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Decomposition of Carbon Dioxide to Carbon with Active Wustite at 300°C
Author(s) -
Kodama Tatsuya,
Tominaga Kenichi,
Tabata Masahiro,
Yoshida Takashi,
Tamaura Yutaka
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb05574.x
Subject(s) - wüstite , magnetite , stoichiometry , carbon dioxide , eutectic system , decomposition , chemistry , inorganic chemistry , oxygen , partial pressure , materials science , metallurgy , crystallography , organic chemistry , microstructure
Active wustite (FeδO, with a δ value of 0.98) was prepared by keeping normal wustite (δ value of 0.94) in a N 2 atmosphere at 300°C for 10 min. This reaction is given by (4δ 2 –3)Fe δ1 O→(4δ 1 –3)Fe δ2 O + (δ 2 –δ 1 )Fe 3 O 4 where δ 1 = 0.94 and δ 2 = 0.98. The equation indicates that the normal wustite undergoes eutectoid decomposition into active wustite and stoichiometric magnetite (Fe 3 O 4 ). Carbon dioxide (1.013 × 10 5 Pa) was almost completely (100%) decomposed into carbon (zero valence) by the active wustite at the low temperature of 300°C, which was associated with the transformation of the active wustite into the stoichiometric magnetite. The internal pressure of the reaction cell eventually became a vacuum.