Preparation of Various Aluminum Orthophosphates and Condensed Phosphates and their Catalytic Properties

Authors: Onoda, Hiroaki; Kohno, Masakazu; Tamaki, Jun; Kojima, Kazuo; Nariai, Hiroyuki

Source: Multidiscipline Modeling in Materials and Structures, Volume 2, Number 4, 2006 , pp. 463-470(8)

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Abstract:

Aluminum phosphate is useful catalyst for many reactions. There are a lot of reports about catalytic activities of aluminum phosphate, however little reports about the relationship among the preparation, composition, catalytic activity of this phosphate. Phosphates transform to various other phosphates with hydrolysis and dehydration reactions by heating. In this work, some aluminum orthophosphates and condensed phosphates were prepared, and their compositions were estimated. Furthermore, specific surface area, acid strength, the amount of acidic sites, and the catalytic activities for the decomposition of trifluoromethane of these salts were investigated. Aluminum ortho- and polyphosphates were prepared in the systems of ortho- and poly-phosphates. The catalytic activity for decomposition of CHF₃ was related with a certain degree of specific surface area, acid strength, and the amount of acidic sites. Aluminum orthophosphate with a small amount of sodium cation had higher catalytic activity at lower temperature.

Keywords: ALUMINUM PHOSPHATE; CONDENSATION DEGREE OF PHOSPHATES; PREPARATION IN AQUEOUS SOLUTION; CATION EXCHANGE RESIN; SODIUM CATION; CATALYTIC PROPERTIES

Document Type: Research article

DOI: http://dx.doi.org/10.1163/157361106778554860

Publication date: 2006-09-01