Stainless Steel Bending Tube With Plate

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Platinum and Palladium

by Ben SmyeonAugust 1, 2019

Platinum is probably the best known PGM, largely for its use in jewellery making. It is among the densest of the group, along with iridium and osmium, with a high melting point and temperature stability.

In fact, platinum is 11 per cent denser than gold and around twice the weight of the same volume of silver or lead. Platinum’s stable and rare properties are favoured for electronic devices and applications, and medical uses because of its high biological compatibility.

Platinum is also highly resistant to corrosion oxidation. The element’s capabilities as a good oxidation catalyst are the reason behind its popularity in the manufacture of catalytic converters. Indeed, one of the most prominent uses of PGMs is as automotive emission control catalysts — these catalyse nitrogen oxide (NOx) to nitrogen and oxidise carbon monoxide and hydrocarbons. Other automotive applications for platinum include oxygen sensors and spark plugs.

Palladium — a soft, silvery-white metal — is also used in catalytic converters as a substitute for the more expensive platinum. It is known as the most corrosion-resistant pure metal, and can resist salts, oxides and mineral acids but is affected by sodium chloride and sodium cyanide. It also has a high melting point — albeit the lowest of all the platinum group metals — and resistance to deformation that makes is very useful for strengthening alloys.

Palladium’s unique ability to absorb hydrogen is useful for chemical processes involving hydrogen exchange between two reactants — e.g. to produce the raw materials for synthetic rubber and nylon. Meanwhile, the radioactive isotope of palladium is being tested for the treatment of breast and prostate cancers.

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