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Gas‐solid reactions II: Reduction of cobalt sulfide in the presence of calcium oxide
Author(s) -
Fahim M. A.,
Ford J. D.
Publication year - 1978
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.5450560613
Subject(s) - calcium oxide , hydrogen sulfide , hydrogen , cobalt , pellet , oxide , materials science , chemistry , solid oxide fuel cell , cobalt sulfide , inorganic chemistry , calcium , solid solution , grain size , analytical chemistry (journal) , mineralogy , chemical engineering , metallurgy , composite material , chromatography , sulfur , organic chemistry , electrode , electrochemistry , anode , engineering
The results of an experimental program to test the applicability of the grain‐cell model to complex gas‐solid reactions are presented. The hydrogen reduction of solid cobalt sulfide (CO 9/8 S) in the presence of calcium oxide was chosen for study. Powders of both solids were mixed in a molar ratio of 3.0 (CaO:Co 9/8 S), compressed into pellet form, then reduced by hydrogen in the temperature range 600‐800°C. The experimental results at different operating conditions were compared with the grain‐cell model, using the Thiele type modulus (H) as an adjustable parameter. In the presence of excess calcium oxide, the structural‐kinetic parameter (γ) was essentially zero, and (H) was found to be the effective parameter, controlling reduction rates. Good agreement between experimental results and model was obtained.