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Kinetics of o ‐Xylene Combustion over a Pt/Alumina Catalyst
Author(s) -
Manta C. M.,
Bozga G.,
Bercaru G.,
Bîldea C. S.
Publication year - 2012
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201200371
Subject(s) - catalysis , adsorption , chemistry , combustion , catalytic combustion , xylene , kinetics , oxygen , p xylene , reaction rate , inorganic chemistry , chemical engineering , organic chemistry , benzene , physics , quantum mechanics , engineering
o ‐Xylene combustion in air over a Pt/γ‐Al 2 O 3 catalyst was investigated in a laboratory reactor at low concentrations typical for depollution applications. The results evidenced a slightly negative influence of o ‐xylene concentration on combustion rate. A kinetic model of the combustion process was developed by using the Langmuir‐Hinshelwood mechanism, assuming the surface reaction between adsorbed oxygen atoms and adsorbed o ‐xylene molecules as controlling step. The rate expression includes the influences of o ‐xylene and water adsorption on the active centers of the catalyst. The estimation of rate expression parameters is based on o ‐xylene conversion measurements obtained under conditions free of influences of physical steps.