Synthesis of Mesoporous Spherical Aluminum Phosphate Particles Using Metal Ions
✍ Scribed by Kazuhiko Kandori; Nakaba Ikeguchi; Akemi Yasukawa; Tatsuo Ishikawa
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 433 KB
- Volume
- 202
- Category
- Article
- ISSN
- 0021-9797
No coin nor oath required. For personal study only.
✦ Synopsis
spherical particles were also controlled by using urea and Influences of various kinds of divalent and trivalent metal ions isopropylamine (2). Incidentally, it is well known that mion the formation, sizes, and pore structures of spherical aluminum croporous crystalline aluminum phosphate (AlPO) can be phosphate particles were investigated. The addition of metal ions endowed with Brønsted acidity by isomorphous substitution dramatically decreased the size of the spherical particles. A reof hetero atoms into its crystal structure. (3-6). Indeed, markable particle size reduction was observed in the systems AlPO-18 substituted with silicon and divalent metal (dedoped with trivalent Fe 3/ ions compared with those doped with noted SAPO-18 and MAPO-18, respectively) has been syndivalent Co 2/ , Zn 2/ , and Mn 2/ ions. Incorporation of Fe 3/ ions thesized, and these molecular sieves have been revealed to into the crystal lattice to give solid solutions with a chemical combe excellent solid acid catalysts for methanol conversion to position of Al 1-x Fe x PO 4 rnH 2 O was observed in the systems doped with trivalent Fe 3/ ions, though no substitution to yield particles light alkanes (7, 8). Therefore, it is expected that doping with a chemical composition of AlPO 4 rnH 2 O occurred for divalent metal ions into the crystal structure of spherical aluminum ions. The divalent metal ions were adsorbed onto primary fine phosphate particles, as well as into AlPO, offers characterisparticles to interfere with particle growth. The divalent metal ions tic and valuable properties. Hence, the present study attempts residing among the primary particles in secondary spherical alumito dope the metal ions into spherical aluminum phosphate num phosphate particles were eliminated by rinsing and produced particles using a coprecipitation method. This work deals highly mesoporous materials without altering the particle morwith the influence of various kinds of metal ions on the phology. A similar mechanism was depicted for particle formation formation, size, and pore and surface structures of spherical in the presence of Fe 3/ ions and incorporation into the crystal aluminum phosphate particles. An understanding of the structure. The spherical aluminum phosphate particles produced properties of spherical aluminum phosphate particles prowith Co 2/ ions exhibited an electrically neutral surface in the duced with various kinds of metal ions is important for the aqueous medium, while those formed with Fe 3/ ions manifested an acidic surface due to phosphate ions exposed on particle sur-application of the materials in industrial fields. faces.