Kinetics of the CH4/O2 reaction over supported palladium catalysts on K-doped manganite perovskite: Impact of potassium on the nature of Pd-support interface and related reaction mechanisms.
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| Title: | Kinetics of the CH4/O2 reaction over supported palladium catalysts on K-doped manganite perovskite: Impact of potassium on the nature of Pd-support interface and related reaction mechanisms. |
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| Authors: | Zheng, Yuanshuang1 (AUTHOR), Granger, Pascal1 (AUTHOR) pascal.granger@univ-lille.fr |
| Source: | Applied Surface Science. Oct2024, Vol. 670, pN.PAG-N.PAG. 1p. |
| Subjects: | Palladium catalysts, Lean combustion, Chemical kinetics, Surface analysis, Combustion kinetics, Manganite, Perovskite |
| Abstract: | [Display omitted] • Competition between chemisorbed O species and surface lattice oxygen species as active oxygen species in methane activation. • K-doping suppresses the reactivity of surface lattice O species in C–H bond scission. • Competition between single site and dual sites reaction mechanisms strongly perturbated by thermal aging. • Detrimental effect of K-doping of methane combustion due to the growth of K 1.4 Mn 3 O 6. The kinetics of the CH 4 /O 2 reaction, occurring on post-combustion catalysts to treat the exhaust gases of natural gas-powered engines, has been investigated in lean conditions on model Pd catalysts supported on K-doped LaMnO 3. Experimental and predicted reaction rates have been compared according to a single site on Pd active sites and dual site reaction mechanism on active sites located at the Pd-perovskite interface. Comparisons with a benchmark Pd/LaMnO 3 emphasized significant changes induced by thermal aging at 750 °C in wet atmosphere (10 vol% H 2 O in 5 vol% O 2). Indeed, the contribution of the single site mechanism grows on aged Pd/LaMnO 3 emphasizing a deterioration of the Pd-LaMnO 3 interface. The opposite trend is observed on Pd/La 1− x K x MnO 3 with kinetics obeying to a single site mechanism on pre-reduced catalyst and then shifting to a quasi-exclusive dual site mechanism after aging. Such kinetic features have been discussed with respect to bulk and surface physicochemical characterization pointing out the key role of potassium in the stability of the Pd-support interface. [ABSTRACT FROM AUTHOR] |
| Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 178600470 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Kinetics of the CH4/O2 reaction over supported palladium catalysts on K-doped manganite perovskite: Impact of potassium on the nature of Pd-support interface and related reaction mechanisms. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zheng%2C+Yuanshuang%22">Zheng, Yuanshuang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Granger%2C+Pascal%22">Granger, Pascal</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> pascal.granger@univ-lille.fr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Applied+Surface+Science%22">Applied Surface Science</searchLink>. Oct2024, Vol. 670, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Palladium+catalysts%22">Palladium catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Lean+combustion%22">Lean combustion</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+analysis%22">Surface analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Combustion+kinetics%22">Combustion kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Manganite%22">Manganite</searchLink><br /><searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: [Display omitted] • Competition between chemisorbed O species and surface lattice oxygen species as active oxygen species in methane activation. • K-doping suppresses the reactivity of surface lattice O species in C–H bond scission. • Competition between single site and dual sites reaction mechanisms strongly perturbated by thermal aging. • Detrimental effect of K-doping of methane combustion due to the growth of K 1.4 Mn 3 O 6. The kinetics of the CH 4 /O 2 reaction, occurring on post-combustion catalysts to treat the exhaust gases of natural gas-powered engines, has been investigated in lean conditions on model Pd catalysts supported on K-doped LaMnO 3. Experimental and predicted reaction rates have been compared according to a single site on Pd active sites and dual site reaction mechanism on active sites located at the Pd-perovskite interface. Comparisons with a benchmark Pd/LaMnO 3 emphasized significant changes induced by thermal aging at 750 °C in wet atmosphere (10 vol% H 2 O in 5 vol% O 2). Indeed, the contribution of the single site mechanism grows on aged Pd/LaMnO 3 emphasizing a deterioration of the Pd-LaMnO 3 interface. The opposite trend is observed on Pd/La 1− x K x MnO 3 with kinetics obeying to a single site mechanism on pre-reduced catalyst and then shifting to a quasi-exclusive dual site mechanism after aging. Such kinetic features have been discussed with respect to bulk and surface physicochemical characterization pointing out the key role of potassium in the stability of the Pd-support interface. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.apsusc.2024.160695 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Palladium catalysts Type: general – SubjectFull: Lean combustion Type: general – SubjectFull: Chemical kinetics Type: general – SubjectFull: Surface analysis Type: general – SubjectFull: Combustion kinetics Type: general – SubjectFull: Manganite Type: general – SubjectFull: Perovskite Type: general Titles: – TitleFull: Kinetics of the CH4/O2 reaction over supported palladium catalysts on K-doped manganite perovskite: Impact of potassium on the nature of Pd-support interface and related reaction mechanisms. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zheng, Yuanshuang – PersonEntity: Name: NameFull: Granger, Pascal IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 10 Text: Oct2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 01694332 Numbering: – Type: volume Value: 670 Titles: – TitleFull: Applied Surface Science Type: main |
| ResultId | 1 |
