Publication

Role of vanadia species in V2O5/TiO2 catalysts for toluene partial oxidation

Albert Renken, Lioubov Kiwi
2000
Conference Papers

Abstract

The partial oxidn. of toluene over V2O5/TiO2 catalysts is a reaction of industrial interest. In spite of the detailed study of the nature of surface vanadia species, there is an evident lack of the information concerning their reactivity. The present work demonstrates an application of the transient response techniques in combination with in situ DRIFT and FT-Raman spectroscopy for the discrimination of the reactivity of different vanadia species. Catalysts consisting of 0.35-3.7 monolayers of vanadia on titania were studied. In anaerobic conditions, a conversion of toluene to benzaldehyde (BA) with a selectivity close to 100% was found. BA is formed mainly by nucleophilic (O2-) oxygen in isolated monomeric vanadia species, while electrophilic oxygen (O-) present in polymeric and bulk vanadia species is responsible for the formation of carbon oxides. An addn. of potassium was obsd. to increase the yield of BA. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/e7192f33-d941-493f-bd3d-2bbc5325e33f

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Albert Renken, Lioubov Kiwi
2000
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e7192f33-d941-493f-bd3d-2bbc5325e33f

About this result

Related concepts (32)

Ammonia

Ammonia is an inorganic compound of nitrogen and hydrogen with the formula . A stable binary hydride, and the simplest pnictogen hydride, ammonia is a colourless gas with a distinct pungent smell. Biologically, it is a common nitrogenous waste, particularly among aquatic organisms, and it contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to 45% of the world's food and fertilizers. Around 70% of ammonia is used to make fertilisers in various forms and composition, such as urea and diammonium phosphate.

Oxygen

Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is Earth's most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O2.

Toluene

Toluene (ˈtɒl.jui:n), also known as toluol (ˈtɒl.ju.ɒl,-ɔːl,-oʊl), is a substituted aromatic hydrocarbon. It is a colorless, water-insoluble liquid with the odor associated with paint thinners. It is a mono-substituted benzene derivative, consisting of a methyl group (CH3) attached to a phenyl group. As such, its systematic IUPAC name is methylbenzene. Toluene is predominantly used as an industrial feedstock and a solvent.