蛋壳粉

Description

Palladium · CAS 7440-05-3 · Pd. UNII 5TWQ1V240M. Boiling Point: 2963 °C; Boiling Point: 2963 °C @760 [mm Hg]; Melting Point: 1554.9 °C.

Identification

CAS Registry Number	7440-05-3
PubChem CID	23938
Molecular formula	Pd
IUPAC name	palladium
UNII (FDA)	5TWQ1V240M

Computed Descriptors

Molecular Weight	106.42
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	0
Exact Mass	105.90348
Monoisotopic Mass	105.90348
Topological Polar Surface Area	0
Heavy Atom Count	1
Formal Charge	0
Complexity	0

Physical & Chemical Properties

Boiling Point	2963 °C
Boiling Point	2963 °C @760 [mm Hg]
Melting Point	1554.9 °C
Melting Point	1554.8 °C
Density	12.02 g/cu cm
Density	12 @25 °C
Vapor Pressure	3.47 Pa (0.0260 mm Hg) at 1552 °C
Formulations/Preparations	Grade: CP (99.99%), technical (99.0%)

Physical description & handling notes

• Steel-white metal that does not tarnish in air; Oxidation states: 2+ and 4+; [Nordberg, p. 1113]
• Solid
• Silver-white, ductile metal
• Steel white
• Silver-white metal; cubic
• Soluble in aqua regia and fused alkalies; insoluble in organic acids

Regulatory Status

GHS notification summary	59.3% (365 / 616)

GHS Hazard Classification

GHS notification summary	59.3% (365 / 616)
Reported hazard statements	H228 (31.5%), H315 (17.7%), H319 (18%), H335 (15.9%), H413 (17%)

Documented Uses

• Platinum, gold, and nickel ores contain palladium. Palladium has been used as a hydrogenation catalyst. [HSDB] One of 6 metals in the platinum group that also includes Rh, Ru, Ir, and Os; Highest use in electronic, dental, and catalytic products; Occupational exposures occur in mining and dental laboratories; Used as a catalyst in many industries; General public exposures occur from automobile catalytic converters, dental restorations, and jewelry; [Nordberg, p. 1113-20]
• Metal Extraction and Refining [Category: Industry]
• Palladium is used in gold, silver and copper alloys in dentistry. Alloys are also used for bearings, strings, and balance wheels in watches. Palladium is used as a catalyst in the manufacture of sulfuric acid. In powder form it is used as a catalyst in hydrogenation. The sponge form is used for separation of hydrogen from a mixture of gases. Silver alloys are used for electrical contacts.
• The automotive industry has used palladium in catalytic converters since 1974. ... In jewelry, palladium hardened with 4-5% ruthenium provides a light, white, strong, tarnish-free alloy for watch cases, brooches, and settings for gems.
• ...For alloy bearings, springs, balance wheels of watches; for mirrors in astronomical instruments; as catalyzer in manufacture of sulfuric acid and in other oxidizing processes.
• Alloys for electrical relays and switching systems in telecommunication equipment, catalyst for reforming cracked petroleum fractions and hydrogenation, metallizing ceramics, "white" gold in jewelry, aircraft spark plugs, protective coatings.

Synonyms

PALLADIUM; 7440-05-3; Palladium element; paladio; Palladex 600; Palladium, elemental; 5TWQ1V240M; DTXSID4064680; CHEBI:33363; PALLADIUM METALLICUM; RefChem:6098; DTXCID2047644; 231-115-6; Palladium on carbon; Palladium Black; Palladium on barium sulfate

Frequently Asked Questions

What are the CAS number and molecular formula of Palladium?

CAS 7440-05-3; molecular formula Pd; molecular weight — g/mol.

What other names is Palladium known by?

PALLADIUM, 7440-05-3, Palladium element, paladio, Palladex 600, Palladium, elemental.

Is Palladium classified as hazardous?

59.3% of GHS notifications report no hazard classification (365 of 616).

What are the key physical properties of Palladium?

Boiling Point: 2963 °C; Boiling Point: 2963 °C @760 [mm Hg]; Melting Point: 1554.9 °C; Melting Point: 1554.8 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.