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Method for preparing nano nickel oxide / nickel aluminum spinel oxygen carrier

An oxygen carrier and nanotechnology, which is applied in the field of material chemistry, can solve problems such as inability to effectively prepare microporous spinel powder, etc., and achieve the effects of low equipment requirements, simple production process technology, and easy process control.

Active Publication Date: 2017-12-12
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Comprehensive current synthesis methods are unable to effectively prepare stable microporous spinel powder

Method used

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  • Method for preparing nano nickel oxide / nickel aluminum spinel oxygen carrier
  • Method for preparing nano nickel oxide / nickel aluminum spinel oxygen carrier
  • Method for preparing nano nickel oxide / nickel aluminum spinel oxygen carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a nano-NiO / NiAl 2 o 4 The preparation method of oxygen carrier, comprises the following steps:

[0038] 1) Prepare a nitrate solution with a Ni / Al molar ratio of 2.25, wherein the Ni ion content is 0.45 mol / L, and the Al ion content is 0.2 mol / L, and prepare 500 mL of the nitrate solution. Prepare 200 mL of ammonium carbonate solution with a concentration of 0.5 mol / L.

[0039] 2) Slowly add 0.5mol / L ammonium carbonate solution to the stirring nitrate solution. The amount of ammonium carbonate solution added is about 150mL, the pH is controlled at 5.0, and a paste-like hydrosol is formed. Continue stirring with a glass rod to form a Certainly viscous hydrosol.

[0040] 3) Slowly dry the hydrosol in a vacuum drying oven at 60°C for 12 hours, and keep the vacuum at -0.01MPa, and then age it at 80°C for 6 hours in an air atmosphere to form a dry colloid with a certain shape.

[0041] 4) Heat the dried colloid in a muffle furnace at 400° C. for 2 ...

Embodiment 2

[0048] This embodiment provides a nano-NiO / NiAl 2 o 4 The preparation method of oxygen carrier, comprises the following steps:

[0049] 1) Prepare a nitrate solution with a Ni / Al molar ratio of 2.25, wherein the Ni ion content is 0.45 mol / L, and the Al ion content is 0.2 mol / L, and prepare 700 mL of the nitrate solution. Prepare 500 mL of ammonium carbonate solution with a concentration of 1.0 mol / L.

[0050] 2) Slowly add 0.25mol / L ammonium carbonate solution to the stirring nitrate solution, the amount of ammonium carbonate solution added is about 300mL, the pH is controlled at 5.5, keep stirring until a paste-like suspension is formed, continue to use a glass rod Stir to form a viscous hydrosol.

[0051] 3) Slowly dry the hydrosol in a vacuum drying oven at 65°C for 10 hours, and keep the vacuum at -0.01MPa, and then age it at 90°C for 3 hours in an air atmosphere to form a dry colloid with a certain shape.

[0052] 4) Heat the dried colloid in a muffle furnace at 450° ...

Embodiment 3

[0055] This embodiment provides a nano-NiO / NiAl 2 o 4 The preparation method of oxygen carrier, comprises the following steps:

[0056] 1) Prepare a nitrate solution with a Ni / Al molar ratio of 2.25, in which the Ni ion content is 0.45 mol / L, and the Al ion content is 0.2 mol / L, and prepare 300 mL of the nitrate solution. Prepare 200 mL of ammonium carbonate solution with a concentration of 0.25 mol / L.

[0057] 2) Slowly add 0.25mol / L ammonium carbonate solution to the stirring nitrate solution, the amount of ammonium carbonate solution added is about 100mL, the pH is controlled at 4.5, keep stirring until a paste-like suspension is formed, continue to use a glass rod Stir to form a viscous hydrosol.

[0058] 3) Slowly dry the hydrosol in a vacuum drying oven at 50°C for 24 hours, and keep the vacuum at -0.01MPa, and then age it at 75°C for 8 hours in an air atmosphere to form a dry colloid with a certain shape.

[0059] 4) Heat the dried colloid in a muffle furnace at 350...

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Abstract

The invention discloses a method for preparing a nano nickel oxide / nickel aluminum spinel oxygen carrier. The method comprises the steps of solution preparation; coprecipitation gel preparation; segmented temperature control aging; preheating forming; and calcination at high temperature. Co-gel of nickel-aluminum carbonate and nitrate is prepared by a partial coprecipitation method, the growth process of the crystal is controlled by controlling drying and aging temperature and time, the forming temperature and calcination temperature are controlled by utilizing the characteristics that metallic oxides decompose when heated and generate oxygen, micro oxygen enrichment conditions favorable for formation of spinel are created, and the nano-NiO / NiAl2O4 oxygen carrier can be obtained under simple conditions. The preparation process is simple, equipment requirements are low, and the process is easy to control, and mass production can be implemented. The oxygen carrier shows very strong redox capacity in chemical chain combustion. Therefore, the method has great potential when used for carbon dioxide capture in chemical chained combustion or raw water hydrogen production.

Description

technical field [0001] The invention belongs to the field of material chemistry, in particular to a nano-nickel oxide / nickel-aluminum spinel (NiO / NiAl 2 o 4 ) The preparation method of oxygen carrier. Background technique [0002] At present, the spinel is mainly magnesium-aluminum spinel. As spinel is used in more and more fields, aluminum-based spinel of other bivalent metals other than magnesium-aluminum spinel is also derived. Each application has its own emphasis. Among them, the chemical looping combustion oxygen carrier prepared by using nickel-aluminum spinel as an inert carrier has very strong chemical stability, which can provide stable support and at the same time enhance the redox performance of the oxygen carrier. Using NiO / NiAl 2 o 4 Oxygen carrier, not only can obtain 100% methane conversion rate, but also has enhanced mechanical strength and no obvious change in chemical composition after long-time reaction, which indicates that the oxygen carrier has a l...

Claims

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Application Information

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IPC IPC(8): C10L10/00B01J13/00B82Y40/00
CPCB01J13/0004B01J13/006B82Y40/00C10L10/00
Inventor 蒋恩臣孙焱许细薇李治宇王明峰任永志
Owner SOUTH CHINA AGRI UNIV
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