Supported noble metal nanometer catalyst particles containing controlled (111) crystal face exposure
AssigneeHydrocarbon Technologies, Inc.
InventorsBing Zhou, Michael Rueter
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Abstract
A noble metal nanometer-sized catalyst composition is described along with the method for preparation of the composition. The crystal face of the catalyst contains a preponderance of (111) type crystal phase exposure. The crystal phase exposure is controlled by sequestering the noble metal cation before deposition on a catalyst support. Controlled catalyst face exposition combined with the nanometer scale of the catalyst increases the catalyst selectivity and activity, particularly for hydrogenation and dehydrogenation reactions.
Claims59
A supported noble metal catalyst wherein the noble metal comprises nanometer-sized crystal particles contained on a support material within a matrix comprising a particle-to-support control and binding agent, said particles having a preponderance of (111) type of crystal phase on the face of the noble metal particles.
A method for preparing a supported noble metal catalyst having nanometer-sized crystal particles, said particles having a preponderance of (111) type of crystal phase on the face of the noble metal particles, comprising:
- (a) preparing a solution of a noble metal salt and a metallo-organic sequestering agent;
- (b) treating the solution of sequestered noble metal with a reducing agent;
- (c) impregnating a catalyst support with the reduced noble metal solution;
- and
- (d) activating the catalyst by reducing the impregnated support to yield the nanometer-sized noble metal catalyst having a preponderance of (111) type of crystal phase on the face of the noble metal particles.
A supported metal catalyst, comprising:
- a support material;
- a plurality of metal catalyst particles disposed on the support material, the catalyst particles having a preponderance of (111) type of crystal phase on the face of the metal catalyst particles;
- and
- a control and binding agent comprising at least one type of polymer, oligomer, or organic compound that binds the metal catalyst particles to the support material.
A method of manufacturing a supported metal catalyst, comprising:
- (a) preparing an intermediate catalyst complex by reacting together:
- (i) a plurality of cations of metal catalyst atoms;
- and
- (ii) a control and binding agent comprising a plurality of molecules selected from the group consisting of polymers, oligomers, and organic compounds;
- (b) contacting the intermediate catalyst complex with a support material;
- and
- (c) removing a portion of the control agent to expose a portion of the metal catalyst atoms, thereby yielding a supported catalyst comprising a plurality of metal catalyst particles (i) that are bonded to the support material by a remaining portion of the control and binding agent and (ii) that have a preponderance of (111) type of crystal phase on the face of the metal catalyst particles.
Dependencies are inferred from the claim text.