Premium
Chemical‐Looping Conversion of Methane: A Review
Author(s) -
Li Danyang,
Xu Ruidong,
Gu Zhenhua,
Zhu Xing,
Qing Shan,
Li Kongzhai
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900925
Subject(s) - chemical looping combustion , syngas , methane , air separation , oxygen , oxygen storage , chemical engineering , combustion , chemistry , carbon dioxide reforming , partial oxidation , steam reforming , methane reformer , materials science , catalysis , hydrogen production , organic chemistry , engineering
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.