Restructured iron oxide for use in iron oxide catalysts
AssigneeShell Oil Company
InventorsStanley Nemec Milam, Brent Howard Shanks
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Abstract
In one aspect of the invention, a composition is presented comprising restructured iron oxide particles. A method is also presented for restructuring iron oxide particles to form low surface area iron oxide particles. In this method, iron oxide particles are contacted with an effective mount of a restructuring agent and are then heated until restructuring occurs.
Claims8
In a method of preparing iron oxide catalysts by mixing iron oxide particles with one or more promoters, forming a catalyst from the mixture, and calcining said catalyst, the improvement comprising restructuring the iron oxide particles prior to mixing the iron oxide particles with one or more promoters by a process comprising the steps of:
- (a) contacting the iron oxide particles with a restructuring agent comprising a substance including an element selected from the group consisting of Mo, Cu, Ca, Zn, Mn, Sn, Ti, Bi, Co, Ce, W, Cr, Mg, and V, and
- (b) heating the iron oxide particles in contact with said restructuring agent of step a at least until iron oxide particles are formed which are essentially equant and have BET surface areas less than about 1.9 m.sup.2 /gram, particle lengths of 0.3-3 .mu.m and particle breadths of 0.2-2 .mu.m.
Dependencies are inferred from the claim text.