Exploring the potential of perovskite structures for chemical looping technology: A state-of-the-art review

In light of the increasing concern for sustainable growth and development, there is a rising demand for energy-efficient conversion processes. Chemical Looping (CL) technology has emerged as a promising solution that utilizes chemical intermediates, such as metal oxides or other metal derivatives, to decompose complex reactions into multiple sub-reaction steps. This innovative approach enables the separation of the overall reaction into distinct stages, which can be conducted in separate reactors. Consequently, the direct contact between inert substances present in reactant feedstocks and the desired product can be avoided, leading to reduced purification costs. This state-of-the-art literature review provides an updated overview of the potential of perovskite structures in chemical looping technology. Perovskite materials exhibit desirable properties, including excellent oxygen transport capabilities, high chemical stability, and adjustable redox properties, making them ideal candidates for CL applications. By examining recent advancements and research efforts, this review aims to shed light on the current state of perovskite based CL, its challenges, and future prospects. The findings presented here contribute to the understanding of the potential of perovskite structures in enabling energy-efficient and sustainable chemical conversion processes. This review includes two major parts, the first part is dedicated to the structure of the perovskites and the corresponding classifications based on the cell structure, ionic size cation phase, and dimension, while the second part of the work focuses on the applications of those structures in seven different chemical looping technologies, including chemical looping combustion (CLC), chemical looping reforming (CLR), chemical looping gasification (CLG), chemical looping oxygen uncoupling (CLOU), chemical looping air separation (CLAS), chemical looping dehydrogenation (CLDH), and chemical looping epoxidation (CLEPOX).