Catalytic conversions in aqueous media: A novel and efficient hydrogenation of polybutadiene-1,4-block-poly(ethylene oxide) catalyzed by Rh/TPPTS complexes in mixed micellar nanoreactors

Vasilis Kotzabasakis, Eleni Georgopoulou, Marinos Pitsikalis, Nikolaos Hadjichristidis, Georgios Papadogianakis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Exceptionally high catalytic activities (TOF > 840 h-1) were achieved in the aqueous phase hydrogenation of polybutadiene-1,4-block- poly(ethylene oxide) (PB-b-PEO) catalyzed by water-soluble Rh/TPPTS complexes [TPPTS = P(C6H4-m-SO3Na)3] in mixed micellar nanoreactors formed by dodecyltrimethylammonium chloride along with PB-b-PEO especially when n-hexane was added to the reaction system. This is the first example of a catalytic hydrogenation of an unsaturated polymer using water-soluble transition metal TPPTS complexes in aqueous media. Using Rh/TPPTS catalysts high activities were observed in the hydrogenation of PB-b-PEO in mixed micelles whereas in single micelles the activities were lower. Dynamic light scattering experiments showed the presence of mixed nanomicelles with smaller hydrodynamic radii compared to the radii of single micelles. A model of a mixed micellar nanoreactor was proposed to rationalize the observed results. The hydrogenation reaction was shown to be homogeneously catalyzed by Rh/TPPTS complexes generated in situ from RhCl3·3H2O and TPPTS under the reaction conditions. A recycling experiment showed that the catalytic activity remained high in a consecutive run even at a rhodium concentration of only 1 ppm in water.

Original languageEnglish (US)
Pages (from-to)93-101
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume231
Issue number1-2
DOIs
StatePublished - Apr 20 2005

Keywords

  • Aqueous media
  • Hydrogenation
  • Mixed micelles
  • Rhodium
  • TPPTS

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Catalytic conversions in aqueous media: A novel and efficient hydrogenation of polybutadiene-1,4-block-poly(ethylene oxide) catalyzed by Rh/TPPTS complexes in mixed micellar nanoreactors'. Together they form a unique fingerprint.

Cite this