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AssigneeBASF SE
InventorsNico F. Fischer, Diana C. Galeano Nunez, Michael Krämer, Markus Schubert, Jürgen Zühlke, Hans-Martin Allmann
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The present invention relates to a catalyst system for oxidation of o-xylene and/or naphthalene to phthalic anhydride (PA), comprising a plurality of catalyst zones arranged in succession in the reaction tube, which have been produced using antimony trioxide comprising a noticeable proportion of senarmontite wherein some of the primary crystallites have a size of less than 200 nm. The present invention further relates to a process for gas phase oxidation, in which a gas stream comprising at least one hydrocarbon and molecular oxygen is passed through a catalyst system which comprises a plurality of catalyst zones arranged in succession in the reaction tube and which has been produced using an antimony trioxide comprising a noticeable proportion of senarmontite wherein some of the primary crystallites have a size of less than 200 nm.
A catalyst system comprising a plurality of catalyst zones is arranged in succession in the reaction tube, which is produced using an antimony trioxide having a senarmontite content of at least 20% by weight and where the senarmontite primary crystallites have a polymodal size distribution, wherein between 10% and 80% by weight have a primary crystallite size of <200 nm and a median primary crystallite size of <150 nm.
A catalyst system comprising a plurality of catalyst zones is arranged in succession in the reaction tube, which is produced using an antimony trioxide having a senarmontite content of at least 20% by weight and where the senarmontite primary crystallites have a polymodal size distribution, wherein between 10% and 80% by weight have a primary crystallite size of <200 nm and a median primary crystallite size of <150 nm and, wherein the senarmontite primary crystallites have a bimodal size distribution.
Dependencies are inferred from the claim text.