Chromium expanded smectite clay
AssigneeStandard Oil Company (Indiana)
InventorsP. Donald Hopkins, Bernard L. Meyers, Donna M. Van Duch
Life of this patent
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Abstract
Expanded layer, smectite clay having a regular pore structure suitable for catalytic uses and a process for preparing said expanded clay by treating a suspension of commercial smectite clay with a chromium-oligomer solution and subjecting the treated clay to a stabilization heat treatment in an inert gas atmosphere.
Claims13
A process for the preparation of a stabilized, porous expanded layer, smectite clays comprising:
- (a) contacting an aqueous slurry of smectite clay with an aged chromium-oligomer solution,
- (b) separating a product clay from the mixture of step (a),
- (c) drying said product clay, and
- (d) stabilizing said product clay by an inert gas atmosphere heat treatment including a temperature above about 200.degree. C. to effect the production of a stabilized clay, which when contacted with air at a temperature above 300.degree. C. for at least two hours a majority of said clay is maintained in an expanded state.
A process for the preparation of a stabilized, porous expanded layer, bentonite clay comprising:
- (a) contacting an aqueous slurry of bentonite clay with an aged chromium-oligomer solution prepared by reacting chromium nitrate with concentrated ammonia,
- (b) separating a product bentonite clay from step (a),
- (c) drying said product bentonite clay and
- (d) stabilizing said product by an inert gas atmosphere heat treatment at a temperature above about 200.degree. C. to effect the production of a stabilized clay, which when contacted with air at a temperature above 300.degree. C. for at least two hours a majority of said clay is maintained in an expanded state.
A porous catalytic material comprising, a smectite clay having expanded molecular layers, a multiplicity of chromium-base "pillars" interposed between the molecular layers of said smectite clay, said chromium-base "pillars" maintaining the spacing of said expanded molecular layers at a temperature of at least 300.degree. C. in an air atmosphere for 2 hours wherein said material having been produced by a process comprising:
- (a) contacting an aqueous slurry of smectite clay with an aged chromium-oligomer solution,
- (b) separating a product clay from the mixture of step (a),
- (c) drying product clay, and
- (d) stabilizing product clay by an inert gas atmosphere heat treatment including a temperature above about 200.degree. C.
Dependencies are inferred from the claim text.