Unveiling Key Factors Governing the Activity of Pd/TiO₂ Catalysts in the Low-Temperature Reverse Water–Gas Shift Reaction
In this study, Pd/TiO2 catalysts were prepared using different methods (impregnation (IMP), chemical reduction (CR), and deposition–precipitation (DP)) to evaluate the effects of metal dispersion and metal-support interfacial sites on the activity for the reverse water–gas shift (rWGS) reaction (CO2...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:dnet:digitalcsic_::aa4435eb8318f080e413528afad73d1d |
| Acceso en línea: | http://hdl.handle.net/10261/429943 https://www.scopus.com/pages/publications/105007712370?origin=resultslist |
| Access Level: | acceso abierto |
| Palabra clave: | Anatase CO<sub>2</sub> hydrogenation Pd/TiO<sub>2</sub> Reverse water–gas shift reaction |
| Sumario: | In this study, Pd/TiO2 catalysts were prepared using different methods (impregnation (IMP), chemical reduction (CR), and deposition–precipitation (DP)) to evaluate the effects of metal dispersion and metal-support interfacial sites on the activity for the reverse water–gas shift (rWGS) reaction (CO2 + H2 ↔ CO + H2O) under low-temperature and high-pressure conditions. Under challenging low-temperature reaction conditions, the highest CO yield (711.2 mmolCO·min−1·molPd−1) was achieved with the Pd/TiO2 catalyst prepared via deposition–precipitation method. Characterization results revealed that this method exhibited the best surface exposure of metallic Pd particles and altered the support morphology by decorating the TiO2 and Pd surfaces with amorphous TiO2 particles. The structure–activity correlation indicated that the key factors influencing catalyst activity and selectivity were: surface exposure and particle size of metallic Pd (from XPS, XRD, and HRTEM), the development of Pd–TiO2 interfacial region (from XPS and DRIFTS-CO), and surface hydroxylation (from DRIFTS-OH). The Pd-PD catalysts with moderate SMSI seem to develop an optimal interaction that leads to better selectivity toward CO with respect to methanation. © 2025 The Author(s). ChemCatChem published by Wiley-VCH GmbH. |
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