Preparation method of iron oxide-copper oxide-(copper-aluminum@alumina)high-temperature composite phase-change thermal storage oxygen carrier and application thereof

Abstract

The invention relates to a preparation method of an iron oxide-copper oxide-(copper-aluminum@alumina)high-temperature composite phase-change thermal storage oxygen carrier and an application thereof,which belongs to the technical field of the high-temperature composite phase-change thermal storage oxygen carrier. The method adopts a sol-gel method, and takes Cu as an auxiliary agent and Al2O3 asan inert carrier, and the cation of copper-iron-aluminum in a solution is effectively combined by a complexing agent and adhered to a core-shell structure Cu-Al@Al2O3 composite phase-change thermal storage material, and the encapsulation of Cu-Al@Al2O3 composite phase-change thermal storage material is carried out to obtain the Fe2O3-CuO-(Cu-Al@Al2O3) thermal storage oxygen carrier. The core-shellstructure Fe2O3-CuO-(Cu-Al@Al2O3)high-temperature composite phase-change thermal storage oxygen carrier is composed of a core phase-change heat storage material copper aluminum alloy, an inner layerAl2O3-CoO and an outer shell Fe2O3-CuO oxygen carrier. The combination of the multi-shell layer makes the structure of the thermal storage oxygen carrier more stable, a shell coating layer is denser,which can effectively prevent the leakage of the copper-aluminum alloy with the core in a molten state. The core copper-aluminum alloy phase-change heat provides continuous and controllable temperature regulation for a chemical chain hydrogen production reaction, so that the reaction generates hydrogen gas continuously and stably, and the composite phase-change thermal storage oxygen carrier can be recycled repeatedly.

Description

technical field [0001] The invention relates to a core-shell structure Fe 2 o 3 -CuO-(Cu-Al@Al 2 o 3 ) The preparation method and application of high-temperature composite phase-change thermal storage oxygen carrier belong to the technical field of high-temperature composite phase-change thermal storage oxygen carrier. 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 production technology uses fuel...

AI Technical Summary

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 carrier after deep reduction is difficult to be replenished, which is not conducive to the cycle operation of the reaction; although CeO has good oxygen storage performance, its price is relatively high

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