NDLI: Wacker-Oxidation of Ethylene Over Pillared Layered Material Catalysts

Content Provider	Springer Nature Link
Author	Barthos, Róbert Hegyessy, András May, Zoltán Valyon, József
Copyright Year	2014
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 V5+ ions are ready to pass over O to Pd0 to generate PdO whereon the oxidation of the ethylene proceeds.
Starting Page	702
Ending Page	710
Page Count	9
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	144
Issue Number	4
e-ISSN	1572879X
Language	English
Publisher	Springer US
Publisher Date	2014-02-05
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wacker oxidation Supported Pd/VO x catalyst Pillared layered materials UV–Vis spectroscopy H2-TPR Catalysis Industrial Chemistry/Chemical Engineering Organometallic Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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