Palla

Palladium was named after the asteroid Pallas, which was discovered at about the same time. Pallas was the Greek goddess of wisdom. 

In 1803, in the course of his study of platinum, Wollaston isolated and identified palladium from the mother liquor remaining after platinum had been precipitated as (NH4)2PtCl6 from its solution in aqua regia. He named it after the newly discovered asteroid, Pallas, itself named after the Greek goddess of wisdom (ytaXXd iov, palladion, of Pallas). 

In the vapor-phase process, oxyacylation of ethylene is carried out in a tubular reactor at approximately 117°C and 5 atmospheres. The palla-... 

Letunov, V. N., and Vysotski, E. S. (1988). Bioluminescence activity and content of calcium-dependent photoprotein in Obelia longissima (Pallas) hydroid colonies. Zh. Obshch. Biol. 49 381-387. 

Palladium and platinum are the longest known and most studied of the six platinum metals [1-11], a reflection of their abundance and consequent availability. Platinum occurs naturally as the element, generally with small amounts of the other platinum metals. It was used as a silver substitute by Colombian Indians and first observed there by Ulloa (1736), who called it platina del Pinto ( little silver of the Pinto river ) but the first sample was actually brought to Europe in 1741 by Charles Wood, Assay Master of Jamaica. Palladium was isolated in 1803 by W.H. Wollaston, who was studying the aqua regia-soluble portion of platinum ores (he announced his discovery by an anonymous leaflet advertising its sale through a shop in Soho) and named it after the newly discovered asteroid Pallas [12],... 

Quite a contrasting effect was found for the solvolysis of sterically hindered palla-dium(II) complexes of the ligand Et2NCH2CH2NHCH2CH2NEt2 (= Et4dien).16 The reactions, with X = halide or pseudohalide, are... 

Durch Reduktion von Halogen-aromaten mit Natrium-tetradeuterido-borat/Palla-dium(II)-chlorid in Methanol-O-D konnen deuterierte Aromaten hergestellt werden. Der Deuterium-Gehalt der letzteren ist hoher als 95% ... 

Iris setosa Pallas occurs widely in subarctic parts of the Northern Hemisphere. Several varieties of I. setosa have been recognized over the years var. canadensis M. Foster (syn. /. hookeri Penny) in the Canadian north, and vars. setosa, nasuensis... 

Figure 7. CO transient response curves (MW=12) obtained from a typical pump-probe experiment with the palla um-based catalysts and 1,2 C-ethylene.

Pt/Pd bimetallic nanoparticles can be prepared by refluxing the alcohol/water (1 1, v/v) solution of palla-dium(II) chloride and hexachloroplatinic(IV) acid in the presence of poly(A-vinyl-2-pyrrolidone) (PVP) at ca. 95 °C for Ih [15,16,48]. The resulting Pd/Pt nanoparticles have a Pt-core/Pd-shell structure with a narrow size distribution and the dispersion is stable against aggregation for several years. The core/shell structure was confirmed by the technique of EAXFS. Composition of Pt/Pd nanoparticles can be controlled by the initially feed amount of two different metal ions, i.e., in this case one... 

Allegedly, the product of the reduction is a bipyridyl palla-dium(0) complex. This is not likely and our personal opinion is that the obtained material is a supported metal palladium catalyst. This is the reason why the paper was included in this review. 

FIGURE 2.6 Wet deposition of THg over a south to north gradient in Sweden and Finland. Vavihill (southernmost) and Pallas (northernmost). Data are shown for 6 years. 

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