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In situ gravimetric studies of the regenerative mechanism for water‐gas shift over magnetite: Equilibrium and kinetic measurements in CO 2 /CO and H 2 O/H 2 gas mixtures
Author(s) -
Kubsh J. E.,
Dumesic J. A.
Publication year - 1982
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690280514
Subject(s) - gravimetric analysis , chemistry , magnetite , chromia , water gas shift reaction , oxygen , kinetic energy , water gas , partial pressure , analytical chemistry (journal) , in situ , inorganic chemistry , catalysis , environmental chemistry , materials science , metallurgy , syngas , organic chemistry , physics , quantum mechanics
In situ gravimetric measurements were used to study oxygen removal from (or incorporation into) chromia‐promoted magnetite in CO 2 /CO and H 2 O/H 2 gas mixtures at 637 K. The equilibrium and kinetic data could be described by two reversible, oxidation‐reduction reactions: surface‐oxygen removal by CO and surface oxygen replenishment by H 2 O, with the corresponding reverse reaction involving CO 2 and H 2 . These reactions form a regenerative mechanism that is able to predict qualitatively both the measured rate and rate expression for water‐gas shift. It is concluded that this regenerative mechanism is a primary pathway for water‐gas shift over magnetite.