Abnormally Narrow Peaks in TPR-H2 over Pt/CeO2: Experiment and Mathematical Modelling Full article
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International Journal of Hydrogen Energy
ISSN: 0360-3199 , E-ISSN: 1879-3487 |
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| Output data | Year: 2024, Volume: 89, Pages: 590-604 Pages count : 15 DOI: 10.1016/j.ijhydene.2024.09.253 | ||
| Tags | H2 consumption, Pt/CeO2, Abnormally narrow peaks, Autocatalysis, Mathematical modelling | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | FWUR-2024-0032 |
Abstract:
The application and development of methods using hydrogen as a gas for testing active surface sites is of great interest in the study of oxide catalysts. In this work a systematic study of Pt/CeO2 catalysts, depending on the platinum loading and calcination temperature was carried out using the method of temperature-programmed reduction by hydrogen (TPR-H2). Experimental TPR-H2 curves demonstrated a complex structure over a wide temperature range, including the presence of abnormally narrow consumption peaks (ANCP-H2) at low temperatures. To describe the kinetics, mathematical modeling of H2 consumption by various platinum active centers has been used, including isolated platinum ions (single atoms) and PtOx clusters of 2D and 3D structures on the surface of ceria nanoparticles. We proposed a criterion that makes it possible to extend the analysis of the TPR-H2 curves for reducible metal-supported oxide systems and unambiguously establish the action of the autocatalytic mechanism in hydrogen consumption. The kinetics of ANCP-H2 by cluster PtOx centers with a halfwidth of several degrees on the base of the autocatalysis mechanism was described on the base of the proposed model. The simulations show that ANCP-H2 are described by synchronous fast formation of metallic centers that provide a sharp acceleration of H2 consumption. In general, the obtained results establish the fundamental aspects of the H2 interaction with heterogeneous catalysts and are of particular interest in the light of various practical applications of hydrogen energy.
Cite:
Lashina E.A.
, Slavinskaya E.M.
, Stonkus O.A.
, Boronin A.I.
Abnormally Narrow Peaks in TPR-H2 over Pt/CeO2: Experiment and Mathematical Modelling
International Journal of Hydrogen Energy. 2024. V.89. P.590-604. DOI: 10.1016/j.ijhydene.2024.09.253 WOS Scopus AN OpenAlex
Abnormally Narrow Peaks in TPR-H2 over Pt/CeO2: Experiment and Mathematical Modelling
International Journal of Hydrogen Energy. 2024. V.89. P.590-604. DOI: 10.1016/j.ijhydene.2024.09.253 WOS Scopus AN OpenAlex
Dates:
| Submitted: | Jun 24, 2024 |
| Accepted: | Sep 18, 2024 |
| Published online: | Sep 30, 2024 |
| Published print: | Nov 4, 2024 |
Identifiers:
| Web of science: | WOS:001329366400001 |
| Scopus: | 2-s2.0-85205148216 |
| Chemical Abstracts: | 2024:2113490 |
| OpenAlex: | W4402976293 |