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High performance of la‐promoted Fe 2 O 3 /α‐Al 2 O 3 oxygen carrier for chemical looping combustion
Author(s) -
Tian Ming,
Wang Chaojie,
Li Lin,
Wang Xiaodong
Publication year - 2017
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.15634
Subject(s) - sintering , calcination , chemical looping combustion , reactivity (psychology) , redox , combustion , oxygen , chemistry , oxide , breakage , chemical stability , chemical reaction engineering , chemical reaction , thermal stability , phase (matter) , chemical engineering , materials science , inorganic chemistry , catalysis , organic chemistry , composite material , medicine , alternative medicine , pathology , engineering
Iron oxide supported oxygen carrier (OC) is regarded to a promising candidate for chemical looping combustion (CLC). However, phase separation between Fe 2 O 3 and supports often occurs resulted from the severe sintering of supports during calcination, which leads to the sintering and breakage of Fe 2 O 3 thus the decrease of redox reactivity. In this article, La‐promoted Fe 2 O 3 /α‐Al 2 O 3 were used as OCs for CLC of CH 4 and for the first time found that the OC with the addition of 18 wt % La exhibited outstanding reactivity and redox stability during 50 cycles of CLC of CH 4 . Such a superior performance originated from the formation of LaAl 12 O 19 hexaaluminate (La‐HA) phase with not only small particle size but also excellent thermal stability at CLC conditions, which worked as a binder to prevent the phase separation thereby the sintering and breakage of active species α‐Fe 2 O 3 were avoided during reaction. © 2017 American Institute of Chemical Engineers AIChE J , 63: 2827–2838, 2017