Platinum sponge , 99.9%metalsbasis , 7440-06-4

Synonym(s):
Pt/C;Platinum;Platinum black;Platinum black 98+;Platinum colloid

CAS NO.：7440-06-4

Empirical Formula: Pt

Molecular Weight: 195.08

MDL number: MFCD00011179

EINECS: 231-116-1

PRODUCT Properties

• Melting point: 1772 °C (lit.)
• Boiling point: 3827 °C (lit.)
• Density: 21.45 g/cm3 (lit.)
• refractive index: n20/D 1.347
• Flash point: 3825°C
• storage temp.: 2-8°C
• solubility: Soluble in hot aqua regia.
• form: wire
• Specific Gravity: 21.45
• color: White
• Resistivity: 10.6 μΩ-cm, 20°C
• Water Solubility: Insoluble
• Merck: 14,7529
• Exposure limits: ACGIH: TWA 1 mg/m3; OSHA: TWA 0.002 mg/m3; NIOSH: TWA 1 mg/m3
• Dielectric constant: 6.5（Ambient）
• Stability: Stable. Platinum black is highly flammable.
• InChIKey: BASFCYQUMIYNBI-UHFFFAOYSA-N
• CAS DataBase Reference: 7440-06-4(CAS DataBase Reference)
• NIST Chemistry Reference: Platinum(7440-06-4)
• EPA Substance Registry System: Platinum (7440-06-4)

Description and Uses

Platinum was discovered in Colombia, South America by Ulloa in 1735 and six years later in 1741 by Wood. The metal was isolated from native platinum by Delisle in 1775 and produced in malleable form by Chabaneau in 1786. Wollaston in 1803 developed a method of obtaining pure malleable platinum from crude platinum by extraction with aqua regia. The process led to the discovery of two other platinum group metals, palladium and rhodium, that were found in the aqua regia extract after platinum precipitated. Platinum derived its name from platina originating from the Spanish word plata for silver, because it was thought to be a trivial unwanted material associated with gold in gold mines of Central America.
Platinum occurs in nature as a bright-white cubic crystalline solid with metallic luster associated with other noble metals of its group. Platinum also occurs as the mineral sperrylite, PtAs2, found as tin-white brittle cubic crystals containing 52−57% platinum in certain nickel-bearing deposits. Some other minerals of platinum are cooperite PtS (Pt 80-86%); and braggite(Pt, Pd, Ni)S (Pt 58-60%). The abundance of platinum in the earth’s crust is estimated to be 0.005 mg/kg.

Because of its chemical and physical properties, platinum has many uses. It is used widelyin jewelry making and is often mixed with gold to improve gold’s strength and durability.
In the early 1800s it was known that when hydrogen is passed over powdered platinum, thehydrogen ignites without being heated and without consuming the platinum. This propertyled to a major use of platinum as a catalyst to speed up chemical reactions. An example is presentin the internal combustion engine that produces harmful gases. Gasoline fuel burns insidethe engine, as compared to the steam engine, where the fuel is burned outside the engine. Thecatalytic converter in automobiles uses a platinum-coated ceramic grid in the exhaust systemto convert unburned fuel to carbon dioxide and water. The platinum in the converter will lastas long as the car since a catalyst is not consumed by the chemical reaction.
As a catalyst, platinum is used for hydrogenation of liquid vegetable oils to produce solidforms of the oil, such as margarine. It is also used in the cracking process that breaks downlarge crude oil molecules into smaller, more useful molecules, such as gasoline. The catalyticproperties of platinum make it useful in the production of sulfuric acid (H₂SO₄) and in fuelcells that unite hydrogen and oxygen to produce electricity.

Safety

• Symbol(GHS): GHS02
• Signal word: Danger
• Hazard statements: H228
• Precautionary statements: P210-P240-P241-P280-P370+P378
• Hazard Codes: F,Xi,Xn,N
• Risk Statements: 11-37-20-36/37/38-36/37-40-42/43-22-50/53
• Safety Statements: 36-7/9-33-16-38-22-26-14-36/37/39-27-24/25-36/37-45-23-61-60
• RIDADR: UN 3264 8/PG 3
• OEB: C
• OEL: TWA: 1 mg/m3
• WGK Germany: 3
• RTECS: TP2160000
• TSCA: Yes
• HazardClass: 4.1
• PackingGroup: III
• HS Code: 28439000
• Hazardous Substances Data: 7440-06-4(Hazardous Substances Data)
• IDLA: 4 mg Pt/m3