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PALLADIUM-ALUMINA CATALYSTS - A DIFFUSE REFLECTANCE STUDY
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| 其它 | Palladium catalysts are prepared from various precursors (chloride, nitrate, acetylacetonate) by using different methods of precursor bonding on 2 types of alumina. The chemical state and environment of Pd is studied by UV-visible diffuse reflectance spectroscopy along the successive preparation stages. The species formed upon interaction of precursors with the carriers are identified and their transformations upon calcination and reduction are studied. The reactivity of oxide "clusters' towards NH3 is used as a criterion of their dispersion. A tentative correlation is presented between the nature of intermediate Pd entities and the dispersion of the metallic phase obtained after reduction by hydrogen. Ionic palladium is detected on catalysts ex PdCl2 even after reduction at high temperature. |
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(2025-6-4)