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Catalytic oxidation of solid carbon and carbon monoxide over cerium‐zirconium mixed oxides
Author(s) -
Yin Kehua,
Davis Robert J.,
Mahamulkar Shilpa,
Jones Christopher W.,
Agrawal Pradeep,
Shibata Hirokazu,
Malek Andrzej
Publication year - 2017
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.15575
Subject(s) - cerium , catalysis , coke , zirconium , carbon monoxide , inorganic chemistry , thermogravimetric analysis , chemistry , oxygen storage , catalytic oxidation , redox , mixed oxide , reaction rate constant , cerium oxide , materials science , chemical engineering , kinetics , metallurgy , organic chemistry , physics , quantum mechanics , engineering
A series of cerium‐zirconium mixed oxides was prepared and evaluated in the catalytic oxidation of solid coke with 10 vol % O 2 in He at 673 K using a thermogravimetric analyzer. The measured first order rate constant for coke oxidation was proportional to the catalyst loading when the mass ratio of catalyst to coke was low, which enabled the calculation of a surface area specific reaction rate. The validity of the normalization method was confirmed by performing CO oxidation over the cerium‐zirconium mixed oxides in a fixed bed reactor at 573 K. Although there was no correlation between the coke oxidation rate and the oxygen storage capacity or the reducibility of the catalysts, there was an excellent correlation to the CO oxidation rate. Kinetic studies of both coke and CO oxidation suggested an important role of surface lattice oxygen from the catalyst in the two reactions. © 2016 American Institute of Chemical Engineers AIChE J , 63: 725–738, 2017