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Iron-based catalyst for preparing low-carbon olefin directly from synthesis gas and preparation method of iron-based catalyst

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

Active Publication Date: 2017-05-03
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 preparing low-carbon olefin directly from synthesis gas and preparation method of iron-based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Get 40.0g of titanyl sulfate and dissolve it in 1000ml of water, make it into 0.25mol / L titanyl sulfate solution, the solution and 400g of 5 wt% ammonia water are co-precipitated and then centrifuged, washed with deionized water three times to obtain fresh The titanium oxide precipitate I;

[0025] Dissolve 606.03 g of ferric nitrate nonahydrate in a certain amount of water to prepare solution II;

[0026] Mix solution II and 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 0.098g of 15% by weight dilute sulfuric acid to the above slurry;

[0030] Finally, the pH value of the slurry was adjusted to 5 with ammonia water to obtain a uniform ...

Embodiment 2

[0035] Take 1072g of zirconium nitrate pentahydrate and dissolve it in 2500ml of water, make it into a 0.8mol / L zirconium nitrate solution, and the solution and 800g of 25% by weight ammonia water are co-precipitated and then centrifuged, and washed three times with deionized water to obtain fresh Zirconia Precipitation I;

[0036] Dissolve 606.03 g of ferric nitrate nonahydrate in a certain amount of water to prepare solution II;

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

[0038]Dissolve 20.47g of cesium nitrate in 50.0g of water to prepare a cesium nitrate solution;

[0039] Add the above cesium nitrate solution to 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 to 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 (solid conten...

Embodiment 3

[0046] Get 80.0g of titanyl sulfate and dissolve it in 2000ml of water, make it into a 0.25mol / L titanyl sulfate solution, and this solution and 800g of 5 wt% ammonia water are co-precipitated and then centrifuged, and washed three times with deionized water to obtain fresh The titanium oxide precipitate I;

[0047] Dissolve 367.43g of ferric citrate in a certain amount of water to prepare solution II;

[0048] Mix solution II and 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 of 40 °C, then add the above-mentioned potassium hydroxide to the cooled slurry III, and mix and beat at 40 °C;

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

[0052] Finally, the pH value of the slurry was adjusted to 3 with dilute ammonia water to obtain a uniform slurr...

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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] The characteristics of my country's energy are that it is rich in coal, lacks gas and lacks oil, and the environmental pollution caused by the direct combustion of coal has also been paid more and more attention. Therefore, the development of the process of converting coal / natural gas through synthesis gas into petroleum products can not only reduce energy dependence on foreign countries , and it is of great significance to solve the problem of environmental pollution caused by coal combustion. [0003] Utilize syngas (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 of indirect liquefaction of coal and natural gas. This method was invented by German scientists Frans Fischer an...

Claims

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Application Information

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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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