The oxidation of isobutene to p-xylene over bismuth oxide-based catalysts

✍ Scribed by Goldwasser, Mireya R. ;Trimm, David L.

• Publisher: Blackwell Publishing
• Year: 1978
• Tongue: English
• Weight: 370 KB
• Volume: 28
• Category: Article
• ISSN: 0142-0356
• DOI: 10.1002/jctb.5700281107

✦ Synopsis

Studies have been carried out of the optimisation of a bismuth oxide based catalyst for the oxidation of isobutene to p-xylene. Using a Bi203-Pz05 (Bi:P=2) catalyst located sequentially before a 3 04 Pt/AI?O3 catalyst, UP to 60:i selectivity can be observed at 50% conversion. The kinetics of the oxidation of isobutene over the Bi203-P205 catalyst have been measured for all major products. The results support a mechanism involving allylic oxidation of isobutene. Dimethylhexadiene and p-xylene are suggested to originate from reaction between two adsorbed isobutene molecules and monatomic oxygen species adsorbed at different sites. A major side product, methacrolein, appears to originate from reaction between two adsorbed isobutene molecules and a diatomic oxygen species.