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Catalyst for synthesis of low carbon olefins and its preparation method

A low-carbon olefin and catalyst technology, applied in the field of iron-based catalysts and their preparation, can solve the problems of easy overheating, difficult overheating, and easy deactivation of catalysts

Active Publication Date: 2014-07-23
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. For the problem of low weight selectivity, a new iron-based catalyst for Fischer-Tropsch synthesis of low-carbon olefins is provided. When the catalyst is used for the reaction of Fischer-Tropsch synthesis of low-carbon olefins, it has the advantages of fast reaction heat removal, low temperature and low-carbon olefin weight. The advantage of high selectivity

Method used

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  • Catalyst for synthesis of low carbon olefins and its preparation method

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Embodiment 1

[0021] Get 606.03g of ferric nitrate nonahydrate and dissolve it in water to make solution I; dissolve 1.96g of barium nitrate and 218.3g of cobalt nitrate hexahydrate in water to make a solution, then co-flow the solution with 450g of 6% by weight ammonia solution , filtered the precipitate, and washed repeatedly with deionized water to obtain fresh and clean mixed oxide II of barium oxide and cobalt oxide, mixed solution I and mixed oxide II to obtain slurry III; SiO 2 The sol, 0.084g potassium hydroxide and 0.098g 15% by weight dilute sulfuric acid were added to slurry III, mixed and beaten, and the pH value of the slurry was adjusted to 5 with ammonia water to obtain slurry IV (solid content 15wt%). The material is spray-dried and formed, the inlet temperature of the sprayer is 380°C, the outlet temperature is 230°C, and then roasted at a roasting temperature of 750°C and a roasting time of 6 hours to obtain an iron-based Fischer-Tropsch synthesis catalyst for a microspher...

Embodiment 2

[0025]Get 606.03g iron nitrate nonahydrate and dissolve in water to make solution I; 784g barium nitrate and 2.18g cobalt nitrate hexahydrate are dissolved in water to make solution, then the solution and 1800g of 6% by weight ammonia solution are co-currently precipitated, The precipitate was filtered and washed repeatedly with deionized water to obtain fresh and clean mixed oxide II of barium oxide and cobalt oxide, and the solution I was mixed with the mixed oxide II to obtain slurry III; 3412.6 g of 40% by weight SiO 2 The sol, 6.0g sodium hydroxide and 19.6g 15% by weight dilute phosphoric acid were added to the slurry III, mixed and beaten, and the pH value of the slurry was adjusted to 1 with dilute nitric acid at the same time to obtain slurry IV (solid content: 45wt%). The slurry is spray-dried and shaped, the inlet temperature of the sprayer is 200°C, the outlet temperature is 100°C, and then roasted at a roasting temperature of 400°C and a roasting time of 0.15h to ...

Embodiment 3

[0029] Get 606.03g iron nitrate nonahydrate and dissolve in water to make solution I; 686g barium nitrate and 3.49g nickel nitrate hexahydrate are dissolved in water to make solution, then the solution and 1550g of 6% by weight ammonia solution are co-currently precipitated, The precipitate was filtered and washed repeatedly with deionized water to obtain fresh and clean mixed oxide II of barium oxide and nickel oxide, and the solution I was mixed with the mixed oxide II to obtain slurry III; 472.87g of 20% by weight TiO2 sol, 13.8g rubidium hydroxide and 17.2g 15% by weight dilute phosphoric acid were added to slurry III, mixed and beaten, and the pH value of the slurry was adjusted to 2.3 with dilute nitric acid at the same time to obtain slurry IV (solid content 35wt%). The slurry is spray-dried and molded, the inlet temperature of the sprayer is 300°C, and the outlet temperature is 180°C, and then roasted at a roasting temperature of 450°C and a roasting time of 0.5h to obt...

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Abstract

The invention relates to a catalyst for Fischer-Tropsch synthesis of low carbon olefins and its preparation method, and mainly solves the problems of easy deactivation of catalysts and low weight selectivity of low carbon olefins for the reason that Fischer-Tropsch synthesis reactions in the prior art are strongly-exothermic reactions, and when a fixed bed is used, heat is difficult to remove from a reactor, and temperature runaway is easy. The catalyst comprises the following components by weight: a) 10 to 70 parts of a carrier which is at least one selected from the group consisting of oxides of Si or Ti ; and b) 30 to 90 parts of an active component. The active component contains, by atomic ratio, a composition with a chemical formula shown as follows: Fe100AaBbCcOx, wherein A is selected from one of Ba or Sr; B is selected from one of Co or Ni; C is selected from an alkali metal; and by the technical scheme, the problems of easy deactivation of the catalysts and low weight selectivity of the low carbon olefins can be solved, and the catalyst can be used for the industrial production of Fischer-Tropsch synthesis of the low carbon olefins.

Description

technical field [0001] The invention relates to an iron-based catalyst for Fischer-Tropsch synthesis of low-carbon olefins and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the demand for petroleum resources and its products is increasing day by day. my country's energy is characterized by rich coal, little gas, and oil shortage. Lack of oil resources and insufficient domestic oil supply have become a severe reality for my country's energy development. With the development of the national economy, the contradiction between oil supply and demand will continue to expand, and get rid of the energy structure. The dependence on oil resources has become an urgent problem to be solved. This has just prompted people to actively and diligently develop other alternative energy sources, and the environmental pollution caused by the direct combustion of coal has also been paid more and more attention. The development of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C10G2/00
Inventor 庞颖聪陶跃武宋卫林李剑锋
Owner CHINA PETROLEUM & CHEM CORP
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