitant) to the aqueous solution until the precipitation is complete, or Al(NO 3 ) 3 The aqueous solution and ammonia water are fed into the precipitation tank in parallel, and the pH value is kept between 5-10;

[0032] (3) Next, the solution that produces the precipitate is left to age for half an hour, then washed and filtered...

Embodiment 1

[0066] Embodiment 1: Preparation chemical composition is 10Co / 0.017Pt / 100SiO 2 catalyst

[0067] (1) Preparation of SiO by sol-gel method 2 porous carrier

[0068] First, add deionized water, tetraethyl orthosilicate and absolute ethanol to the container in sequence, while stirring, and react in a water bath at 85°C for 6 hours to form a silicon-containing sol; then, put the sol into a drying oven Dry at 80°C for 6 hours to form a silicon-containing xerogel; then bake the xerogel at 650°C for 9 hours to obtain SiO 2 Porous carrier, the specific surface area of ​​the porous carrier is 200m 2 / g, the pore volume is 0.8mL / g.

[0069] (2) Preparation of catalyst by impregnation method

[0070] Dissolve 49.5 grams of cobalt nitrate hexahydrate and 0.034 grams of tetraammine platinum nitrate in 85 milliliters of deionized water to make a cobalt nitrate impregnation solution, then add 2.5 grams of glycerol carbonate as a dispersant in the cobalt nitrate impregnation solution, an...

Embodiment 2

[0076] Embodiment 2: Preparation chemical composition is 20Co / 0.034Pd / 100SiO 2 catalyst

[0077] (1) Preparation of SiO by sol-gel method 2 porous carrier

[0078] First, add deionized water, tetraethyl orthosilicate and absolute ethanol to the container in sequence, while stirring, and react in a water bath at 80°C for 5 hours to form a silicon-containing sol; then, put the sol into a drying oven Dry at 80°C for 6 hours to form a silicon-containing xerogel; then bake the xerogel at 550°C for 10 hours to obtain SiO 2 Porous carrier, the specific surface area of ​​the porous carrier is 250m 2 / g, the pore volume is 1.3mL / g.

[0079] (2) Preparation of catalyst by impregnation method

[0080] Dissolve 99 grams of cobalt nitrate hexahydrate and 0.074 palladium nitrate in 241 milliliters of deionized water to make a cobalt nitrate impregnating solution, then add 9.9 grams of glycerol carbonate as a dispersant in the cobalt nitrate impregnating solution, and weigh 100 grams of...

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Abstract

The invention discloses a method for preparing a cobalt-based Fischer-Tropsch catalyst by glycerol carbonate as a dispersant. The catalyst comprises, by weight, 10-30 parts of Co, 0.01-0.1 parts of Pt, Ru, Pd, Rh, Re and / or Ir or oxides thereof, and 100 parts of Al2O3, TiO2 and / or SiO2 carrier. Preferably, the catalyst comprises, by weight, 15-25 parts of Co, 0.02-0.06 parts of Pt, Ru, Pd, Rh, Re and / or Ir or oxides thereof, and 100 parts of Al2O3, TiO2 and / or SiO2 carrier. The method of the catalyst comprises the following steps of adding a certain amount of glycerol carbonate as a dispersant into a precursor impregnation liquid, a coprecipitation solution or a deposition-precipitation solution so that dispersion of the Co component in the carrier is promoted. The cobalt-based Fischer-Tropsch catalyst has the advantages of good Co component dispersity, small Co3O4 crystal grain size and good catalytic performance.

Description

technical field [0001] The invention relates to a preparation method of a cobalt-based Fischer-Tropsch catalyst, in particular to a preparation method of a cobalt-based Fischer-Tropsch catalyst using glycerol carbonate as a dispersant. Background technique [0002] The Fischer-Tropsch synthesis reaction refers to the synthesis gas (H 2 +CO) is converted into hydrocarbons and other chemicals under the action of a catalyst at a certain temperature and pressure. In recent years, due to the increasing shortage of petroleum resources and the continuous rise of crude oil prices, Fischer-Tropsch synthesis has attracted extensive attention from researchers all over the world. Generally, the reaction of Fischer-Tropsch synthesis to generate hydrocarbons can be represented by the following reaction formula: [0003] mCO+(2m+1)H 2 →C m h 2m+2 +mH 2 O (1) [0004] mCO+2mH 2 →C m h 2m +mH 2 O (2) [0005] 2mCO+(m+1)H 2 →C m h 2m+2 +mCO 2 (3) [0006] In the Fischer-Trop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J23/889C10G2/00C10L3/08C07C1/04C07C9/04
Inventor 李加波林泉石玉林胡云剑吕毅军罗熙
Owner CHNA ENERGY INVESTMENT CORP LTD