Supercharge Your Innovation With Domain-Expert AI Agents!

Composition containing precipitated theta iron carbide, preparation method of composition, catalyst, application of catalyst, and Fischer-Tropsch synthesis method.

A Fischer-Tropsch synthesis and composition technology, which is used in the preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, chemical instruments and methods, etc. The effect of low CO2 selectivity

Active Publication Date: 2021-03-30
CHNA ENERGY INVESTMENT CORP LTD +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve how iron-based catalysts can obtain pure-phase iron carbide materials without Fe impurities, and improve the stability of Fischer-Tropsch synthesis while reducing CO 2 or CH 4 The problem of high selectivity of by-products provides a composition containing precipitated θ iron carbide and its preparation method, catalyst and application, and a method for Fischer-Tropsch synthesis

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composition containing precipitated theta iron carbide, preparation method of composition, catalyst, application of catalyst, and Fischer-Tropsch synthesis method.
  • Composition containing precipitated theta iron carbide, preparation method of composition, catalyst, application of catalyst, and Fischer-Tropsch synthesis method.
  • Composition containing precipitated theta iron carbide, preparation method of composition, catalyst, application of catalyst, and Fischer-Tropsch synthesis method.

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0045] In a preferred embodiment of the present invention, the drying and roasting process includes: first drying the solid at a temperature of 35-80°C and a vacuum of 250-1200Pa for 6-10 hours; Dry at 75-180°C for 3-24h, and then roast the obtained material at 250-580°C for 1-10h. The above drying process can be performed in an oven, and the roasting process can be performed in a muffle furnace.

[0046] In some embodiments of the present invention, step (2) can simultaneously generate nano-iron powder in situ from the iron element in the precursor and reduce the generated nano-iron powder.

[0047] In some embodiments of the present invention, H in step (2) 2 Can be H 2 The form of flow is passed into the reaction system, and at the same time, by controlling the H 2 Flow pressure to control the pressure of the precursor reduction, preferably, in step (2), the pressure of the precursor reduction is 0.1-15atm, preferably 0.3-2.6atm, and the time is 0.7-15h, preferably 1-12h...

Embodiment 1

[0084] (1) Mix ferric nitrate with a concentration of 1.2mol / L and 0.9mol / L sodium carbonate solution at 55°C and pH=6.2 to obtain a precipitated slurry, wash with deionized water, filter to obtain a filter cake, and dry at 110°C 24h, 400°C calcined for 10h to obtain the precursor.

[0085] (2) Combine the precursor with H 2 At a pressure of 2.6atm, H 2 The flow rate is 22000mL / h / g, and the precursor reduction is carried out at a temperature of 470°C for 12h;

[0086] (3) Cool the product obtained in step (2) from 470°C to 400°C at a rate of 1.5°C / min, and mix with H at this temperature 2 Contact with CO mixed gas to prepare precipitated carbides, the conditions are: pressure 20atm, total gas flow 20000mL / h / g, H 2 The molar ratio to CO is 60:1, and the treatment time is 24 hours to obtain precipitated iron carbide, which is determined as pure θ iron carbide by Mössbauer spectroscopy, which is recorded as iron carbide 1;

[0087] (4) Under the protection of Ar gas, mix 97 m...

Embodiment 2

[0089] (1) Mix the ammonium carbonate solution with a concentration of 1.3mol / L ferric ammonium citrate and 0.7mol / L at 65°C and pH=6.9 to obtain a precipitated slurry, wash with deionized water, and filter to obtain a filter cake, 110 ℃ drying for 24 hours, and 300 ℃ calcination for 10 hours to obtain the precursor.

[0090] (2) Combine the precursor with H 2 At a pressure of 0.3atm, H 2 The flow rate is 2800mL / h / g, and the precursor reduction is carried out at a temperature of 620°C for 1h;

[0091] (3) Cool the product obtained in step (2) from 620°C to 300°C at a rate of 1.5°C / min, and mix with H at this temperature 2 Contact with CO mixed gas to prepare precipitated carbides, the conditions are: pressure 0.01atm, total gas flow 1200mL / h / g, H 2 The molar ratio to CO is 60:1, and the treatment time is 80h, to obtain precipitated iron carbide, which is determined as pure θ iron carbide by Mössbauer spectroscopy, which is recorded as iron carbide 2;

[0092] (4) Under the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of Fischer-Tropsch synthesis reaction, and discloses a composition containing precipitated theta iron carbide, a preparation method of the composition, a catalyst, application of the catalyst, and a Fischer-Tropsch synthesis method. The composition containing precipitated theta iron carbide comprises 95-100 mol% of precipitated theta iron carbide and 0-5 mol% ofan Fe-containing impurity, wherein the Fe-containing impurity is an iron-containing substance other than theta iron carbide, and the specific surface area of the composition is 20-275 m<2> / g. According to the invention, theta iron carbide can be simply and conveniently prepared and is used as an active component to obtain a continuous and stable Fischer-Tropsch synthesis reaction, and the selectivity of effective products is high.

Description

technical field [0001] The invention relates to the field of Fischer-Tropsch synthesis reaction, in particular to a composition containing precipitated θ iron carbide, a preparation method thereof, a catalyst and its application, and a method of Fischer-Tropsch synthesis. Background technique [0002] my country's primary energy structure is characterized by rich coal, short of oil, and little gas. With the development of my country's economy, the dependence on foreign oil has been increasing. [0003] Fischer-Tropsch synthesis is an increasingly important energy conversion pathway in recent years, which can combine carbon monoxide with H 2 of syngas into liquid fuels and chemicals. [0004] The reaction equation of Fischer-Tropsch synthesis is as follows: [0005] (2n+1)H 2 +nCO→C n h 2n+2 +nH 2 O(1), [0006] 2nH 2 +nCO→C n h 2n +nH 2 O (2). [0007] In addition to alkanes and alkenes, industrial Fischer-Tropsch synthesis produces by-product carbon dioxide (CO...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J37/03B01J35/10B01J37/18C10G2/00
CPCB01J27/22B01J37/03B01J37/031B01J37/18C10G2/332B01J35/613B01J35/615
Inventor 王鹏林泉赵华博缪平门卓武孟祥堃张琪
Owner CHNA ENERGY INVESTMENT CORP LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com