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• W2046361429 abstract "Alternations in the size of the particles on alternate heating in H2 and O2 of model PtAl2O3 catalysts is reported. The catalysts have been investigated by electron microscopy and electron diffraction. The particles appear smaller on heating in oxygen and larger and extended on heating in hydrogen (on heating in hydrogen they regain more or less the size they had prior to the oxygen treatment). This behavior is apparently in contrast to the normally observed extension of particles on oxidation and contraction on reduction. The alternation in size is explained on the basis of the formation of a detectable film (in the form of a halo), or an undetectable film, around each particle due to the strong interactions between crystallites and support in an oxygen atmosphere, and its withdrawal to merge with the respective particle in a hydrogen atmosphere. The films remain in the immediate vicinity of and in contact with the parent particles and do not interconnect with one another to form a contiguous surface film. It is suggested that one of the possible mechanisms of redispersion (regeneration) of PtAl2O3 often observed in oxidizing atmospheres is by extension and film formation." @default.
• W2046361429 created "2016-06-24" @default.
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• W2046361429 date "1987-11-01" @default.
• W2046361429 modified "2023-10-14" @default.
• W2046361429 title "Redispersion of Pt/alumina via film formation" @default.
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• W2046361429 doi "https://doi.org/10.1016/0021-9517(87)90157-6" @default.
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