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Method for producing long-chain alkanes by hydrothermal reduction of carbon dioxide with iron powder and cobalt powder

A technology for long-chain alkanes and carbon dioxide, applied in chemical instruments and methods, from carbon oxides to hydrocarbons, metal/metal oxides/metal hydroxide catalysts, etc., can solve problems such as rapid catalyst deactivation, and avoid transportation , Huge stock and low cost

Active Publication Date: 2020-08-04
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the catalytic reaction process takes place in the water phase system, it solves the shortcoming of the rapid deactivation of the catalyst caused by the formation of carbon deposits on the surface active sites of the metal catalyst during the previous gas phase hydrogenation reduction process.

Method used

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  • Method for producing long-chain alkanes by hydrothermal reduction of carbon dioxide with iron powder and cobalt powder
  • Method for producing long-chain alkanes by hydrothermal reduction of carbon dioxide with iron powder and cobalt powder
  • Method for producing long-chain alkanes by hydrothermal reduction of carbon dioxide with iron powder and cobalt powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, commercial iron powder and cobalt powder reduction carbon dioxide are alkane

[0039] Such as figure 1 As shown, iron powder, cobalt powder and sodium bicarbonate are added to the batch reaction kettle according to the amount of substances of 100mmol, 200mmol and 400mmol, and then water is added, and the filling rate of the container is 40%. After the reaction kettle was sealed, it was placed in an induction heating furnace, and reacted at 250°C for 6 hours, and the system pressure was 20Mpa. The reacted gas mainly contains methane, ethane and propane. Dichloromethane was added to the liquid to extract long-chain alkanes. The yield of alkanes was ~1%, with a selectivity of 3-6%. The extracted liquid contains organic acids such as formic acid and acetic acid, and the corresponding chemicals can be obtained through fractional distillation.

[0040] figure 2 It is the scanning electron micrograph contrast figure of cobalt catalyst before and after rea...

Embodiment 2

[0042] Embodiment 2, commercial iron powder and cobalt powder reduction carbon dioxide are alkane

[0043] Iron powder, cobalt powder and sodium bicarbonate were added into the batch reaction kettle according to the amount of substances of 40mmol, 4mmol and 20mmol, and then water was added, and the filling rate of the container was 10%. After the reaction kettle was sealed, it was placed in an induction heating furnace, and reacted at 150° C. for 12 hours, and the system pressure was 1 Mpa. The reacted gas mainly contains methane, ethane and propane. Dichloromethane was added to the liquid to extract long-chain alkanes. The yield of alkanes was ~1%, with a selectivity of 3-6%. The extracted liquid contains organic acids such as formic acid and acetic acid, and the corresponding chemicals can be obtained through fractional distillation.

[0044] Figure 4 is the kinetic curve of the reaction, given by Figure 4 It can be seen that the reaction rate is relatively slow bef...

Embodiment 3

[0045] Embodiment 3, commercial iron powder and cobalt powder reduction carbon dioxide are alkane

[0046] Iron powder, cobalt powder and sodium bicarbonate are added into the batch reaction kettle according to the amount of substances 40mmol, 400mmol and 400mmol, and then water is added, and the filling rate of the container is 80%. After the reaction kettle was sealed, it was placed in an induction heating furnace, and reacted at 400°C for 0.5h, and the system pressure was 42Mpa. The reacted gas mainly contains methane, ethane and propane. Dichloromethane was added to the liquid to extract long-chain alkanes. The yield of alkanes was ~1%, with a selectivity of 3-6%. The extracted liquid contains organic acids such as formic acid and acetic acid, and the corresponding chemicals can be obtained through fractional distillation.

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Abstract

The invention relates to a method for producing long-chain alkane through hydrothermal reduction of carbon dioxide by utilizing iron powder and cobalt powder. The method comprises the following steps:decomposing in-situ hydrogen produced in water by taking the iron powder as a reducing agent, and enabling the carbon dioxide to react with the in-situ hydrogen for 0.5-12 h so as to to obtain the long-chain alkane (C1-C21) in a hydrothermal condition of 150-400 DEG C by taking the cobalt powder as a catalyst. According to the method, the in-situ hydrogen in the water is directly used, H2 gas does not require to be used, and the problems of transportation, storage, purity and the like of H2 are avoided; compared with hydrogen gas, the in-situ hydrogen decomposed in the water has higher activity, and the long-chain alkane has a faster generation rate. In the hydrothermal reaction process, a special honeycomb nanosheet is in situ synthesized by the cobalt powder, and becomes an active center for catalysis of the generation of the long-chain alkane. The whole process is simple and efficient, only ordinary iron and cobalt powder requires to be used, a particular catalyst specially synthesized by a complicated process is not required, and the method has very broad industrial application prospects.

Description

technical field [0001] The invention relates to a new method for producing long-chain alkanes by using iron powder and cobalt powder to hydrothermally reduce carbon dioxide, and belongs to the technical field of environmental engineering and the technical field of resource utilization of carbon dioxide. Background technique [0002] The rapid development of modern society consumes a large amount of precious fossil fuel energy (coal, oil, natural gas, etc.), and produces a large amount of greenhouse gas carbon dioxide into the atmosphere, which leads to a series of imminent global climate and environmental problems such as the greenhouse effect. Reducing and transforming carbon dioxide into high-value-added fine chemicals or energy fuels can not only "turn waste into wealth" and reduce carbon dioxide emissions, but also convert renewable energy such as electric energy into high-energy-density energy fuels for storage. Important scientific value and practical significance. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/02C07C9/02C07C9/14C07C9/22C07C11/02B01J23/75B01J35/04B01J35/02
CPCB01J23/75B01J35/02B01J35/04C07C1/02C07C2523/75C07C9/02C07C9/14C07C9/22C07C11/02
Inventor 金放鸣何道平王晓光钟恒
Owner SHANGHAI JIAOTONG UNIV
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