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Preparation method of core-shell structure Fe2O3-CeO2/(Al@C) high-temperature composite phase-change heat accumulation oxygen carrier

A fe2o3-ceo2, composite phase transition technology, applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problems of decreased reaction rate, unfavorable cycle operation, low reaction rate, etc., to prevent leakage, high mechanical strength, Enhance the effect of heat transfer

Active Publication Date: 2018-12-21
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 after deep reduction of Fe-based oxygen carriers is difficult to be replenished, which is not conducive to the cyclic operation of the reaction; CeO 2 Although the oxygen storage performance is good, but the price is higher

Method used

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  • Preparation method of core-shell structure Fe2O3-CeO2/(Al@C) high-temperature composite phase-change heat accumulation oxygen carrier
  • Preparation method of core-shell structure Fe2O3-CeO2/(Al@C) high-temperature composite phase-change heat accumulation oxygen carrier
  • Preparation method of core-shell structure Fe2O3-CeO2/(Al@C) high-temperature composite phase-change heat accumulation oxygen carrier

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Experimental program
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Effect test

Embodiment 1

[0044] Embodiment 1: as figure 2 As shown, a core-shell Fe 2 o 3 -CeO 2 / (Al@C) The preparation method of high-temperature composite phase change heat storage oxygen carrier, the specific steps are:

[0045] (1) Aluminum powder, NiCl 2 , NH 4 F is added to water to prepare aluminum powder turbid liquid, NiCl 2 solution and NH 4 F solution; including aluminum powder, NiCl 2 , NH 4 The molar ratio of F is 15:1.6:2, the concentration of aluminum powder in the aluminum powder turbid solution is 1.5mol / L, NiCl 2 NiCl in solution 2 The concentration is 0.16mol / L, NH 4 NH in F solution 4 The concentration of F is 0.2mol / L;

[0046] (2) Place the aluminum powder turbid solution in step (1) in an ultrasonic wave with a power of 70W and perform ultrasonic treatment for 10 minutes to obtain an aluminum powder suspension;

[0047] (3) Add gelatin to the NiCl in step (1) 2 solution, in which gelatin and NiCl 2 The solid-to-liquid ratio g:L of the solution is 10:1, stir even...

Embodiment 2

[0057] Embodiment 2: a kind of core-shell structure Fe 2 o 3 -Al 2 o 3 / (Al@C) The preparation method of high-temperature composite phase change heat storage oxygen carrier, the specific steps are:

[0058] (1) Aluminum powder, NiCl 2 , NH 4 F is added to water to prepare aluminum powder turbid liquid, NiCl 2 solution and NH 4 F solution; including aluminum powder, NiCl 2 , NH 4 The molar ratio of F is 5:0.5:1, the concentration of aluminum powder in the aluminum powder turbid solution is 0.5mol / L, NiCl 2 NiCl in solution 2 The concentration is 0.05mol / L, NH 4 NH in F solution 4 The concentration of F is 0.1mol / L;

[0059] (2) Place the aluminum powder turbid solution in step (1) in an ultrasonic wave with a power of 40W and perform ultrasonic treatment for 5 minutes to obtain an aluminum powder suspension;

[0060] (3) Add gelatin to the NiCl in step (1) 2 solution, in which gelatin and NiCl 2 The solid-to-liquid ratio g:L of the solution is 3:1, stir evenly at...

Embodiment 3

[0070] Embodiment 3: a kind of core-shell structure Fe 2 o 3 -Al 2 o 3 / (Al@C) The preparation method of high-temperature composite phase change heat storage oxygen carrier, the specific steps are:

[0071] (1) Aluminum powder, NiCl 2 , NH 4 F is added to water to prepare aluminum powder turbid liquid, NiCl 2 solution and NH 4 F solution; including aluminum powder, NiCl 2 , NH 4 The molar ratio of F is 20:2:3, the concentration of aluminum powder in the aluminum powder turbid solution is 2mol / L, NiCl 2 NiCl in solution 2 The concentration is 0.2mol / L, NH 4 NH in F solution 4 The concentration of F is 0.3mol / L;

[0072] (2) Place the aluminum powder turbid solution in step (1) in an ultrasonic wave with a power of 80W for 30 minutes to obtain the aluminum powder suspension;

[0073] (3) Add gelatin to the NiCl in step (1) 2 solution, in which gelatin and NiCl 2 The solid-to-liquid ratio g:L of the solution is 15:1, stir evenly at a temperature of 55°C, then add t...

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Abstract

The invention relates to a preparation method of a core-shell structure Fe2O3-CeO2 / (Al@C) high-temperature composite phase-change heat accumulation oxygen carrier and belongs to the technical field ofhigh-temperature composite phase-change heat accumulation oxygen carriers. The preparation method adopts a sol-gel method; Ce is used as an auxiliary agent and Al2O3 is used as an inert carrier; cations of cerium, iron and aluminum in a solution are effectively combined and attached on a core-shell structure Al@C composite phase-change heat accumulation material through the effect of a complexingagent, so that the Al@C composite phase-change heat accumulation material is packaged and structural characteristics of the material are kept, and the Fe2O3-CeO2 / (Al@C) heat accumulation oxygen carrier is obtained. The core-shell structure Fe2O3-CeO2 / (Al@C) high-temperature composite phase-change heat accumulation oxygen carrier is composed of an inner core phase-change heat accumulation materialaluminum, inner-layer Al2O3-NiO, middle-layer carbon fibers and a shell Fe2O3-CeO2 oxygen carrier; a plurality of types of shell layers are combined so that the structure of the heat accumulation oxygen carrier is more stable and a covering layer of a shell body is more dense; furthermore, aluminum with a fused state of an inner core can be effectively prevented from leakage; meanwhile, the core-shell structure high-temperature composite phase-change heat accumulation oxygen carrier can effectively and reasonably utilize energy, the heat transfer is enhanced, the heat efficiency is improved and the efficient catalysis is promoted.

Description

technical field [0001] The invention relates to a core-shell structure Fe 2 o 3 -CeO 2 The invention discloses a preparation method of (Al@C) high-temperature composite phase-change thermal storage oxygen carrier, which belongs to the technical field of high-temperature composite phase-change thermal storage oxygen carrier. Background technique [0002] CO 2 It is the main greenhouse gas that causes global warming. In recent years, global warming has caused incalculable losses to the production and life of people around the world. In this way, CO 2 Emission reduction is a very natural part of the global problem that needs to be solved urgently. In 1983, German scholars Richter and Knoche first proposed a new technology of non-mixed combustion of fuel and air. The original intention was to reduce the entropy change produced in the gas combustion process of thermal power plants, thereby improving the efficiency of energy use. Later, the technology was officially renamed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/06
Inventor 王华田孟爽李孔斋张凌陈艳鹏
Owner KUNMING UNIV OF SCI & TECH
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