Alumina

Viresh H. Rawal

Viresh H. Rawal

The Ohio State University, Columbus, OH, USA

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Seiji Iwasa

Seiji Iwasa

The Ohio State University, Columbus, OH, USA

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Alan S. Florjancic

Alan S. Florjancic

The Ohio State University, Columbus, OH, USA

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Agnes Fabre

Agnes Fabre

The Ohio State University, Columbus, OH, USA

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First published: 15 April 2001

Abstract

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[1344-28-1] Al2O3 (MW 101.96)

InChI = 1S/2Al.3O

InChIKey = TWNQGVIAIRXVLR-UHFFFAOYSA-N

(a mildly acidic, basic, or neutral support for chromatographic separations; a reagent for catalyzing dehydration, elimination, addition, condensation, epoxide opening, oxidation, and reduction reactions)

Alternate Name: γ-alumina.

Physical Data: mp 2015 °C; bp 2980 °C; d 3.97 g cm−3.

Solubility: slightly sol acid and alkaline solution.

Form Supplied in: fine white powder, widely available in varying particle size (50–200 μm; 70–290 mesh), in acidic (pH 4), basic (pH 10), and neutral (pH 7) forms.

Drying: the activity of alumina has been classified by the Brockmann scale into five grades. The most active form, grade I, is obtained by heating alumina to 200 °C while passing an inert gas through the system, or heating to ∼400 °C in an open vessel, followed by cooling in a dessicator. Addition of 3–4% (w/w) water and mixing for several hours converts grade I alumina to grade II. Other grades are similarly obtained (grade III, 5–7%; grade IV, 9–11%; grade V, 15–19% water).2, 3

Handling, Storage, and Precautions: inhalation of fine mesh alumina can cause respiratory difficulties. Alumina is best handled under a fume hood and stored under dry, inert conditions.

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