295396

Sigma-Aldrich

Hydrogen

≥99.99%

Empirical Formula (Hill Notation):
H2
CAS Number:
Molecular Weight:
2.02
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.22

Quality Level

vapor density

0.07 (21 °C, vs air)

assay

≥99.99%

autoignition temp.

1060 °F

expl. lim.

74.2 %

impurities

≤10 ppm oxygen
≤5 ppm water

bp

−252.8 °C (lit.)

mp

−259.2 °C (lit.)

SMILES string

[H]

InChI

1S/H2/h1H

InChI key

UFHFLCQGNIYNRP-UHFFFAOYSA-N

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General description

Hydrogen(H2) is colorless, odorless, tasteless, non-toxic, and highly flammable diatomic gas.

Application

H2 can be used:
  • To reduce metal oxide to metal.
  • In the catalytic hydrogenation of nitro compounds, ketones, and olefinic compounds.

Packaging

56 L in steel cylinder

Other Notes

For 295396-50L-EU packaging: 50 L of steel cylinder equipped with brass valve.

Recommended products

  • For 295396-56L: Z146706 CGA 180 Regulator OR Z146943 CGA 110 Valve, with Z147095 CGA 110 to CGA 180 Adapter and Z146986 washer for adapter. Also recommended Z562599 CGA 180 Lecture Bottle Station.
  • For 295396-50L-EU: outlet fitting: DIN 477-1 no.1, Z742162 or Z742164 are the recommended regulators.

Pictograms

FlameGas cylinder

Signal Word

Danger

Hazard Statements

Precautionary Statements

hazcat

Flam. Gas 1 - Press. Gas Compr. Gas

storage_class_code

2A - Gases

WGK Germany

nwg

Flash Point(F)

-238.0 °F - closed cup

Flash Point(C)

< -150 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

Effects of reduction temperature and metal- support interactions on the catalytic activity of Pt/γ-Al2O3 and Pt/TiO2 for the oxidation of CO in the presence and absence of H2
Alexeev OS, et al.
The Journal of Physical Chemistry B, 109(49), 23430-23443 (2005)
Kinetics of reduction of iron oxides by H2: Part I: Low temperature reduction of hematite
Pineau A, et al.
Thermochimica Acta, 447(1), 89-100 (2006)
Gold catalysts open a new general chemoselective route to synthesize oximes by hydrogenation of α, β,-unsaturated nitrocompounds with H2
Corma A, et al.
Journal of the American Chemical Society, 129(20), 6358-6359 (2007)
Metal-free catalytic olefin hydrogenation: low-temperature H2 activation by frustrated Lewis pairs
Greb L, et al.
Angewandte Chemie (International ed. in English), 51(40), 10164-10168 (2012)
Takashi Kumagai et al.
Nature chemistry, 6(1), 41-46 (2013-12-19)
Although the local environment of a molecule can play an important role in its chemistry, rarely has it been examined experimentally at the level of individual molecules. Here we report the precise control of intramolecular hydrogen-transfer (tautomerization) reactions in single...
Protocols
Separation of Hydrogen; Oxygen; Nitrogen; Carbon monoxide; Methane; Carbon dioxide; Acetylene; Ethylene; Ethane
Read More

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