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295396

Sigma-Aldrich

Hydrogen

≥99.99%

Synonym(s):

Hydrogen gas

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About This Item

Empirical Formula (Hill Notation):
H2
CAS Number:
1333-74-0
Molecular Weight:
2.02
EC Number:
215-605-7
MDL number:
MFCD00070838
UNSPSC Code:
12142100
PubChem Substance ID:
24857780
NACRES:
NA.22

vapor density

0.07 (21 °C, vs air)

Quality Level

200

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

Supplied in a carbon steel lecture bottle with a CGA180M/CGA110F needle valve installed.

Compatible with the following:
  • Aldrich® lecture-bottle station systems
  • Aldrich® lecture-bottle gas regulators

Other Notes

See Technical Information Bulletin AL-151 Gas Regulators: Selection, Installation, and Operation

Legal Information

Aldrich is a registered trademark of Sigma-Aldrich Co. LLC

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pictograms

FlameGas cylinder
GHS02,GHS04

signalword

Danger

hcodes

H220,H280

Hazard Classifications

Flam. Gas 1A - Press. Gas Compr. Gas

Storage Class

2A - Gases

wgk_germany

nwg

flash_point_f

<-238.0 °F - closed cup

flash_point_c

< -150 °C - closed cup

ppe

Eyeshields, Faceshields, Gloves, multi-purpose combination respirator cartridge (US)

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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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)
Catalytic reductive transformations of carboxylic and carbonic acid derivatives using molecular hydrogen
Dub, Pavel A and Ikariya, Takao
ACS Catalysis, 2(8), 1718-1741 (2012)
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)
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)
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)
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