Manganese oxides and their use in the oxidation of alkanes
AssigneeExxonMobil Chemical Patents Inc.
InventorsHelge Jaensch, Wilfried J. Mortier
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Abstract
Catalytic structures are provided comprising octahedral tunnel lattice manganese oxides ion-exchanged with metal cations or mixtures thereof. The structures are useful as catalysts for the oxidation of alkanes and may be prepared by treating layered manganese oxide under highly acidic conditions, optionally drying the treated product, and subjecting it to ion exchange.
Claims25
A method for producing a 2×2 octahedral manganese oxide structure containing metal cations, which process comprises treating a layered manganese oxide under highly acidic conditions comprising a pH not greater than 5, to rearrange the oxide to the 2×2 octahedral structure containing free protons, optionally drying the proton-containing structure, and ion exchanging the proton-containing structure with metal cations.
A process for the oxidation of an alkane comprising contacting the alkane with oxygen in the presence of a catalyst system comprising a 2×2 octahedral manganese oxide structure ion-exchanged with one or more metal cations.
A 2×2 octahedral manganese oxide structure ion-exchanged with one or more metal cations.
A structure having the general formula:
- [A16-aMaMn16-aO32]n (I)
- in which:
- A represents a tunnel metal cation in oxidation state +1, +2, +3, +4 or +5, wherein the metal of the cation is selected from the transition metals (Groups 3-12) and metals of Group 1 and Group 2 of the IUPAC Periodic Table of the Elements (1 Nov. 2004);
- M represents a lattice metal cation in oxidation state +1, +2, +3, +4 or +5, wherein the metal of the cation is a transition metal (Group 3-12);
- Mn represents the transition metal, manganese;
- a is a number equal to or greater than zero and less than 16;
- and
- n is a number equal to or greater than 1.
Dependencies are inferred from the claim text.