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- W1551014819 abstract "We have developed the impregnation strategy of “strong electrostatic adsorption” (SEA) which can yield ultra-small metal particles with a simple impregnation process. The key is to perform the impregnation at the pH which maximizes electrostatic interactions between the substrate and the adsorbing metal complex. The overarching hypothesis of the SEA approach is that the high dispersion of strongly adsorbed precursors can be retained as the metal is reduced. The steps of the SEA approach for any particular metal/support system are a) the measurement of support PZC (which determines the type of metal ion and pH range to employ), b) uptake – pH surveys to determine the pH of strongest interaction, and c) after adsorbing the metal complex at the optimal final pH, tuning the reduction treatment to preserve high dispersion. This approach can be employed at low or high pH over many supports, utilizing common catalyst precursors. The production of small particles by SEA will be demonstrated for cationic metal (Pt, Cu, Ru, Co, etc.) ammines on silica, anionic metal chlorides on alumina, and both types of precursors on carbon. The electrostatic mechanism will also be demonstrated for the selective partitioning of a metal onto a mixed oxide surface, such as a promoted or bound catalyst support, and for the production of bimetallics particles when one metal can exist as an oxide in a preliminary state." @default.
- W1551014819 created "2016-06-24" @default.
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- W1551014819 date "2006-01-01" @default.
- W1551014819 modified "2023-09-26" @default.
- W1551014819 title "Simple, Scientific Syntheses with Common Catalyst Precursors" @default.
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- W1551014819 doi "https://doi.org/10.1016/s0167-2991(06)80909-2" @default.
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