Iron-based catalyst for direct synthesis of low-carbon olefins from synthesis gas and preparation method thereof

A technology of low-carbon olefins and catalysts, which is applied in the field of catalysts and their preparation, and can solve problems such as easy overheating, difficulty in removing heat from reactions, and low weight selectivity of low-carbon olefins

Active Publication Date: 2020-09-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by this invention is that the Fischer-Tropsch synthesis reaction exists in the prior art because the Fischer-Tropsch synthesis reaction is a strong exothermic reaction. The problem of low weight selectivity provides a new catalyst for direct synthesis of low-carbon olefins from syngas

Method used

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  • Iron-based catalyst for direct synthesis of low-carbon olefins from synthesis gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Get 40.0g titanyl sulfate and be dissolved in the water of 1000ml, be made into the titanyl sulfate solution of 0.25mol / L, this solution and the ammoniacal liquor of 400g 5% by weight co-current sedimentation and centrifugal separation, after washing three times with deionized water, fresh Titanium oxide precipitation I;

[0025] Get 606.03g of ferric nitrate nonahydrate and dissolve it in a certain amount of water to form solution II;

[0026] Mix solution II with precipitate I, and peptize in a water bath at 40°C for 24 hours to obtain colloidal slurry III;

[0027] Dissolve 0.084g of potassium hydroxide in 1.00g of water to make potassium hydroxide solution

[0028] Cool the slurry III to 10°C in a water bath at 10°C, then add the above-mentioned potassium hydroxide to the cooled slurry III, and mix and beat at 10°C;

[0029] Then add the dilute sulfuric acid of 0.098g 15% by weight in the above-mentioned slurry;

[0030] Finally, adjust the pH value of the slurry...

Embodiment 2

[0035] Get 1072g zirconium nitrate pentahydrate and be dissolved in the water of 2500ml, be made into the zirconium nitrate solution of 0.8mol / L, this solution and the ammoniacal liquor of 800g 25% by weight co-currently precipitate and centrifuge, wash with deionized water three times to obtain fresh Zirconia Precipitation I;

[0036] Get 606.03g of ferric nitrate nonahydrate and dissolve it in a certain amount of water to form solution II;

[0037] Mix solution II and precipitate I, and peptize in a water bath at 100°C for 0.5h to obtain colloidal slurry III;

[0038]Dissolve 20.47g cesium nitrate in 50.0g water to make cesium nitrate solution;

[0039] Add the above-mentioned cesium nitrate solution into the slurry III in a water bath at 100°C, and mix and beat at 100°C;

[0040] Then add 19.6g of 15% by weight dilute phosphoric acid in the above slurry;

[0041] Finally, the pH value of the slurry was adjusted to 1 with dilute nitric acid to obtain a uniform slurry IV (...

Embodiment 3

[0046] Get 80.0g titanyl sulfate and be dissolved in the water of 2000ml, be made into the titanyl sulfate solution of 0.25mol / L, centrifuge after this solution and 800g 5% by weight of ammonia water co-flow precipitation, get fresh after washing three times with deionized water Titanium oxide precipitation I;

[0047] Get 367.43g ferric citrate and dissolve in a certain amount of water to form solution II;

[0048] Mix solution II with precipitate I, and peptize in a water bath at 70°C for 12 hours to obtain colloidal slurry III;

[0049] Dissolve 4.8g sodium hydroxide in 10.00g water to make potassium hydroxide solution

[0050] Cool the slurry III to 40°C in a water bath at 40°C, then add the above-mentioned potassium hydroxide to the cooled slurry III, and mix and beat at 40°C;

[0051] Then add the dilute sulfuric acid of 0.294g 15% by weight in the above-mentioned slurry;

[0052] Finally, adjust the pH value of the slurry with dilute ammonia water to be 3 to obtain a...

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Abstract

The invention relates to an iron-based catalyst for preparing low-carbon olefin directly from synthesis gas and a preparation method for the iron-based catalyst, and mainly solves the problems in the prior art that Fischer-Tropsch synthesis reaction is strong exothermic reaction, so that when a static bed is used, heat removal is difficult and temperature runaway is easily caused in a reactor; the catalyst is easily inactivated; and the weight selectivity of the low-carbon olefin is low. The catalyst adopted in the invention comprises the following active components containing a composition with a chemical formula of Fe100AaBbOx in atomic ratio, wherein A is selected from one of Ti or Zr; and B is selected from one of alkali metals, so that the above problems are well solved. The iron-based catalyst can be applied to industrial production of preparing the low-carbon olefin directly from the synthesis gas.

Description

technical field [0001] The invention relates to a catalyst for directly preparing low-carbon olefins from synthesis gas and a preparation method thereof Background technique [0002] my country's energy is characterized by rich coal, little gas, and oil shortage, and the environmental pollution caused by direct coal combustion has also been paid more and more attention. Therefore, the development of the process of converting coal / natural gas into petroleum products through synthesis gas can not only reduce the dependence on foreign countries for energy , and it is of great significance to solve the problem of environmental pollution caused by coal burning. [0003] Synthesis gas (mainly composed of CO and H 2 ) The Fischer-Tropsch (Fascher-Tropsch) synthesis process of synthesizing hydrocarbons under the action of a catalyst is an important way for the indirect liquefaction of coal and natural gas. This method was invented by German scientists Frans Fischer and Hans Tropsch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043B01J27/185C07C11/04C07C11/06C07C11/08C07C1/04
CPCY02P20/52
Inventor 庞颖聪陶跃武宋卫林李剑锋
Owner CHINA PETROLEUM & CHEM CORP
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