Particle Size Effect on CH4 Oxidation Over Noble Metals: Comparison of Pt and Pd Catalysts

Intrinsic catalytic activities (TOF values) in CH 4 complete oxidation under lean conditions were estimated as a function of Pt and Pd particle sizes (d m ) for two series of Pt/Al 2 O 3 and Pd/Al 2 O 3 catalysts. Comparison of TOF ~  f (d m ) relationships revealed significant difference between Pt...

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Bibliographic Details
Published inTopics in catalysis Vol. 56; no. 1-8; pp. 306 - 310
Main Authors Stakheev, A. Yu, Batkin, A. M., Teleguina, N. S., Bragina, G. O., Zaikovsky, V. I., Prosvirin, I. P., Khudorozhkov, A. K., Bukhtiyarov, V. I.
Format Journal Article
LanguageEnglish
Published Boston Springer US 01.05.2013
Subjects
Catalysis
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Original Paper
Pharmacy
Physical Chemistry
Platinum/alumina
Particle size effect
Turnover frequency (TOF)
In situ XPS
Palladium
Methane oxidation
Noble metals
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Summary:Intrinsic catalytic activities (TOF values) in CH 4 complete oxidation under lean conditions were estimated as a function of Pt and Pd particle sizes (d m ) for two series of Pt/Al 2 O 3 and Pd/Al 2 O 3 catalysts. Comparison of TOF ~  f (d m ) relationships revealed significant difference between Pt and Pd catalysts. For Pt catalyst TOF showed tendency to increase by 2–3 times with increasing particle size from 1 to ca 3 nm and remained constant, when Pt particles became larger than 3 nm. On the other hand, for Pd catalyst TOF increased almost linearly when particle size grew from 1 to 20 nm. These different tendencies were attributed to the different mechanisms of CH 4 oxidation over Pt and Pd catalysts: Langmuir–Hinshelwood and Mars-Van Krevelen respectively.
ISSN:1022-5528
1572-9028
DOI:10.1007/s11244-013-9971-y