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Effective Macroporous Core–Shell Structure of Alumina‐Supported Spinel Ferrite for Carbon Dioxide Splitting Based on Chemical Looping
Author(s) -
Fu Yu,
Li Shenggang,
Zhang Jun,
Sun Yuhan
Publication year - 2016
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.201600142
Subject(s) - spinel , x ray photoelectron spectroscopy , chemical looping combustion , materials science , desorption , chemical engineering , solid solution , ferrite (magnet) , adsorption , analytical chemistry (journal) , oxygen , chemistry , metallurgy , composite material , organic chemistry , chromatography , engineering
Spinel ferrite (NiFe 2 O 4 ) supported on spherical Al 2 O 3 was used to split CO 2 based on chemical looping. The NiFe 2 O 4 /Al 2 O 3 material, which had a macroporous core–shell structure, was obtained by pretreating the Al 2 O 3 support at 1200 °C. It displays the highest redox capacity and the best reproducibility during the chemical looping amongst all the samples tested. However, the pretreatment of the Al 2 O 3 support at other temperatures leads to structures that are unfavorable for the diffusion of CO 2 and oxygen, which thus reduces the reactivity. N 2 adsorption–desorption isotherms, XRD, field‐emission SEM, TEM, energy‐dispersive X‐ray spectroscopy, and X‐ray photoelectron spectroscopy were used to elucidate the formation of the macroporous core–shell structure and the other unfavorable structures. The initial structure, phase of the Al 2 O 3 support, and the process of spinel formation in solid solutions influence the structural evolution of the NiFe 2 O 4 /Al 2 O 3 materials significantly.