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Chemical‐looping gasification of coal with CuFe 2 O 4 oxygen carriers: The reaction characteristics and structural evolution
Author(s) -
An Mei,
Guo Qingjie,
Ma Jingjing,
Hu Xiude
Publication year - 2020
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23716
Subject(s) - chemical looping combustion , syngas , inert , adsorption , coal , desorption , chemical engineering , oxygen , chemical reaction , hematite , carbon fibers , coal gasification , chemistry , scanning electron microscope , materials science , inert gas , mineralogy , catalysis , composite material , organic chemistry , composite number , engineering
In this study, coal gasification to produce synthesis gas by chemical looping was investigated with CuFe 2 O 4 oxygen carriers (OCs), including the reaction characteristics and structural evolution process. It was found that the presence of a CuFe 2 O 4 OC increases the gasification reaction rate of coal in comparison to the use of inert bed material (silica sand). The CuFe 2 O 4 OC enhanced the performance of hematite and improved the ability to produce syngas of CuO OCs. During the chemical looping process, CuFe 2 O 4 was reduced to Fe 3 O 4 and Cu. Furthermore, N 2 adsorption/desorption and scanning electron microscopy images verified that the released O 2 and the generated CO 2 by the CuFe 2 O 4 OCs improved the carbon conversion and facilitated the pore opening and expansion shown by the increase in specific surface area. This can be used as a theoretical reference that can be used to gain a better understanding of the microscopic mechanism for how CuFe 2 O 4 OCs can accelerate the chemical looping gasification of coal.
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