Characterization and catalytic properties of CuO/CeO 2 /MgAl 2 O 4 for preferential oxidation of CO in H 2 -rich streams
| Autor: | Laura Pascual, Abdelhakim Elmhamdi, Anna Kubacka, Kais Nahdi, Arturo Martínez-Arias, Rafael Castañeda |
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| Rok vydání: | 2016 |
| Předmět: |
Hydrogen
Chemistry Process Chemistry and Technology Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Copper Catalysis 0104 chemical sciences law.invention Characterization (materials science) X-ray photoelectron spectroscopy law 0210 nano-technology Electron paramagnetic resonance General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 188:292-304 |
| ISSN: | 0926-3373 |
| Popis: | Catalysts of copper (1 wt.%) supported on a CeO2/MgAl2O4 mixed support have been prepared by using different pH values (pH ∼ 4, 8 and 10) in the impregnating solution of copper with the aim of favoring different situations of interaction between copper and the two support components. The catalysts have been characterized in detail by XRD, SBET measurement, HREM and associated techniques, XPS, H2-TPR and EPR which allows establishing a model of structural characteristics of the catalysts. The characterization results have been correlated with analysis of the catalytic properties of the samples for preferential oxidation of CO in a H2-rich stream (CO-PROX) complemented by operando-DRIFTS. Important structural/chemical/catalytic differences as a function of the pH of the impregnating solution are revealed. These are explained on the basis of the characteristics of the interfaces formed between the different components present in each catalyst which basically determine the catalytic properties in each case. |
| Databáze: | OpenAIRE |
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