Characterization of acidic and basic properties of heterogeneous catalysts by test reactions

Classification of catalysts according to their active sites can be done by catalytic test reactions. In contrast to acid catalysed test reactions which are actually well understood there is a need to study base catalysed reactions in detail. Therefore reactions in gas phase like conversion of methyl butynol (MBOH) and isopropanol and in liquid phase like Knoevenagel condensation were investigated. It was found that the conversion of isopropanol yields propene as the only product over the catalysts which have no redox ability while the reaction was sensitive to nature of the active centers in case of redox active catalysts. For the conversion of MBOH, the formation of MBYNE was an indication for acidic sites in the investigated solids whereas acetone and acetylene were found to be the products of the basic pathway. In addition, a new mechanism was proposed for the formation of the product 3-methyl-3-butyn-2-on (MIPK) requiring not only strong acid sites but also a special structural environment. A comparison between MBOH conversion and Knoevenagel condensation shows that the two test reactions used in the present study characterize the same basic properties proving the explanatory power of the test reaction.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Oldenburg

Year

2004

Author dc:creator

• Alsawalha, Murad

• [Keine Schlagwörter von Autor/in vergeben.]

Repository record source_url

http://oops.uni-oldenburg.de/113

OAI identifier oai:identifier

oai:oops.uni-oldenburg.de:113