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Statements

Subject Item
dbr:Activated_alumina
rdf:type
yago:WikicatFilters yago:Filter103339643 yago:Instrumentality103575240 yago:PhysicalEntity100001930 yago:Object100002684 yago:Device103183080 yago:Whole100003553 yago:Artifact100021939
rdfs:label
Alumine activée Alumina ativada 活性氧化鋁 Activated alumina
rdfs:comment
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 adsorbing 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. L'alumine activée (AA) est un oxyde d'aluminium poreux de surface spécifique très élevée (jusqu'à plus de 300 m2/g). 活性氧化鋁(Activated aluminum oxide or activated alumina)又稱活性礬土或活性鋁氧。為高孔性或顆粒狀之氧化鋁體，具有吸收氣體、蒸氣及特定液體和水分之能力。與CaCl2、矽膠相比可說是更強勁的除水劑。使用過後可藉由加熱至170°C~300°C來做再生。吸附之再生可重複多次。 Alumina ativada é produzida a partir do hidróxido de alumínio por de hidroxilização, resultando em um material feito quase que totalmente de óxido de alumínio (alumina; Al2O3), o mesmo material que safiras e rubis. Tal processo resulta num material altamente poroso; tendo uma alta taxa de superfície por peso. Este material pode ter uma área de superfície significativamente acima de 200 metros quadrados/grama, o que significa ter uma quantidade grande de poros muito pequenos, quase como túneis, que o atravessam.
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dbo:abstract
活性氧化鋁(Activated aluminum oxide or activated alumina)又稱活性礬土或活性鋁氧。為高孔性或顆粒狀之氧化鋁體，具有吸收氣體、蒸氣及特定液體和水分之能力。與CaCl2、矽膠相比可說是更強勁的除水劑。使用過後可藉由加熱至170°C~300°C來做再生。吸附之再生可重複多次。 L'alumine activée (AA) est un oxyde d'aluminium poreux de surface spécifique très élevée (jusqu'à plus de 300 m2/g). Alumina ativada é produzida a partir do hidróxido de alumínio por de hidroxilização, resultando em um material feito quase que totalmente de óxido de alumínio (alumina; Al2O3), o mesmo material que safiras e rubis. Tal processo resulta num material altamente poroso; tendo uma alta taxa de superfície por peso. Este material pode ter uma área de superfície significativamente acima de 200 metros quadrados/grama, o que significa ter uma quantidade grande de poros muito pequenos, quase como túneis, que o atravessam. O composto é usado como um dessecante (para manter coisas secas ou absorver água do ar) e como um filtro de fluoreto, arsênio e selênio em água potável. 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 adsorbing 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.
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