Effect of Preparation Method on the Structural Characteristics of NiO-ZrO₂ Oxygen Carriers for Chemical-looping Combustion

Abstract

Chemical-looping combustion(CLC) offers an effective approach for power generation and CO₂ capture. In this work, an NiO-ZrO₂ oxygen carrier prepared by three methods was subjected to an optimal reaction temperature test, an optimal flow test and a cyclic redox reaction test to explore the most suitable reaction conditions. Through comparative analysis, it is noted that the coprecipitation method is not suitable for the preparation of this NiO-ZrO₂ oxygen carrier, while the oxygen carrier prepared by the mechanical mixing method and solution combustion method obtained a higher CH₄ conversion rate and CO₂ selectivity. In addition, these two oxygen carriers also showed high stability during successive CLC testing. Therefore, both the mechanical mixing method and the solution combustion method can be used to prepare NiO-ZrO₂ oxygen carriers.

Keywords

Chemical-looping combustion / NiO-ZrO₂ oxygen carrier / Solution combustion method / Mechanical mixing method / Coprecipitation method

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