13C MAS NMR mechanistic study of propane conversion into butanes over H-MFI catalyst

✍ Scribed by Irina I. Ivanova; Alexander I. Rebrov; Elena B. Pomakhina; Eric G. Derouane

• Book ID: 104424140
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 309 KB
• Volume: 141
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(98)00254-4

✦ Synopsis

The mechanism of propane conversion into butanes over H-MFI as catalyst has been investigated using controlled atmosphere 13 C MAS NMR spectrsocopy. The labelled reactant was propane 2-13 C and the reactant loading was varied from 0.5 to 4 molecules per MFI unit cell. The nature of the primary labelled products was found to depend on the propane partial pressure. A high pressure of propane enhances its bimolecular disproportionation to ethane and both butane isomers. At low pressure, the formation of i-butane only is favoured. A detailed mechanistic pathway is proposed to account for both high pressure and low pressure observations. The proposed mechanisms were ascertained by studying the effect of several Ž 13 .