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Fe‐substituted Ba‐hexaaluminates oxygen carrier for carbon dioxide capture by chemical looping combustion of methane
Author(s) -
Tian Ming,
Wang Xiaodong,
Liu Xin,
Wang Aiqin,
Zhang Tao
Publication year - 2016
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15135
Subject(s) - chemical looping combustion , oxygen , combustion , chemistry , methane , carbon dioxide , redox , reactivity (psychology) , carbon fibers , sintering , chemical engineering , reducing atmosphere , inorganic chemistry , materials science , organic chemistry , medicine , alternative medicine , pathology , composite number , engineering , composite material
Fe‐substituted Ba‐hexaaluninates (BFA‐x (x = 1–3), x indicates Fe content) oxygen carrier (OC) were found to exhibit excellent sintering‐resistance under cyclic redox atmosphere at 800°C thanks to the reservations of the structure during the CH 4 reduction step, thus preventing the agglomeration of particles during the subsequent reoxidation step. Lattice oxygen highly active for the total combustion of CH 4 was observed in the hexaaluminate structure and its chemical state was influenced by Fe content. The highest amount of active O coordinated with Fe 3+ in the mirror plane (O‐Fe 3+ (M)) for the total combustion was reacted (0.77 mmol/g) for BaFe 3 Al 9 O 19 hexaaluminate OC. As a result, it exhibited the best reactivity with the CH 4 conversion of 83% and CO 2 selectivity of 100%. Moreover, superior regeneration and recyclability was also obtained, which originated from the fully recovery of O‐Fe 3+ (M) in the hexaaluminate structure. © 2015 American Institute of Chemical Engineers AIChE J , 62: 792–801, 2016