Catalyst or membrane precursor systems, catalyst or membrane systems, and method of preparing such systems
AssigneesGastec N. V., Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO
InventorsAletta Mulder, Francien van Looy, John W. Geus
Life of this patent
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Abstract
A catalyst or membrane system comprising a thermostable, high porous layer applied on a less porous or nonporous support layer, in particular on the inner surface of a monolith or sintered metal body, in the inner pores of .alpha.-alumina, of a carbon carrrier or on the surface of a ceramic membrane. The catalyst system can be prepared by spreading a solution of a metallo-organic compound on the inner surface of the support layer and then converting the organometallic compound into the oxide. In the high-porous layer thus obtained, a catalytically active material can be applied in the conventional manner.
Claims18
A catalyst or membrane precursor system comprising a thermostable, continuous high-porous layer applied to a less porous or nonporous support layer, said thermostable, continuous high-porous layer formed from a precursor of an oxide in a non-aqueous solvent.
A catalyst or membrane system comprising a thermostable, continuous high-porous layer applied to a less porous or nonporous support layer comprising a uniform distribution of a catalytically active material in the high porous layer, said thermostable, continuous high-porous layer formed from a precursor of an oxide in a non-aqueous solvent.
A catalyst or membrane system comprising a thermostable, continuous high-porous layer applied to a less porous or nonporous support layer comprising a uniform distribution of a catalytically active material in the high-porous layer,
- said system obtainable by applying a precursor of silicon oxide in a non-aqueous solvent on the surface of the support layer, evaporating the solvent and calcining the silicon oxide precursor to provide said catalyst or membrane system or precursor system;
- wherein the support layer is the inner surface of a monolith or sintered metal body and selected from the group consisting of:
- an .alpha.-Al.sub.2 O.sub.3 material;
- a carbon carrier;
- and a coarse-porous surface of a precursor for a ceramic membrane.
A method of making a catalyst or membrane precursor system or catalyst or membrane system, comprising the steps of:
- providing a non-aqueous solution of a suitable organic compound in a solvent;
- spreading said non-aqueous solution on the surface of a support layer;
- drying said non-aqueous solution to remove said solvent;
- and
- oxidizing said organic compound in an oxidizing medium to convert said organic compound into the corresponding oxide, said oxide forming a thermostable, continuous high-porous layer.
A method of making a catalyst or membrane precursor system or catalyst or membrane system, comprising the steps of:
- providing a high-viscous, non-aqueous solution of a polysiloxane in an anhydrous solvent;
- providing a porous support layer;
- spreading said high-viscous, non-aqueous solution onto a surface of said porous support layer, said spreading step including the step of impregnating said non-aqueous solution into said support layer;
- drying said high viscous, non-aqueous solution to remove said solvent;
- and
- thermally oxidizing said polysiloxane in an oxidizing medium to convert said polysiloxane into the corresponding oxide, said oxide forming a thermostable, continuous high-porous layer.
A method of making a catalyst or membrane precursor system or catalyst or membrane system, comprising the steps of:
- providing a low-viscous, non-aqueous solution of a polysiloxane in an anhydrous solvent,
- providing a porous support layer, the pores of said porous support layer being filled with water;
- spreading said low-viscous, non-aqueous solution on the surface of said support layer, said spreading step including the step of impregnating said non-aqueous solution into said support layer;
- drying said low-viscous, non-aqueous solution to remove said solvent;
- and
- thermally oxidizing said polysiloxane in an oxidizing medium to convert said polysiloxane into the corresponding oxide, said oxide forming a thermostable, continuous high-porous layer.
Dependencies are inferred from the claim text.