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    Wollaston published the discovery of rhodium in and mentions some of his work on palladium. It was named by Wollaston in after the asteroid 2 Pallas , which had been discovered two months earlier.

    He added mercuric cyanide to form the compound palladium II cyanide , which was heated to extract palladium metal. Palladium chloride was at one time prescribed as a tuberculosis treatment at the rate of 0.

    This treatment had many negative side-effects , and was later replaced by more effective drugs. Most palladium is used for catalytic converters in the automobile industry.

    As overall mine production of palladium reached , kilograms in , Russia was the top producer with 82, kilograms, followed by South Africa, Canada and the U.

    Palladium can be found as a free metal alloyed with gold and other platinum-group metals in placer deposits of the Ural Mountains , Australia , Ethiopia , North and South America.

    For the production of palladium, these deposits play only a minor role. The most important commercial sources are nickel - copper deposits found in the Sudbury Basin , Ontario , and the Norilsk—Talnakh deposits in Siberia.

    Palladium is also produced in nuclear fission reactors and can be extracted from spent nuclear fuel see synthesis of precious metals , though this source for palladium is not used.

    None of the existing nuclear reprocessing facilities are equipped to extract palladium from the high-level radioactive waste.

    The largest use of palladium today is in catalytic converters. Palladium is one of only four metals to have such codes, the others being gold , silver and platinum.

    When it is finely divided, as with palladium on carbon , palladium forms a versatile catalyst ; it speeds heterogeneous catalytic processes like hydrogenation , dehydrogenation , and petroleum cracking.

    Palladium is also essential to the Lindlar catalyst , also called Lindlar's Palladium. For example:. See palladium compounds and palladium-catalyzed coupling reactions.

    When dispersed on conductive materials, palladium is an excellent electrocatalyst for oxidation of primary alcohols in alkaline media.

    In the Nobel Prize in Chemistry was awarded "for palladium-catalyzed cross couplings in organic synthesis" to Richard F.

    Heck , Ei-ichi Negishi and Akira Suzuki. A study showed that palladium is an effective catalyst for carbon-fluorine bonds.

    Palladium catalysis is primarily employed in organic chemistry and industrial applications, although its use is growing as a tool for synthetic biology ; in , effective in vivo catalytic activity of palladium nanoparticles was demonstrated in mammals to treat disease.

    The second greatest application of palladium in electronics is in multi-layer ceramic capacitors [56] in which palladium and palladium-silver alloy is used for electrodes.

    The electronic sector consumed 1. Hydrogen easily diffuses through heated palladium, [4] and membrane reactors with Pd membranes are used in the production of high purity hydrogen.

    Palladium II chloride readily catalyzes carbon monoxide gas to carbon dioxide and is useful in carbon monoxide detectors. Palladium readily adsorbs hydrogen at room temperatures, forming palladium hydride PdH x with x less than 1.

    At any higher ratio, the solid solution becomes diamagnetic. Palladium is used in small amounts about 0.

    Palladium has been used as a precious metal in jewelry since as an alternative to platinum in the alloys called " white gold ", where the naturally white color of palladium does not require rhodium plating.

    Palladium is much less dense than platinum. Prior to , the principal use of palladium in jewelry was the manufacture of white gold.

    Palladium is one of the three most popular alloying metals in white gold nickel and silver can also be used. When platinum became a strategic resource during World War II, many jewelry bands were made out of palladium.

    Palladium was little used in jewelry because of the technical difficulty of casting. With the casting problem resolved [ citation needed ] the use of palladium in jewelry increased, originally because platinum increased in price while the price of palladium decreased.

    Subsequent changes in the relative price of platinum lowered demand for palladium to In January , hallmarks for palladium were introduced by assay offices in the United Kingdom, and hallmarking became mandatory for all jewelry advertising pure or alloyed palladium.

    Articles can be marked as , , or parts of palladium per thousand of the alloy. Fountain pen nibs made from gold are sometimes plated with palladium when a silver rather than gold appearance is desired.

    Sheaffer has used palladium plating for decades, either as an accent on otherwise gold nibs or covering the gold completely. In the platinotype printing process, photographers make fine-art black-and-white prints using platinum or palladium salts.

    Often used with platinum, palladium provides an alternative to silver. Palladium is a metal with low toxicity as conventionally measured e.

    LD Recent research on the mechanism of palladium toxicity suggests high toxicity if measured on a longer timeframe and at the cellular level in the liver and kidney.

    Until that recent work, it had been thought that palladium was poorly absorbed by the human body when ingested. Plants such as the water hyacinth are killed by low levels of palladium salts, but most other plants tolerate it, although tests show that, at levels above 0.

    High doses of palladium could be poisonous; tests on rodents suggest it may be carcinogenic , though until the recent research cited above, no clear evidence indicated that the element harms humans.

    Like other platinum-group metals , bulk Pd is quite inert. Although contact dermatitis has been reported, data on the effects are limited.

    It has been shown that people with an allergic reaction to palladium also react to nickel, making it advisable to avoid the use of dental alloys containing palladium on those so allergic.

    Some palladium is emitted with the exhaust gases of cars with catalytic converters. People working with palladium or its compounds might have a considerably greater uptake.

    From Wikipedia, the free encyclopedia. This article is about the chemical element. For other uses, see Palladium disambiguation. Chemical element with atomic number Main article: Isotopes of palladium.

    See also: Category:Palladium compounds. Main article: Palladium hydride. GHS hazard statements. GHS precautionary statements.

    Pure and Applied Chemistry. Handbook of Chemistry and Physics 81st ed. CRC press. Strizker, Phys.

    Retrieved 12 November Archived from the original PDF on 6 May Geochimica et Cosmochimica Acta. Bibcode : GeCoA.. Organic Syntheses.

    Inorganic Syntheses. A; Vorob'eva, E. G; Dvornikova, I. A; Kuchin, A. V Russian Journal of Coordination Chemistry. Tetrakis triphenylphosphine palladium 0.

    The Organometallic Chemistry of the Transition Metals. John Wiley and Sons. Topics in Organometallic Chemistry. Bibcode : Sci H Angewandte Chemie International Ed.

    In English. C; Kinsinger, C. R; Kormos, B. L; Thompson, J. D; Cramer, C. J Angewandte Chemie International Edition. Annals of Science.

    Platinum Metals Review. Archived from the original on 4 July Retrieved 24 March Philosophical Transactions of the Royal Society of London. International Journal of Hygiene and Environmental Health.

    The London Bullion Market Association. Retrieved 2 October Retrieved 27 January BBC News. Retrieved 19 September Mineral Commodity Summaries.

    C , , 6 , View Author Information. Cite this: J. C , , 6 , — Article Views Altmetric -. Citations Supporting Information. Cited By. This article is cited by 46 publications.

    The Journal of Physical Chemistry C , 32 , Vukmirovic, Radoslav R. Adzic, Kotaro Sasaki. ACS Catalysis , 10 7 , Senanayake, Carlos R.

    Suib, Yusuke Yamauchi, Ben Liu. ACS Nano , 13 10 , Chemistry of Materials , 31 15 , Journal of the American Chemical Society , 8 , The Journal of Physical Chemistry Letters , 9 4 , Chemistry of Materials , 29 23 , Graphdiyne-templated palladium-nanoparticle assembly as a robust oxygen generator to attenuate tumor hypoxia.

    Nano Today , 34 , Advanced Functional Materials , , Supriya, Guddekoppa S. Ananthnag, Vijayendra S. Shetti, B. Nagaraja, Gurumurthy Hegde. Novel g-C3N4 assisted metal organic frameworks derived high efficiency oxygen reduction catalyst in microbial fuel cells.

    Journal of Power Sources , , Shiva Kumar, V. Boron-Doped Carbon nanoparticles supported palladium as an efficient hydrogen evolution electrode in PEM water electrolysis.

    Renewable Energy , , Electrocatalysis , 11 1 , Planar polymer electrolyte membrane fuel cells: powering portable devices from hydrogen.

    Chinese Journal of Catalysis , 40 12 , Sub-5 nm palladium nanoparticles in situ embedded in N-doped carbon nanoframes: facile synthesis, excellent sinter resistance and electrocatalytic properties.

    Journal of Materials Chemistry A , 7 46 , Mesoporous palladium—boron alloy nanospheres. Journal of Materials Chemistry A , 7 43 , Carbon-caged palladium catalysts supported on carbon nanofibers for proton exchange membrane fuel cells.

    Journal of Industrial and Engineering Chemistry , 79 , ChemElectroChem , 6 20 , International Journal of Energy Research , 43 12 , Suppressing the Pd-C interaction through B-doping for highly efficient oxygen reduction.

    Carbon , , Bach, M.

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