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Kinetic Features of the Deep Oxidation of Propane over a Pt/Fiberglass Catalyst Full article

Общее Language: Английский, Genre: Full article,
Status: Published, Source type: Original
Journal Chemical Engineering Journal
ISSN: 1385-8947 , E-ISSN: 1873-3212
Output data Year: 2018, Volume: 349, Pages: 547-553 Pages count : 7 DOI: 10.1016/j.cej.2018.05.103
Tags Propane oxidation; Kinetics; Platinum clusters; Fiberglass; Langmuir-Hinshelwood
Authors Kovalyov Evgenii V. 1 , Sadovskaya Ekaterina M. 1 , Bal'zhinimaev Bair S. 1
Affiliations
1 Boreskov Institute of Catalysis, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russian Federation

Funding (1)

1 Ministry of Science and Higher Education of the Russian Federation ГЗ-2017-2020

Abstract: A detailed kinetic study on the deep oxidation of propane was carried out in a wide range of temperatures and concentrations using a novel Pt-fiberglass catalyst. Highly dispersed 1–1.5 nm Pt2+-Pt0 metal-oxide clusters are confined in the bulk of glass at a depth up to 20 nm. In spite of extremely low platinum content (0.01–0.02%), this catalyst showed a very high activity in the propane oxidation. The modified Langmuir-Hinshelwood mechanism including reversible adsorption of molecular oxygen and irreversible adsorption of propane and its subsequent combustion by adjacent oxygens was proposed. The simplest kinetic model adequately describing such experimental features like the extremal dependence of the reaction rate on the O2 concentrations, the sharp changes of reaction order with respect to oxygen, the significant growth of apparent activation energy with decreasing the oxygen concentration, etc. was developed. In particular, the extremal dependence is caused by competitive adsorption of propane and oxygen on the different active sites. At high O2 concentrations, the adsorbed oxygen occupies virtually all active sites that are accessible for propane adsorption, and the reaction rate sharply decreases. In the case of oxygen deficiency, the adsorbed propane does not occupy completely the active sites for oxygen adsorption, so that the reaction rate increases with propane concentration. The maximum reaction rate is attained at the defined O2/C3H8 ratios when the concentrations of adsorbed oxygen and propane are comparable.
Cite: Kovalyov E.V. , Sadovskaya E.M. , Bal'zhinimaev B.S.
Kinetic Features of the Deep Oxidation of Propane over a Pt/Fiberglass Catalyst
Chemical Engineering Journal. 2018. V.349. P.547-553. DOI: 10.1016/j.cej.2018.05.103 publication_identifier_short.wos_identifier_type publication_identifier_short.scopus_identifier_type publication_identifier_short.rinz_identifier_type
Dates:
Submitted: Feb 15, 2018
Accepted: May 18, 2018
Published online: May 19, 2018
Published print: Oct 1, 2018
Identifiers:
publication_identifier.wos_identifier_type WOS:000437090400055
publication_identifier.scopus_identifier_type 2-s2.0-85047631791
publication_identifier.rinz_identifier_type 35535551
publication_identifier.accession_number_identifier_type 2018:1025421
publication_identifier.chemical_accession_number_identifier_type 169:64841
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