noble metal

noun
any of a number of metals, as gold, silver, mercury, or platinum, that resist oxidation when heated in air, and solution by inorganic acids.

Origin:
1350–1400; Middle English: precious metal

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

noble metal

any of several metallic chemical elements that have outstanding resistance to oxidation, even at high temperatures; the grouping is not strictly defined but usually is considered to include rhenium, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold; i.e., the metals of groups VIIb, VIII, and Ib of the second and third transition series of the periodic table.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Her research background is in heterogeneous catalysis and highly dispersed noble metal catalysts.
Also, in addition to promoting oxygen storage, ceria also helps maintain the dispersion of the catalyst's noble metal particles.
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