Catalyst-coated support, method for the production thereof, a reactor equipped therewith, and use thereof
A catalyst-coated support including a sheetlike support, a primer layer applied thereto and composed of nanoparticles composed of silicon oxide-comprising material, and at least one catalyst layer applied to the primer layer. The layers applied are notable for a particularly good adhesive bond strength and can be used particularly efficiently in heterogeneously catalyzed gas phase reactions, especially in microreactors.
1. A catalyst-coated support comprising a sheetlike support, a primer layer applied thereto by plasma spraying of silicon compounds in an oxidizing atmosphere and comprising nanoparticles of silicon oxide-comprising material, wherein the primer layer has a thickness of 20 to 100 nm, and at least one catalyst layer applied to the primer layer, wherein the at least one catalyst layer has a thickness of 50 μm to 3 mm.
2. The catalyst-coated support as claimed in claim 1 , wherein the primer layer is a layer applied by flame spraying of silicon compounds in an oxidizing atmosphere.
3. The catalyst-coated support as claimed in claim 2 , wherein the silicon compounds are silicon-hydrogen compounds, silicon-carbon compounds or water-soluble silicates.
4. The catalyst-coated support as claimed in claim 1 , wherein the sheetlike support consists of metal or of ceramic.
5. The catalyst-coated support as claimed in claim 1 , wherein the sheetlike support is configured in the form of a sheet, of a tube, of a reactor wall or of a reactor internal.
6. The catalyst-coated support as claimed in claim 1 , wherein the surface of the sheetlike support has been milled, rolled, punched or imprinted.
7. The catalyst-coated support as claimed in claim 1 , wherein the primer layer has a thickness of 30 to 50 nm.
8. The catalyst-coated support as claimed in claim 1 , wherein the silicon oxide-comprising material is SiO x in which x is a rational number of less than or equal to 2.
9. The catalyst-coated support as claimed in claim 1 , wherein the catalyst layer is porous and has such a thickness that reactants can diffuse from the surface down to the support substrate.
10. The catalyst-coated support as claimed in claim 9 , wherein the catalyst layer contains cavities which are irregular cavities with dimensions of greater than 5 μm in at least two dimensions or with cross-sectional areas of at least 10 μm 2 .
11. The catalyst-coated support as claimed in claim 10 , wherein the catalyst layer contains a pore system in which at least 50% of the pore volume is formed by macropores having a diameter of at least 50 nm.
12. A reactor comprising at least one catalyst-coated support as claimed in claim 1 .
13. The reactor as claimed in claim 12 , which is a microreactor.
14. The reactor as claimed in claim 13 , which is usable for heterogeneously catalyzed gas phase reaction and has at least one reaction chamber of which at least one dimension is smaller than 10 mm, at least one surface of the reaction chamber consisting of a coated support comprising a sheetlike support, a primer layer applied thereto by plasma spraying of silicon compounds in an oxidizing atmosphere and comprising nanoparticles of silicon oxide-comprising material, and at least one catalyst layer applied to the primer layer.
15. The reactor as claimed in claim 14 , wherein the coated support is in the form of a tube, of a plate, of a reactor wall or of a reactor internal.