Preparation and catalytic properties of supported heteropolyacid salts

✍ Scribed by S. Soled; S. Miseo; G. McVicker; W.E. Gates; A. Gutierrez; J. Paes

• Book ID: 104357500
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 674 KB
• Volume: 64
• Category: Article
• ISSN: 0923-0467
• DOI: 10.1016/s0923-0467(96)03136-3

✦ Synopsis

Heteropoly compounds are receiving increasing interest as environmentally compatible solid acid catalysts. Partial Cs + exchange into 12tungstophosphoric acid converts the water soluble, low surface area ( < 5 m: g-' ) parent acid into submicron water-insoluble Brcnsted acids with surface areas exceeding 100 m 2 g-~. The insolubility of the Cs acid salt makes preparation of large particle supported catalysts by conventional impregnation procedures impractical, although applications in packed bed or slurry reactors require millimeter-sized pellets to avoid pressure drop or filtration problems. Here, we report on a new but simple technique that produces an eggwhite distribution of active Csacid salt of 12-tungstophosphoric acid within a large silica extrudate by carrying out a reaction deposition directly inside the extrudate. We examine these catalysts in aromatic alkylation reactions.