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1 Acta Chromatographica

1 2006

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Precipitation of aluminum hydroxide from sodium aluminate, by treatment with formalin, and preparation of aluminum oxide

Hayrapetyan S. S., Mangasaryan L. G., Tovmasyan M. R., Khachatryan H. G.

Acta Chromatographica

2006

No. 16

192-203

Aluminum oxide has been prepared by thermal dissociation of aluminum hydroxide obtained by precipitation, with formalin, from sodium aluminate with Na2O/Al2O3 molar ratio, M, between 1.5 and 2.0. The effect of aluminate molar ratio on the pore volume and specific surface area of the aluminum oxide was investigated. It was found that pore volume and specific surface area increased with decreasing Na2O/Al2O3 molar ratio. Aluminum oxide of pore volume 0.60–0.63 cm3 g-1 and specific sur-face area 300–320 m2 g-1 was obtained from sodium aluminate with M = 1.5. It was found that the concentration of the sodium aluminate mother liquor affects the yield of aluminum oxide and the pore volume but does not significantly affect the specific surface area.