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- W2119684705 abstract "Recently the authors suggested that the reaction of neopentane with hydrogen would be a good probe for the activity characterization of supported Pd catalysts; in particular, the selectivity toward isomerization appears to be a good measure of the interaction of Pd with the support. For example, with Pd/SiO{sub 2} and Pd/TiO{sub 2} reduced at higher temperatures, there is a considerable growth in isomerization selectivity compared to lower temperature-reduced materials. However, it is important to distinguish between chemical and topographical effects in such modifications, and the authors have investigated both. Some earlier work with neopentane/H{sub 2} indicated that (111)-oriented Pd films are very selective toward isomerization ({approximately}70% at T {approximately} 275 C), but lose this selectivity after various pretreatments that lead to formation of a defect structure. However, Pd powders do not exhibit this selectivity even after high-temperature reduction. In view of this, and the results presented here, it seems clear that the prior work on Pd(111) was affected by extraneous surface effects, possibly the formation of Pd silicides after annealing in H{sub 2} at 500 C. Still, there appears to be a large effect of morphology of Pd on the neopentane reaction, but little is known about the effect ofmore » particle size, particularly with respect to supported catalysts. In the present study the authors use a well-characterized series of Pd/SiO{sub 2} to look further at this question in a situation where metal-support interactions should be absent.« less" @default.
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- W2119684705 date "1989-10-01" @default.
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- W2119684705 title "Reaction of neopentane with hydrogen over Pd/SiO2" @default.
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- W2119684705 doi "https://doi.org/10.1016/0021-9517(89)90181-4" @default.
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