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- W2013580686 abstract "By the reduction of π-allyl compounds of palladium such as [Pd-Cl(C3H5)]2, [Pd(C3H5)(C5H5)] and [Pd2(C3H5)(C5H5)(PPh3)2] by sodium borohydride and hydrazine hydrate, a new type of catalysts has been synthesized in which the Pd black serves as a support on whose surface palladium complexes, stabilized by organic ligands, are fixed. The chemical and phase compositions of the catalysts have been determined. In the presence of organometallic compounds, a highly dispersed metal phase is formed having a narrow particle size distribution. A mechanism for the formation of Pd blacks from the organometallic compounds is proposed, whereby such blacks form via the emergence of pre-crystalline associates of reduced palladium whose structures are subsequently ordered after hydrogen treatment. It is found that, besides metallic palladium, the catalyst surfaces also contain additional active centres associated with electron-deficient palladium. The activity and selectivity of such blacks in the liquid-phase hydrogenation of organic compounds increase with increasing dispersion of the catalyst and with their fixed complex content. A model is suggested for the structure of Pd blacks generated from organometallic compounds." @default.
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- W2013580686 date "1989-11-01" @default.
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- W2013580686 title "Heterogenized metal complex catalysts based on Pd black" @default.
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- W2013580686 doi "https://doi.org/10.1016/0304-5102(89)80255-x" @default.
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