Methane reformer

Methane

Catalysis

Engineering

Materials science

Steam reforming

Air separation

Syngas

Chemical engineering

Oxygen storage

Chemical looping combustion

Organic chemistry

Oxygen

Combustion

Environmental science

Partial oxidation

Chemistry

Hydrogen production

Carbon dioxide reforming

Energy Technology

Chemical‐looping technology provides a versatile platform to convert methane in a clean and efficient manner, achieving CO 2 capture and generation of syngas/pure H 2 without additional separation processes (e.g., separation of CO 2 from N 2 ‐diluted exhaust gases, separation of O 2 from air, and separation of H 2 from syngas) using a two‐step redox concept through recyclable oxygen storage materials (named oxygen carriers) as intermediates. The design and elaboration of appropriate oxygen carriers is a key issue to effectively optimize the products and energy distribution. Various oxygen storage materials (e.g., Fe‐based, Ni‐based, Cu‐based, Ce‐based, perovskite‐type oxides and their mixed oxides) have been widely investigated with the corresponding chemical‐looping process. This work aims to comprehensively describe the advances of chemical‐looping conversion of methane, including chemical‐looping combustion, partial oxidation, steam reforming, and dry reforming technologies. Specifically, this Review focuses on the development of oxygen carriers, including the effects of composition, micro and macro structures, morphology, and supports on the performance for selective conversion of methane. The advances in understanding the reaction mechanisms between methane and different oxygen carriers in chemical‐looping processes are also discussed. Finally, future research directions for developing high‐performance oxygen carriers are proposed.

Chemical‐Looping Conversion of Methane: A Review