MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Adsorption Property of Water Vapor on AlPO4-5 Synthesized from Aluminum Dross
Norihiro MurayamaMakoto BabaJun-ichi HayashiJunji ShibataMarjorie Valix
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2013 Volume 54 Issue 12 Pages 2265-2270

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Abstract

The aluminophosphate type zeolitic material, AlPO4-5 was synthesized by hydrothermal method using aluminum dross as a raw material, and its water vapor adsorption property was studied. Porous AlPO4-5 and nonporous AlPO4 were formed, and the selectivity of their formation was determined by varying the reactant ratios. Both AlPO4-5 and tridymite type AlPO4 (nonporous phosphate) were obtained from aluminum dross when the reaction products were synthesized with the following composition, Al2O3 : P2O5 : triethylamine (TEA) : H2O = 1 : 1 : 1 : 40. While AlPO4-5 was preferentially synthesized as a main product when the compositions were Al2O3 : P2O5 : TEA : H2O = 2 : 1 : 1 : 40 and 1 : 1 : 2 : 40. The variation in the reactant ratio dictated the specific surface area of the resulting reaction products. The formation of AlPO4-5 with a composition of 1 : 1 : 2 : 40 generated surface area of 353 m2/g. The reaction products synthesized at 2 : 1 : 1 : 40 and 1 : 1 : 1 : 40 generated surface areas of 187 and 75 m2/g, respectively. All the aluminophosphate products exhibited the type IV or V isotherm by IUPAC classification for water vapor adsorption due to the AlPO4-5 pore with strong affinity. This study demonstrated the efficacy of AlPO4-5 obtained from aluminum dross as desiccant, that is, the aluminum dross-derived AlPO4-5 demonstrated high adsorption capacity and adsorption properties suitable as an adsorbent or a desiccant.

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© 2013 The Mining and Materials Processing Institute of Japan
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