Palladium

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Catalog Number
ACM7440053
Product Name
Palladium
Structure
Structure
CAS
7440-05-3
Category
Main Products
Description
Palladium on carbon, often referred to as Pd/C, is a form of palladium used as a catalyst. The metal is supported on activated carbon in order to maximize its surface area and activity.
Synonyms
ESCAT 1391;ESCAT 1371;ESCAT 1351;Paladium;PALLIDIUM
IUPAC Name
palladium
Molecular Weight
106.42
Molecular Formula
Pd
Canonical SMILES
[Pd]
InChI
1S/Pd
InChI Key
KDLHZDBZIXYQEI-UHFFFAOYSA-N
Boiling Point
2963 °C
Melting Point
1555ºC
Density
1.025 g/mL at 25ºC
Solubility
Soluble in aqua regia and fused alkalies; insoluble in organic acids
Appearance
Powder
Application
Among the platinum group metals, palladium is the least noble metal, exhibiting greater reactivity than other metals of the group. The metal forms mostly bivalent compounds, although a small number of tetravalent and a fewer trivalent compounds are known. Palladium exhibits a strong tendency to form complexes, most of which are four-coordinated square planar complexes of the metal in +2 oxidation state. When heated in air or oxygen above 350°C, palladium forms a black oxide, PdO coated over its surface. On further heating to over 790°C, the oxide decomposes back to the metal. Palladium dissolves more oxygen in molten state than in solid form.

Palladium reacts with fluorine and chlorine at 500°C forming its halides, the black PdF3 and the red deliquescent solid PdCl2.

Palladium is attacked by concentrated nitric acid, particularly in the presence of nitrogen oxides. The reaction is slow in dilute nitric acid. Finely divided palladium metal reacts with warm nitric acid forming palladium(II) nitrate, Pd(NO3)2. Hydrochloric acid has no affect on the metal. Reaction with boiling sulfuric acid yields palladium sulfate, PdSO4, and sulfur dioxide.

Palladium readily dissolves in aqua regia forming chloropalladic acid, H2PdCl6. Evaporation of this solution yields palladium(II) chloride, PdCl2.

Palladium absorbs hydrogen over 800 times its own volume over a range of temperature. By doing so, the metal swells, becoming brittle and cracked. Such absorption of hydrogen decreases the electrical conductivity of the metal. Also, such absorption activates molecular hydrogen, dissociating it to atomic hydrogen.
Storage
room temp
Assay
99.995% trace metals basis
Color/Form
Silver-white, ductile metal;Steel white;Silver-white metal; cubic
Complexity
0
Covalently-Bonded Unit Count
1
Decomposition
No decomposition. /from table/
EC Number
231-115-6
Exact Mass
105.90348g/mol
Form
powder
Formal Charge
0
Hazard Codes
Xn
H-Bond Acceptor
0
H-Bond Donor
0
Heavy Atom Count
1
HS Code
7110210000
MDL Number
MFCD00011167
Monoisotopic Mass
105.90348g/mol
Other Experimental
Palladium is the lightest of the platinum group and very malleable and ductile when pure. It resists oxidation at ordinary temperatures. It absorbs a considerable amount of hydrogen gas. It is appreciably volatile at high temperatures. At red heat it is converted to the oxide.;Stable isotopes: (102)Pd, 1.02%; (1.4)Pd, 11.14%; (105)Pd, 22.23%; (106)Pd, 27.33%; (108)Pd, 26.46%; (110)Pd, 11.72%;Usual valency, 2,4; ionic radius, 65 pm, crystal structure, face-centered cubic; lattice constant, 389 pm; reflectance, 54%; thermal expansion, 11.11X10+6 °C-1; magnetic susceptibility, 5.23X10-6 cu cm/g; work function, 4.99 eV; Young's modulus, 1.24X10+8 kN/sq m; ultimate tensile strength, 180-200 MPa; Poisson's ratio, 0.39; Vicker's hardness, 40; temperature coefficient of resistance 3.8X10-3 K-1; electrical resistivity at 0 °C, 9.93 microohm-cm; thermal conductivity, 75 W/m K;Palladium is stable in air, even at elevated temperatures; shows no corrosion or tarnishing in hydrogen sulfide atmospheres.;Enthalpy of formation at 298.15 K: 378.2 kJ/mol (gas); molar heat capacity at 298.15 K: 26.0 J/mol K (crystal), 20.8 J/mol K (gas);Enthalpy of fusion: 16.74 kJ/mol at 1554.9 °C
Packaging
1 g in glass bottle
Quality Level
100
RIDADR
UN 3089 4.1/PG 2
Rotatable Bond Count
0
Stability
Stable. Flammable – fine powder may cause fire or explosion in air. Incompatible with ozone, sodium tetrahydroborate, sulphur, arsenic.
Storage Conditions
Store at RT.
UNII
5TWQ1V240M
Vapor Pressure
3.47 Pa (0.0260 mm Hg) at 1552 °C
WGK Germany
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