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

Abstract

The invention relates to a preparation method and application of high-temperature composite phase change regenerative oxygen carrier of iron lanthanum oxide-(copper-aluminum@alumina), and belongs to the technical field of high-temperature composite regenerative oxygen carriers. Co-precipitation is utilized herein; a composite phase change regenerative material with core-shell structure is added toa lanthanum salt-iron salt mixed liquid; reacting is allowed by adjusting solution pH with ammonia water; high temperature roasting is performed to obtain core-shell LaFeO3-(Cu-Al@Al2O3) regenerativeoxygen carrier. The core-shell LaFeO3-(Cu-Al@Al2O3) high-temperature composite phase change regenerative oxygen carrier comprises core phase change regenerative material copper-aluminum alloy, innerAl2O3-CoO, and shell LaFeO3 oxygen carrier; multiple shells are combined such that the regenerative oxygen carrier has more stable structure; the shell covering layer is more compact, so that copper-aluminum leakage from the core in molten state can be effectively prevented. Core copper-aluminum alloy phase change heat also provides continuously controllable temperature control for chemical-chainhydrogen production reaction, so that hydrogen production by reaction is continuously stable. In addition, LaFeO3 in the composite phase change regenerative oxygen carrier has efficient and stable catalytic activity and is reusable.

Description

technical field [0001] The invention relates to a core-shell structure LaFeO 3 -(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 and a...

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 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

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