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Chemical looping syngas from CO 2 and H 2 O over manganese oxide minerals
Author(s) -
Perreault Patrice,
Patience Gregory S.
Publication year - 2016
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.22432
Subject(s) - syngas , chemical looping combustion , carbon monoxide , manganese , hydrogen , oxide , carbon dioxide , chemistry , hydrogen production , oxygen , inorganic chemistry , water gas shift reaction , combustion , diffusion , catalysis , materials science , thermodynamics , biochemistry , organic chemistry , physics
Rather than sequestering carbon dioxide from the exhaust of chemical looping combustion reactors, together with the water, it could be used as a source of syngas. For the first time, we split water to hydrogen and carbon dioxide to carbon monoxide with a manganese ore. Specific CO production is 10–100 times higher than Sr, Ce, and Fe doped perovskites and Y 0.5 Sr 0.5 MnO 3 perovskites. At a contact time of 0.01 s and at temperatures ranging from 810–960 °C the maximum specific CO production was 5.5mol · kg − 1 . A combined kinetic‐axial dispersion hydrodynamic model accounts for 97 % of the variance in the data assuming the reaction rate is first‐order in CO 2 and surface reduced sites and in equilibrium with the reverse reaction—a first‐order reaction in CO with surface oxidized sites. A second reaction accounts for the diffusion of surface oxygen to the bulk lattice. Hydrogen productivity peaked at 4.8mol · kg − 1at 947 °C, which is twice as high as reported in previous studies on CoFe 2 O 4 and Al 2 O 3 in the hercynite cycle.