The acid-catalysed reaction of α-pinene over molybdophosphoric acid immobilised in dense polymeric membranes

J. E. Castanheiro, A. M. Ramos, I. Fonseca, J. Vital

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The α-pinene hydration to α-terpineol was studied using as catalysts polymeric catalytic membranes consisting of HPMo entrapped in polyvinyl alcohol (PVA) cross-linked with 10, 20 and 30% of succinic acid, and HPMo encaged in USY zeolites dispersed in a polydimethylsiloxane (PDMS) matrix. In the case of HPMo/PVA membranes it was observed that membrane activity increases with the polymer cross-linking, due to the increase in membrane hydrophobicity, up to the limit of the increasingly restrictions to the molecules mobility. The HPMo-USY/PDMS membrane shows a significantly higher activity for pinene hydration, which is even higher than that observed with USY encaged HPMo alone. However, selectivity to α-terpineol (65% at 80% conversion) is slightly lower than that obtained for the HPMo/PVA cross-linked with 20 or 30% of succinic acid (70-75% at 90% conversion). For both catalytic membranes, HPMo/PVA or HPMo-USY/PDMS, the stability is reasonable good and catalyst activity increases in the subsequent uses of the same membrane, probably due to the interaction between retained α-terpineol and the polymer matrix.

Original languageEnglish
Pages (from-to)187-193
Number of pages7
JournalCatalysis Today
Volume82
Issue number1-4
DOIs
Publication statusPublished - 30 Jul 2003

Keywords

  • Catalytic polymeric membranes
  • Encapsulation
  • Heteropolyacid
  • PDMS
  • PVA
  • Y-type zeolite

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