The gradually increasing atmospheric concentration of greenhouse gases has caused global climate change and subsequent environmental problems. To negate the emission of greenhouse gases from human activities, converting captured carbon into value-added products and changing our energy paradigm from fossil fuels to hydrogen both are significantly investigated. Chemical looping technology can offer several advantages since CO/H₂ production efficiency can be enhanced due to the inherent product separation and autothermal operation. This report presents a brief review of the chemical looping process combined with CO₂ or H₂O splitting to provide CO or H₂, respectively. Thermodynamic analysis was carried out to determine viable transition metal oxides. Various oxygen carriers for the chemical looping CO₂/H₂O splitting were categorized according to their structural characteristics. In addition, studies on different reactors, including fluidized-, moving bed-, and fixed bed-types which have proven their potential for realizing large-scale operation of chemical looping processes were summarized. Based on past advances and additional aspects of chemical looping, the authors strongly believe that this process offers a promising commercial technology that will contribute to carbon neutrality.

大气中温室气体浓度的逐渐增加引起了全球气候变化和随之而来的环境问题。为了消除人类活动产生的温室气体排放，将捕获的碳转化为增值产品，以及将我们的能源模式从化石燃料转变为氢，这两项工作都进行了重大研究。由于固有的产品分离和自热操作，可以提高CO/H _{2的生产效率，因此化学循环技术可以提供多种优势。}本报告简要回顾了化学循环过程与 CO ₂或 H ₂ O 裂解相结合以提供 CO 或 H ₂， 分别。进行热力学分析以确定可行的过渡金属氧化物。用于化学链 CO ₂ /H ₂ O 分解的各种氧载体根据其结构特征进行分类。此外，总结了对不同反应器的研究，包括流化床、移动床和固定床类型，这些反应器已证明它们在实现化学循环过程的大规模运行方面具有潜力。基于过去的进展和化学循环的其他方面，作者坚信这一过程提供了一种有前途的商业技术，将有助于实现碳中和。