The role of butylbenzene carbenium ions in the acid catalyzed cracking of polystyrene. Transformation of n-butylbenzene, sec-butylbenzene, iso-butylbenzene, tert-butylbenzene, 4-phenyl-1-butene, n-propylb

详细信息    查看全文

• 作者：Marek Marczewski ; Magdalena Kominiak…
• 关键词：Polystyrene decomposition ; Butylbenzenes reactions ; Acid strength ; Silicaalumina ; Alumina
• 刊名：Reaction Kinetics, Mechanisms and Catalysis
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：119
• 期：1
• 页码：107-120
• 全文大小：670 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Industrial Chemistry and Chemical Engineering
  Physical Chemistry
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1878-5204
• 卷排序：119

文摘

The obtained results show that styrene dimers, which are the primary transition products of PS cracking undergo consecutive reactions over acid centers of high acid strength (SiO₂–Al₂O₃(45 %); −10.8 < H_O ≤ −7.9) as well as centers of low acid strength (γ-Al₂O₃; H_O > −3.3) at sufficiently high reaction temperatures (723–773 K). It is proposed that phenylbutenyl carbenium ion obtained due to dealkylation reaction converts into coke by the successive elimination of H+ and H− ions, which in turn take part in hydrogen transfer reactions resulting in the hydrogenation of styrene dimers to diphenylbutane. The dealkylation of this compound leads to active γ-butylbenzene carbenium ion which is a key intermediate for the formation of indane and naphthalene derivatives.