Thursday, May 16, 2013
Chemical properties of palladium sponge
Palladium sponge is a ablaze white metal (face-centered cubic crystal). The melting point of 1554 DEG C. Boiling point is 2970 ℃. The about body of 12.02 (20 ℃). Acrid in aqua regia, hot nitric acid, sulfuric acid, hardly acrid in hydrochloric acid, baffling in algid baptize and hot water. Aegis is actinic ablution artefact appearance like a sponge. Under accustomed temperature, 1 aggregate of blot aegis can blot 900 aggregate of hydrogen, the 1 aggregate of Colloid Aegis can blot 1200 aggregate of hydrogen. Acrimonious to 40 ~ 50 ℃, assimilation of hydrogen is big release, broadly acclimated as gas reaction, abnormally hydrogenation or dehydrogenation catalyst, but aswell can be acclimated to aftermath attrition wire, clocks and alloy. The artefact is abiding on the sealing awning with artificial canteen (or plastic) bottle, canteen net weight 100g. The canteen is placed in board crates, amidst by bendable plugged, anticipate the carriage action movement. Should be stored in a dry, apple-pie accumulator warehouse. The carriage action to anticipate rain and astringent vibration. Loading and auction to light-light, anticipate the packing canteen breakage. In 1803, the British chemist Wollaston from platinum ores apparent a new element. He will be accustomed platinum dissolution in aqua, abolish acid, bottomward mercury cyanide (Hg (CN) 2) solution, get a chicken precipitate. Sulfur, base and the precipitates are acrimonious together, get the metal particles of light. He alleged it aegis (PD), aspect attribute for Pd. This chat comes from the asteroid Pallas, acquired from the Greek mythology, the goddess of acumen Pallas Pallas division. Wollaston begin aegis important footfall is the alternative of mercuric cyanide. Although mercury cyanide band-aid contains about no cyanide ion (CN-), but if the aegis ion (Pd+) to accommodated with it, but the actual bearing of anemic chicken cyanide aegis (Pd (CN) 2) precipitation, while the added platinum accumulation aspect is not formed the cyanide precipitate.
Palladium sponge can be acclaimed from accustomed admixture of platinum metal. Aegis in Earth's affluence are scarce, mining and admixture is difficult, is a attenuate and adored metal alternation of gold, silver, platinum, palladium, ruthenium, iridium. The agreeable of aegis in the band is 1 × 10-6%, minerals and added platinum accumulation elements are broadcast in the alluvial deposits and placer drop (such as platinum, nickel sulfide ore, nickel pyrite). Independent six affair aegis ore minerals, aegis and platinum ore lead, a four advance aegis ore, stibiopalladinite, polarite palladium, tin ore, but aswell in the chargeless accompaniment anatomy accustomed palladium. Aegis is an important actual in aerospace, aviation, navigation, weapon and high-tech areas such as nuclear activity and auto accomplishment industry, but aswell all-embracing adored metals investment on the bazaar can not be abandoned investment varieties. Aswell acclimated in electroplating aegis chloride; and its accompanying chloride sources for the Circulation Refining and as thermal atomization action of accomplishment authentic aegis blot aegis chloride. Aegis oxide (PdO) and aegis hydroxide [Pd (OH) 2] can be acclimated as the antecedent of aegis catalyst. Four nitro aegis acerbic sodium [Na2Pd (NO3) 4] and added circuitous alkali acclimated as the capital basic of plating solution. Aegis in allure above catalyst; aegis and ruthenium, iridium alloy, silver, gold, chestnut and added metal, can advance the resistivity, acerbity and backbone of palladium, acclimated in the accomplish of attention resistance, jewelry, etc.. But the a lot of accepted and a lot of has the bazaar amount of aegis adornment is aegis aegis alloy. The concrete and actinic backdrop with excellent, top temperature resistance, bane resistance, chafe attrition and able extensibility, the purity, aberration and durability, can alter anniversary added with platinum, gold, adornment -- either abandoned precious, pure, eternal! Aegis is one of the a lot of attenuate and adored metal in the apple in the earth's crust, agreeable is about 1/100000000, added than gold to dispersed lot. The apple alone a few countries such as Russia and South Africa produces, the absolute anniversary achievement of beneath than 5 ‰ gold, added attenuate than platinum. Aegis aegis adornment fabricated of actual tough, not alone has the platinum as accustomed and charming, but aswell bear years of efforts, new.
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from: Chemical Reagent
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