a kind of lafeo 3 -(cu-al@al 2 o 3 -coo) high temperature composite phase change heat storage oxygen carrier preparation method and application

A composite phase change and oxygen carrier technology, which is applied in metal/metal oxide/metal hydroxide catalysts, heat exchange materials, chemical instruments and methods, etc., can solve Fe's insufficient oxygen storage capacity, unfavorable cycle operation, reaction The speed is not high, to achieve the effect of improving energy utilization efficiency, reducing energy consumption, and uniform particle size

Active Publication Date: 2021-07-16
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0005] Although the Ni-based oxygen carrier has very high reactivity, it is easy to generate toxic sulfides during the reaction process, and its own porous nature leads to a low reaction rate; the Cu-based oxygen carrier is easily decomposed into Cu 2 O, and under high-temperature reaction conditions, sintering often occurs due to its low melting point, and the reaction rate of Cu-based oxygen carriers decreases rapidly after several cycles of reaction
Although Co, Mn, Cd, etc. have good performance, but the cost is high
The lattice oxygen lost by Fe-based oxygen carriers after deep reduction is difficult to be replenished, which is not conducive to the cyclic operation of the reaction; although LaO has good oxygen storage performance, its price is relatively high
The mixture of Fe-La-based oxygen carrier can not only solve the problem of insufficient oxygen storage capacity of Fe but also solve the problem of high cost of La-based

Method used

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  • a kind of lafeo <sub>3</sub> -(cu-al@al <sub>2</sub> o <sub>3</sub> -coo) high temperature composite phase change heat storage oxygen carrier preparation method and application
  • a kind of lafeo <sub>3</sub> -(cu-al@al <sub>2</sub> o <sub>3</sub> -coo) high temperature composite phase change heat storage oxygen carrier preparation method and application
  • a kind of lafeo <sub>3</sub> -(cu-al@al <sub>2</sub> o <sub>3</sub> -coo) high temperature composite phase change heat storage oxygen carrier preparation method and application

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Embodiment 1

[0040] Embodiment 1: A kind of core-shell structure LaFeO 3 -(Cu-Al@Al 2 o 3 -CoO) high temperature composite phase change heat storage oxygen carrier preparation method, the specific steps are:

[0041] (1) Copper-aluminum alloy powder, Co(NO 3 ) 2 , NH 4 F is added to water to prepare copper-aluminum alloy powder turbid liquid, Co(NO 3 ) 2 solution and NH 4 F solution; where copper aluminum alloy powder, Co(NO 3 ) 2 , NH 4 The mass ratio of F is 10:2:3, the concentration of copper-aluminum alloy powder in the turbid solution of copper-aluminum alloy powder is 30g / L, Co(NO 3 ) 2 Co(NO 3 ) 2 The concentration is 0.16mol / L, NH 4 NH in F solution 4 The concentration of F is 0.2mol / L;

[0042] (2) Put the copper-aluminum alloy powder turbid solution in step (1) in an ultrasonic wave with a power of 70W and perform ultrasonic treatment for 10 minutes to obtain a copper-aluminum alloy powder suspension;

[0043] (3) Add gelatin to the Co(NO 3 ) 2 solution, in whi...

Embodiment 2

[0052] Embodiment 2: A kind of core-shell structure LaFeO 3 -(Cu-Al@Al 2 o 3 -CoO) high temperature composite phase change heat storage oxygen carrier preparation method, the specific steps are:

[0053] (1) Copper-aluminum powder, Co(NO 3 ) 2 , NH 4 F is added to water to prepare copper-aluminum powder turbid liquid, Co(NO 3 ) 2 solution and NH 4 F solution; where copper aluminum alloy powder, Co(NO 3 ) 2 , NH 4 The mass ratio of F is 5:1:2, the concentration of copper-aluminum alloy powder in the turbid solution of copper-aluminum alloy powder is 10g / L, Co(NO 3 ) 2 Co(NO 3 ) 2 The concentration is 0.05mol / L, NH 4 NH in F solution 4 The concentration of F is 0.1mol / L;

[0054] (2) Place the copper-aluminum powder turbid solution in step (1) in an ultrasonic wave with a power of 40W for 5 minutes to obtain a copper-aluminum powder suspension;

[0055] (3) Add gelatin to the Co(NO 3 ) 2 solution, in which gelatin and Co(NO 3 ) 2 The solid-to-liquid ratio g:...

Embodiment 3

[0064] Embodiment 3: A kind of core-shell structure LaFeO 3 -(Cu-Al@Al 2 o 3 -CoO) high temperature composite phase change heat storage oxygen carrier preparation method, the specific steps are:

[0065] (1) Copper-aluminum powder, Co(NO 3 ) 2 , NH 4 F is added to water to prepare copper-aluminum powder turbid liquid, Co(NO 3 ) 2 solution and NH 4 F solution; where aluminum alloy powder, Co(NO 3 ) 2 , NH 4 The mass ratio of F is 20:3:5, the concentration of copper-aluminum alloy powder in the turbid solution of copper-aluminum alloy powder is 50g / L, Co(NO 3 ) 2 Co(NO 3 ) 2 The concentration is 0.2mol / L, NH 4 NH in F solution 4 The concentration of F is 0.3mol / L;

[0066] (2) Place the copper-aluminum powder turbid solution in step (1) in an ultrasonic wave with a power of 80W for 30 minutes to obtain a copper-aluminum powder suspension;

[0067] (3) Add gelatin to the Co(NO 3 ) 2 solution, in which gelatin and Co(NO 3 ) 2 The solid-to-liquid ratio g:L of t...

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Abstract

The present invention relates to a kind of LaFeO 3 ‑(Cu‑Al@Al 2 o 3 -CoO) The preparation method and application of high-temperature composite phase-change thermal storage oxygen carrier belong to the technical field of high-temperature phase-change thermal storage oxygen carrier. The present invention adopts the co-precipitation method, adds the core-shell structure composite phase change thermal storage material in the lanthanum salt-iron salt mixed solution, reacts under the pH value of the solution adjusted by ammonia water, and roasts at high temperature to obtain the core-shell structure LaFeO 3 ‑(Cu‑Al@Al 2 o 3 ‑CoO) regenerative oxygen carrier. Core-shell structure LaFeO 3 ‑(Cu‑Al@Al 2 o 3 ‑CoO) high-temperature composite phase change heat storage oxygen carrier is made of inner core phase change heat storage material copper aluminum alloy, inner layer Al 2 o 3 ‑CoO, shell LaFeO 3 Composed of oxygen carriers, the combination of multiple shells makes the regenerative oxygen carrier structure more stable, and the shell cladding layer is denser, which can effectively prevent the leakage of copper and aluminum in the molten state of the inner core. The phase change heat of the core copper-aluminum alloy also provides a continuous and controllable temperature regulation for the chemical chain hydrogen production reaction, making the hydrogen produced by the reaction continuous and stable. Simultaneous composite phase change of LaFeO in thermal storage oxygen carrier 3 It has high efficiency, stable catalytic activity and repeated recycling.

Description

technical field [0001] The invention relates to a core-shell structure LaFeO 3 -(Cu-Al@Al 2 o 3 The invention relates to a preparation method and application of a high-temperature composite phase-change thermal storage oxygen carrier of -CoO, belonging to the technical field of high-temperature composite phase-change thermal storage oxygen carriers. Background technique [0002] As the most important energy consumed in the world at present, traditional fossil energy not only obtains energy, but also produces a large amount of CO in the process of utilization. 2 , leading to the greenhouse effect. Hydrogen has clear advantages over conventional fossil fuels. The calorific value of hydrogen is high, and the product of hydrogen combustion is only water, which does not produce greenhouse gases. Therefore, hydrogen is a clean and efficient fuel with great application prospects. Although there are many methods for traditional hydrogen production, the chemical chain hydrogen p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C09K5/06
CPCB01J23/002B01J23/83B01J35/0073B01J2523/00C09K5/06B01J2523/31B01J2523/3706B01J2523/17B01J2523/842
Inventor 李孔斋张凌田孟爽陈艳鹏隆颜徽
Owner KUNMING UNIV OF SCI & TECH
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