Activated Alumina Catalyst CAS 1344-28-1
Product Description
Actived Alumina CAS:1344-28-1
Activated alumina is manufactured from aluminium hydroxide by dehydroxylating it in a way that produces a highly porous material; this material can have a surface area significantly over 200 m²/g. The compound is used as a desiccant (to keep things dry by absorbing water from the air) and as a filter of fluoride, arsenic and selenium in drinking water. It is made of aluminium oxide (alumina; Al2O3). It has a very high surface-area-to-weight ratio, due to the many "tunnel like" pores that it has. Activated alumina in its phase composition can be represented only by metastable forms (gamma-Al2O3 etc.). Corundum (alpha-Al2O3), the only stable form of aluminum oxide, does not have such a chemically active surface and is not used as a sorbent.
| Property | Unit | Standard values | |
| Shape | Beads | ||
| Diameter | mm | 3.0-5.0 | 4.0-6.0 |
| Al2O3 | % | ≥94.5 | ≥94.5 |
| SiO2 | % | ≤0.10 | ≤0.10 |
| Fe2O3 | % | ≤0.03 | ≤0.03 |
| Na2O | % | ≤0.40 | ≤0.40 |
| Static adsorption capacity | % | ≥17.5 | ≥17.5 |
| Bulk density | g/cm³ | ≥0.70 | ≥0.70 |
| Abrasion | % | ≤0.2 | ≤0.2 |
| Crushing strength | N | ≥180 | ≥200 |
| Specific surface area | m2/g | ≥300 | ≥300 |
| Pore volume | cm3/g | ≥0.40 | ≥0.40 |
Activated alumina is used for a wide range of adsorbent and catalyst applications including the adsorption of catalysts in polyethylene production, in hydrogen peroxide production, as a selective adsorbent for many chemicals including arsenic, fluoride, in sulfur removal from fluid streams (Claus Catalyst process).
Used as a desiccant, it works by a process called adsorption. The water in the air actually sticks to the alumina itself in between the tiny passages as the air passes through them. The water molecules become trapped so that the air is dried out as it passes through the filter. This process is reversible. If the alumina desiccant is heated to ~200 °C, it will release the trapped water. This process is called regenerating the desiccant.
Activated alumina is also widely used to remove fluoride from drinking water.
Activated alumina filters can easily reduce fluoride levels from 10 ppm to less than 1 ppm. The amount of fluoride leached from the water being filtered depends on how long the water is actually touching the alumina filter media. Basically, the more alumina in the filter, the less fluoride will be in the final, filtered water. Lower temperature water, and lower pH water (acidic water) are filtered more effectively too. Ideal pH for treatment is 5.5, which allows for up to a 95% removal rate.
In high vacuum applications, activated alumina is used as a charge material in fore-line traps to prevent oil generated by rotary vane pumps from back streaming into the system.
Package&Storage
Airtight packaging must be stored in a dry place,
waterproof and moisture-proof.
No contact with water or steam.
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Product Categories : Inorganic Chemicals > Oxide