Control of Size and Adsorptive Properties of Spherical Aluminum Phosphate Particles

✍ Scribed by Kazuhiko Kandori; Nakaba Ikeguchi; Akemi Yasukawa; Tatsuo Ishikawa

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 420 KB
• Volume: 182
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1996.0483

✦ Synopsis

of small particles exhibiting amorphous structure and have The size of amorphous spherical aluminum phosphate particles a high selective adsorption of H 2 O. This characteristic behavwas controlled by using urea and isopropylamine (IPA), and their ior was explained by rehydration of Al 3/ ions, produced texture was investigated by various means. The mean particle by outgassing without an appreciable structural change or diameter (D p ) of the particles decreased with increasing urea concollapse of the solid framework and by H 2 O penetration centration due to an acceleration in the precipitation reaction from into the particles. It can be presumed that H 2 O adsorption decomposition of urea at elevated temperatures. The D p decreased selectivity and catalytic activity strongly depend on particle upon addition of IPA concentrations of up to 6 mol% to Al ions size. Therefore, a procedure which can control the particle under a constant urea concentration, while D p increased above size will become an important technique for applying the this concentration because IPA produced electrolytes by reacting with HNO 3 ; the electrolytes may reduce the range of Coulombic material to industrial fields. Morales et al. (14) proposed repulsion between charged primary particles. All the particles adthat the formation of spherical aluminum phosphate particles sorbed selectively H 2 O molecules. IPA does not act as a template from a method utilized in the present study is regulated by but operates as an effective additive for controlling particle size competing effects from nucleation and proton adsorption without altering the inner texture of spherical aluminum phosonto crystal surfaces derived from hydrolysis of Al 3/ ions phate particles.