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Oxygen carrier for chemical-looping combustion and cracking and preparation method and application thereof

A technology of chemical chain combustion and oxygen carrier, applied in chemical instruments and methods, combustion methods, carbon preparation/purification, etc. Ease of industrial production, improved stability, environmentally friendly effects

Inactive Publication Date: 2020-06-12
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reactivity of metal Ni is high, metal Ni particles will be agglomerated and deactivated after a period of reaction, and it is generally loaded on Al 2 o 3 , SiO 2 、TiO 2 , MgAl 2 o 4 etc. inert oxygen carrier to improve its catalytic / mechanical properties, but still have the disadvantages of poor stability, poor carbon deposition resistance, and easy deactivation

Method used

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  • Oxygen carrier for chemical-looping combustion and cracking and preparation method and application thereof
  • Oxygen carrier for chemical-looping combustion and cracking and preparation method and application thereof
  • Oxygen carrier for chemical-looping combustion and cracking and preparation method and application thereof

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preparation example Construction

[0037] The preparation method of the above-mentioned oxygen carrier is one of preparation methods such as co-precipitation method, sol-gel method, combustion method and impregnation method.

[0038] Specifically, the oxygen carrier is prepared by the co-precipitation method: measure a certain amount of deionized water, heat it to 60°C, add the precursors of La / Ba, Fe, Al, and Ni in a certain proportion and order to prepare a uniformly mixed solution . Add the homogeneously mixed precursor solution to the saturated ammonium carbonate solution (saturated ammonium carbonate is excessive, 1.5 times the amount of substances required for precipitation of lanthanum / barium, iron, aluminum, nickel), add ammonia water to adjust the pH to 8-11 , stirred evenly at 60°C for 6h, filtered the precipitate and dried it, then calcined at 400-500°C for 2-5h, then calcined at 600-1000°C for 2-5h, and naturally cooled to room temperature to obtain NiO-AFe x Al 12-x o 19 (A = La, Ba) carrier.

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Embodiment 1

[0049] NiO-BaFe 2 al 10 o 19 Composite oxygen carrier, the molar ratio of nickel to iron is 5:1.

[0050] Measure a certain amount of deionized water, heat it to 60°C, add barium nitrate, iron nitrate, aluminum nitrate and nickel nitrate in a molar ratio of 1:2:10:10, and prepare a uniformly mixed nitrate solution, barium nitrate, nitric acid The concentrations of iron, aluminum nitrate and nickel nitrate are all 1mol / L. Add the uniformly mixed nitrate solution to 1mol / L ammonium carbonate solution (excess saturated ammonium carbonate, which is 1.5 times the content required for the precipitation of barium, iron, aluminum, nickel), add ammonia water to adjust the pH to 10, at 60°C Stir evenly for 6 hours, filter the precipitate, and dry the precipitate, firstly calcining at a heating rate of 2°C / min from room temperature to 500°C for 4 hours, then heating at a rate of 2°C / min to 700°C for 4 hours, and then cooling down to room temperature naturally , to get NiO-BaFe 2 al 1...

Embodiment 2

[0052] Measure a certain amount of deionized water, heat it to 60°C, add lanthanum nitrate, ferric chloride, aluminum chloride and nickel chloride in a molar ratio of 1:4:8:8, and prepare a well-mixed salt solution. Lanthanum nitrate The concentrations of , ferric chloride, aluminum chloride and nickel chloride are all 1mol / L. Add the well-mixed salt solution to 0.9mol / L ammonium carbonate solution (saturated ammonium carbonate is excessive, which is 1.5 times the content required for the precipitation of lanthanum, iron, aluminum, and nickel), add ammonia water to adjust the pH to 8, at 60°C Stir evenly for 6 hours, filter the precipitate, and dry the precipitate, firstly calcining at a heating rate of 2°C / min from room temperature to 400°C for 5 hours, then heating at a heating rate of 2°C / min to 800°C for 2 hours, and then cooling down to room temperature naturally , to obtain oxygen carriers.

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Abstract

The invention relates to an oxygen carrier for chemical-looping combustion and cracking and a preparation method and application thereof. The general formula of the oxygen carrier is NiO-AFexAl12-xO19(A = La or Ba, 0 < x < 5), and the molar ratio range of ferronickel is 0-10. Nickel nitrate, ferric nitrate, aluminum nitrate and lanthanum nitrate / barium nitrate are used as precursors to prepare anitrate solution, then coprecipitation is carried out, suction filtration, washing, drying and roasting are carried out, and the preparation method is simple and easy to industrialize. The oxygen carrier has a CH4 conversion rate of nearly 100% and CO2 selectivity of 100% in a chemical looping combustion stage and CO2 can be captured at a low cost. Besides, the oxygen carrier obtained after the chemical-looping combustion reaction is used for methane catalytic cracking hydrogen production, the CH4 conversion rate is 100%, and high-purity H2 and nanocarbon materials can be produced; when the oxygen carrier is used for chemical-looping combustion and methane cracking, the reaction activity is high, the cycling stability is high and the economical efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of methane chemical looping combustion, methane cracking hydrogen production and carbon material, carbon gasification oxygen carrier, and specifically relates to an oxygen carrier used for chemical looping combustion and cracking and its preparation method and application. Background technique [0002] In recent years, although the development of non-fossil fuel energy has been continuously intensified, at present, fossil fuels such as crude oil and raw coal are still used as the main energy supply. The large amount of greenhouse gases emitted during the burning of fossil fuels will cause global warming and lead to environmental degradation. During the traditional combustion of fossil fuels, due to the N in the air 2 dilution, CO 2 The cost of separation is high, so there is an urgent need to reduce CO 2 The separation cost to achieve its cheap capture. Compared with traditional fossil fuels, hydrogen en...

Claims

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Application Information

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IPC IPC(8): B01J23/78F23D14/32C01B3/26C01B32/05
CPCB01J23/002B01J23/78B01J2523/00C01B3/26C01B2203/0277C01B2203/1241C01B32/05F23D14/32B01J2523/25B01J2523/31B01J2523/842B01J2523/847Y02P30/00
Inventor 朱燕燕程铮任豪闫明杨倩马晓迅
Owner NORTHWEST UNIV
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