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Development of Heterogeneous Wacker Oxidation Catalysts: The Role of the Support and the Redox Component.

PB94201431

Publication Date	1993
Personal Author	Stobbe-Kreemers, A. W.
Page Count	182
Abstract	The Wacker process is a liquid phase catalytic process for the direct oxidation of ethene to acetaldehyde. The homogeneous catalyst consists of an aqueous solution of palladium(II) chloride and copper(II) chloride, with copper(II) chloride acting as a co-catalyst for the in situ reoxidation of palladium. The most important drawbacks are the lower reaction rate of higher alkenes and the increased production of (undesired) chlorinated side products. To overcome these disadvantages several attempts have been made to develop a heterogeneous version of the process in which alkenes are oxidized in the gas phase. One of the objectives of the research described in this thesis was to further investigate and explain the influence of the support and of the redox component activity of the catalyst. The work described in this thesis shows that it is possible to oxidize 1-butene in the gas phase over a heterogeneous catalyst with high selectivity and a good activity. The Heteropolyanion (HPA) and Palladium salts of heteropolyanions (PdHPA) catalysts appear to be the most promising heterogeneous catalysts. Their initial activity is of the same order of magnitude as the activity of the homogeneous Wacker catalyst.
Keywords	Oxidation Catalysis Heterogeneity Alkene hydrocarbons Reaction kinetics Surface properties Partial pressure Titanium dioxide Palladium inorganic compounds Aluminum oxide Vanadates Theses Foreign technology Wacker oxidation Redox components HPA(Heteropoly anions)
Source Agency	Netherlands Participating Organizations
NTIS Subject Category	99F - Physical & Theoretical Chemistry 99B - Industrial Chemistry & Chemical Process Engineering
Corporate Authors	Technische Univ. Delft (Netherlands).
Supplemental Notes	Summary in Dutch. See also PB92-127299.
Document Type	Thesis
Title Note	Doctoral thesis.
NTIS Issue Number	199421

Development of Heterogeneous Wacker Oxidation Catalysts: The Role of the Support and the Redox Component.

Development of Heterogeneous Wacker Oxidation Catalysts: The Role of the Support and the Redox Component.
PB94201431

Publication Date	1993
Personal Author	Stobbe-Kreemers, A. W.
Page Count	182
Abstract	The Wacker process is a liquid phase catalytic process for the direct oxidation of ethene to acetaldehyde. The homogeneous catalyst consists of an aqueous solution of palladium(II) chloride and copper(II) chloride, with copper(II) chloride acting as a co-catalyst for the in situ reoxidation of palladium. The most important drawbacks are the lower reaction rate of higher alkenes and the increased production of (undesired) chlorinated side products. To overcome these disadvantages several attempts have been made to develop a heterogeneous version of the process in which alkenes are oxidized in the gas phase. One of the objectives of the research described in this thesis was to further investigate and explain the influence of the support and of the redox component activity of the catalyst. The work described in this thesis shows that it is possible to oxidize 1-butene in the gas phase over a heterogeneous catalyst with high selectivity and a good activity. The Heteropolyanion (HPA) and Palladium salts of heteropolyanions (PdHPA) catalysts appear to be the most promising heterogeneous catalysts. Their initial activity is of the same order of magnitude as the activity of the homogeneous Wacker catalyst.
Keywords	Oxidation Catalysis Heterogeneity Alkene hydrocarbons Reaction kinetics Surface properties Partial pressure Titanium dioxide Palladium inorganic compounds Aluminum oxide Vanadates Theses Foreign technology Wacker oxidation Redox components HPA(Heteropoly anions)
Source Agency	Netherlands Participating Organizations
NTIS Subject Category	99F - Physical & Theoretical Chemistry 99B - Industrial Chemistry & Chemical Process Engineering
Corporate Authors	Technische Univ. Delft (Netherlands).
Supplemental Notes	Summary in Dutch. See also PB92-127299.
Document Type	Thesis
Title Note	Doctoral thesis.
NTIS Issue Number	199421