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• W2004426067 abstract "Iron, being the most reactive of the group VIII metals, has been chosen to examine the role of strong chemical interactions between gas, crystallite, and substrate in the behavior of supported metal crystallites. Model catalysts of iron deposited by vacuum evaporation onto thin films of alumina have been heated in ultrahigh pure hydrogen (which, however, contains traces of O2 and moisture), in additionally purified hydrogen (to eliminate or minimize the above impurities), in oxygen, and alternately in H2 and O2. Transmission electron micrographs provide information on the behavior and shape of the crystallites and electron diffraction provides information on the chemical compounds formed. It is shown that iron oxide which forms even in hydrogen containing traces of oxygen and/or moisture undergoes strong chemical interaction with alumina to form solid solutions or/and stoichiometric aluminates. Such chemical interactions lead to enhanced surface spreading phenomena and to unusual shapes of the crystallites. The role of strong chemical interactions in the wetting behavior of the crystallites is examined in some detail. It is suggested that because of these interactions the interfacial tension between crystallite and substrate can be decreased enormously (it may even become negative under nonequilibrium conditions). This then leads to a rapid spreading of the crystallite over the substrate, to torus formation, and/or fragmentation of the crystallite. At high temperatures, the smaller crystallites spread completely over the substrate and, as inferred from the electron micrographs, a multilayer film appears to coexist with the crystallites. A variety of mechanisms of sintering could be identified, such as migration and coalescence (even crystallites over 400 Å in size were observed to migrate occasionally), direct ripening, and Ostwald ripening. However, the micrographs indicate that these processes, as well as redispersion, are not simple, but parts of complex surface phenomena involving chemical interactions, wetting, shape changes, splitting etc." @default.
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• W2004426067 date "1985-07-01" @default.
• W2004426067 modified "2023-10-11" @default.
• W2004426067 title "Role of physical and chemical interactions in the behavior of supported metal catalysts: Iron on alumina—A case study" @default.
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• W2004426067 doi "https://doi.org/10.1016/0021-9517(85)90100-9" @default.
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