Publication

Partial oxidation of toluene to benzaldehyde and benzoic acid over model vanadia/titania catalysts

Albert Renken, Lioubov Kiwi, Fabio Rainone
2003
Conference Papers

Abstract

Pure and K-doped vanadia/titania catalysts have been studied by transient response method and in situ DRIFTS during toluene partial oxidn. They were characterized by FT-Raman spectroscopy, TPR, TPD of pyridine and XPS. In order to elucidate the role of different vanadia species for catalysis, the study was carried out in aerobic and anaerobic conditions. Monolayer species (monomeric and polymeric) are responsible for the catalytic activity and selectivity. Bulk V2O5 present in the catalysts with high concn. of vanadia supplies oxygen for the monolayer species easily reducible by toluene. This oxygen is necessary for the products formation and desorption in the absence of gaseous oxygen. Potassium at low concn. diminishes the total rate of toluene oxidn. and suppresses deactivation provided by cocking. This is due to transformation of the polymeric species to the not active K-doped monomeric ones. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/6f5a5259-9b6b-4025-b129-7ae1ad91a0fb

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Albert Renken, Lioubov Kiwi, Fabio Rainone
2003
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6f5a5259-9b6b-4025-b129-7ae1ad91a0fb

About this result

Related concepts (32)

Catalysis

Catalysis (kəˈtæləsɪs) is the process of change in rate of a chemical reaction by adding a substance known as a catalyst (ˈkætəlɪst). Catalysts are not consumed by the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recycles quickly, very small amounts of catalyst often suffice; mixing, surface area, and temperature are important factors in reaction rate. Catalysts generally react with one or more reactants to form intermediates that subsequently give the final reaction product, in the process of regenerating the catalyst.

Degree of polymerization

The degree of polymerization, or DP, is the number of monomeric units in a macromolecule or polymer or oligomer molecule. For a homopolymer, there is only one type of monomeric unit and the number-average degree of polymerization is given by , where Mn is the number-average molecular weight and M0 is the molecular weight of the monomer unit. For most industrial purposes, degrees of polymerization in the thousands or tens of thousands are desired.

Polymer

A polymer (ˈpɒlᵻmər; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function.

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