Li, Cunshuo and Tang, Bingyue and Ogunbiyi, Ajibola T and Tang, Songquan and Li, Wenzhi and Lu, Qiang and Yuan, Liang (2020) The effects of facet-dependent palladium-titania interactions on the activity of Pd/Rutile catalysts for lean methane oxidation. Molecular Catalysis, 528.
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Abstract
Rod-shaped rutile materials with different proportions of (110) and (111) facets exposed were hydrothermally prepared, and the facet-dependent effects of rutile on the activity of supported palladium phases in lean methane oxidation were elucidated. Although a stronger interaction between palladium and the rutile (111) facet was confirmed by systematic characterizations, performance evaluation and in situ DRIFTS revealed deteriorated catalytic efficiencies of palladium catalysts. Specifically, while complete methane oxidation was achieved at temperature below 450 ◦C over a Pd/Rutile-(110) catalyst, only 39% of methane were eliminated at 500 ◦C over its counterpart supported on Rutile-(111). Investigations on rutile supported palladium catalysts further revealed that the facet-dependent palladium-titania interactions profoundly affected the particle sizes and chemical states of the deposited palladium species. In combination with DFT calculations, it was then found that Pd4+ species that might function synergistically with Pd2+ in methane activation were not as stable on the rutile (111) facet, due to the strong electron transfer from this substrate. It is hoped that the conclusions drawn in this work would provide supplementary understanding of the facet-dependent metal-TiO2 interactions and some inspirations on the further rutile-related catalyst design.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Pd/Rutile catalysts Facet-dependent effects Lean methane oxidation |
| Subjects: | T Technology > TP Chemical technology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | nwokealisi |
| Date Deposited: | 11 Oct 2023 10:43 |
| Last Modified: | 11 Oct 2023 10:43 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/17370 |
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