Kinetic Features of the Deep Oxidation of Propane over a Pt/Fiberglass Catalyst Full article
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Chemical Engineering Journal
ISSN: 1385-8947 , E-ISSN: 1873-3212 |
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| 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 |
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| Affiliations |
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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 WOS Scopus РИНЦ ANCAN OpenAlex
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 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Feb 15, 2018 |
| Accepted: | May 18, 2018 |
| Published online: | May 19, 2018 |
| Published print: | Oct 1, 2018 |
Identifiers:
| Web of science: | WOS:000437090400055 |
| Scopus: | 2-s2.0-85047631791 |
| Elibrary: | 35535551 |
| Chemical Abstracts: | 2018:1025421 |
| Chemical Abstracts (print): | 169:64841 |
| OpenAlex: | W2803575187 |