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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 m 2 /g. The compound is used as a desiccant (to keep things dry by adsorbing water from the air) and as a filter of fluoride , arsenic and selenium in ...
At higher temperatures pseudoboehmite is transformed to γ-alumina but the pore size distribution remains unchanged up to 1000 °C. [6] At around 1100 °C however, specific area significantly decreases because of sintering related to a transformation to α-Al 2 O 3 .
In such applications, air is supplied by an air compressor and is passed through a cartridge filter which, depending on the application, is filled with molecular sieve and/or activated carbon, finally being used to charge breathing air tanks. [9] Such filtration can remove particulates and compressor exhaust products from the breathing air supply.
Aluminium hydroxide is a feedstock for the manufacture of other aluminium compounds: calcined aluminas, aluminium sulfate, polyaluminium chloride, aluminium chloride, zeolites, sodium aluminate, activated alumina, and aluminium nitrate. [6]
Mesoporous carbon has porosity within the mesopore range and this significantly increases the specific surface area. Another very common mesoporous material is activated carbon which is typically composed of a carbon framework with both mesoporosity and microporosity depending on the conditions under which it was synthesized.
Heating the hydroxides leads to formation of corundum. These materials are of central importance to the production of aluminium and are themselves extremely useful. Some mixed oxide phases are also very useful, such as spinel (MgAl 2 O 4), Na-β-alumina (NaAl 11 O 17), and tricalcium aluminate (Ca 3 Al 2 O 6, an important mineral phase in ...
This riff on egg-in-a-hole, where a hole is cut into a slice of bread to hold and cook an egg, uses a bagel instead—so the hole’s already built in. The spinach-and-artichoke dip underneath the ...
Twin Tower, or regenerative desiccant dryers, have two vertical tanks filled with media. The compressed air is passed through a pressure vessel with two "towers" filled with a media such as activated alumina, silica gel, molecular sieve or other desiccant material. This desiccant material attracts the water from the compressed air via adsorption.
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