Wacker-oxidation of ethylene over pillared layered material catalysts

R. Barthos, András Hegyessy, Zoltán May, J. Valyon

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This paper concerns the Wacker oxidation of ethylene by oxygen in the presence of water over supported Pd/VO x catalysts. High surface area porous supports were obtained from layer-structured materials, such as, montmorillonite (MT), laponite (smectites), and hydrotalcite (layered double hydroxide, LDH) by pillaring. Before introduction of Pd, supports MT and LDH were pillared by vanadia. The laponite was used in titania-pillared form (TiO2-LAP) as support of Pd/VO x active component. Acetaldehyde, acetic acid and CO2 were the products with yields and selectivities, depending on the reaction conditions and the properties of the applied catalyst. Under comparable conditions the pillared smectite catalysts gave higher AcH yield than the pillared LDH catalyst. UV-Vis spectroscopic examination suggested that the pillared smectites contained polymeric chains of VO4, whereas only isolated monomeric VO4 species were present in the pillared LDH. The higher catalytic activity in the Wacker oxidation was attributed to the more favorable redox property of the polymeric than of the monomeric vanadia. The V3+ ions in the polymeric species can reduce O2 to O2- ions, whereas the obtained V 5+ ions are ready to pass over O to Pd0 to generate PdO whereon the oxidation of the ethylene proceeds. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)702-710
Number of pages9
JournalCatalysis Letters
Volume144
Issue number4
DOIs
Publication statusPublished - Apr 2014

Fingerprint

Ethylene
Bentonite
Oxidation
Catalysts
hydrotalcite
Ions
Clay minerals
Acetaldehyde
Catalyst supports
Acetic acid
Acetic Acid
Catalyst activity
Titanium
Oxygen
ethylene
hydroxide ion
Water
Smectite
laponite

Keywords

  • Pillared layered materials
  • Supported Pd/VO catalyst
  • UV-Vis spectroscopy H-TPR
  • Wacker oxidation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Wacker-oxidation of ethylene over pillared layered material catalysts. / Barthos, R.; Hegyessy, András; May, Zoltán; Valyon, J.

In: Catalysis Letters, Vol. 144, No. 4, 04.2014, p. 702-710.

Research output: Contribution to journalArticle

Barthos, R. ; Hegyessy, András ; May, Zoltán ; Valyon, J. / Wacker-oxidation of ethylene over pillared layered material catalysts. In: Catalysis Letters. 2014 ; Vol. 144, No. 4. pp. 702-710.
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