199974

Sigma-Aldrich

Aluminum oxide

activated, neutral, Brockmann I

Synonym(s):
Alumina
Linear Formula:
Al2O3
CAS Number:
Molecular Weight:
101.96
EC Number:
MDL number:
eCl@ss:
38120402
PubChem Substance ID:
NACRES:
SB.52

Quality Level

grade

Brockmann I
activated
standard grade

form

powder

manufacturer/tradename

CAMAG 507-C-I

application(s)

ion chromatography: suitable

impurities

<0.03% Fe2O3
<0.03% SiO2
<0.4% Na2O

particle size

40-160 μm

pore size

58 Å pore size

surface area

205 m2/g

pH

7.0±0.5 ( in H2O)

mp

2040 °C (lit.)

SMILES string

O=[Al]O[Al]=O

InChI

1S/2Al.3O

InChI key

TWNQGVIAIRXVLR-UHFFFAOYSA-N

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General description

The mechanism of formation of protective scales of α-Al2O3 on surfaces of binary M-Al (M = Fe, Ni or Co) alloys at high temperatures has been studied. Activated aluminum oxides having different acidities and water concentrations (having Brockmann activity I-V) can easily detect various types of water (namely free water, pore water, and bound water) on the aluminum oxide present in soils.

Application

Aluminum oxide (Alumina, Al2O3) has been used in the preparation of one-step self-assembled double-helices of multiwalled carbon nanotubes (MWCNT) arrays (composed of Fe nanoparticles bound to SiOx micro-particles).
Aluminum oxide (neutral) has been used in the preparation of alumina supported silver (Ag/Al2O3) catalyst suitable for selective catalytic reduction of nitrogen oxides (NOx) by hydrocarbons (HC-SCR).

Packaging

100 g in poly bottle
1 kg in poly bottle
5 kg in poly drum
Brockmann aluminum oxides are suitable for column chromatography and adsorptive filtration.

storage_class_code

11 - Combustible Solids

WGK Germany

nwg

Flash Point F

Not applicable

Flash Point C

Not applicable

Certificate of Analysis

Certificate of Origin

The role of Ag O Al entities in adsorption of NCO species and reduction of NO x.
Deng H, et al.
Catalysis Today, 258, 35-40 (2015)
Carbon nanotube bundles self-assembled in double helix microstructures.
Cervantes-Sodi F, et al.
Carbon, 50(10), 3688-3693 (2012)
Prescott R and Graham MJ.
Oxidation of Metals, 38(3-4), 233-254 (1992)
Thermoanalytical studies of water on activated alumina, Brockmann I-V,(acid, neutral, basic) from- 60? to+ 700? C.
Hampson JW and Bleam WF.
Thermochimica Acta, 288(1), 179-189 (1996)
Chien-Chih Lin et al.
Nanoscale, 5(17), 8090-8097 (2013-07-25)
We demonstrated a promising route for enhancing temperature sensitivity, improving saturation voltage, and reducing power consumption of the MOS(p) tunneling temperature sensors by introducing ultrathin Al2O3 into the dielectric stacks. Detailed illustrations of the working mechanism and device concept are...

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