Synergistic Effect of Simultaneous Doping of Ceria Nanorods with Cu and Cr on CO Oxidation and NO Reduction
| Autor: | Bruno Pinho, Salvador Eslava, Laura Torrente-Murciano, Oriol Pastor‐Algaba, Shawn Rood, Albert Tosca‐Princep, Mark A. Isaacs |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Chemistry
Multidisciplinary Inorganic chemistry chemistry.chemical_element Crystal structure NANOSTRUCTURED CERIA 010402 general chemistry 01 natural sciences Catalysis COOX/CEO2 CATALYSTS RAMAN-SPECTROSCOPY X-ray photoelectron spectroscopy TRANSITION-METAL Hydrothermal synthesis CARBON-MONOXIDE NO reduction Science & Technology Dopant Full Paper 010405 organic chemistry Chemistry Organic Chemistry Doping MIXED OXIDES General Chemistry Cerium OXYGEN VACANCY FORMATION Full Papers CO oxidation CONTAINING CEO2 NANOPOLYHEDRA 0104 chemical sciences cerium CATALYTIC PERFORMANCE Hydrothermal Synthesis PHYSICOCHEMICAL PROPERTIES Physical Sciences Nanorod Nanorods 03 Chemical Sciences nanorods |
| Zdroj: | Chemistry (Weinheim an Der Bergstrasse, Germany) Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona |
| Popis: | Ceria particles play a key role in catalytic applications such as automotive three‐way catalytic systems in which toxic CO and NO are oxidized and reduced to safe CO2 and N2, respectively. In this work, we explore the incorporation of Cu and Cr metals as dopants in the crystal structure of ceria nanorods prepared by a single‐step hydrothermal synthesis. XRD, Raman and XPS confirm the incorporation of Cu and Cr in the ceria crystal lattices, offering ceria nanorods with a higher concentration of oxygen vacancies. XPS also confirms the presence of Cr and Cu surface species. H2‐TPR and XPS analysis show that the simultaneous Cu and Cr co‐doping results in a catalyst with a higher surface Cu concentration and a much‐enhanced surface reducibility, in comparison with either undoped or singly doped (Cu or Cr) ceria nanorods. While single Cu doping enhances catalytic CO oxidation and Cr doping improves catalytic NO reduction, co‐doping with both Cu and Cr enhances the benefits of both dopants in a synergistic manner employing roughly a quarter of dopant weight. Doped up for detox: Ceria particles play a key role in catalytic applications such as automotive three‐way catalytic systems in which toxic CO and NO are respectively oxidized and reduced to safe CO2 and N2. We explored the incorporation of Cu and Cr metals as dopants in the crystal structure of ceria nanorods prepared by a single‐step hydrothermal synthesis. Such co‐doped ceria nanorods show synergistic improvement in reducibility and enhanced performance for CO oxidation and NO reduction. |
| Databáze: | OpenAIRE |
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