Method for applying a wash coat suspension to a carrier structure
First Claim
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1. A method for applying a washcoat suspension to a support structure, wherein the method is carried out using a device (10) which is set up to produce, by means of a process gas (40) a fluid bed of support structures in which the support structures circulate elliptically or toroidally said method comprising the steps of:
- a) charging the device (10) with support structures and producing a support-structure fluid bed by means of a process gas (40), wherein the support structures circulate in the fluid bed elliptically or toroidally;
b) impregnating the support structures with a washcoat suspension by spraying the support structures circulating elliptically or toroidally in the fluid bed with the washcoat suspension;
c) drying the support structures sprayed with the washcoat suspension; and
d) optionally calcining the support structures loaded with the solids contents of the washcoat suspension.
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Abstract
A method for applying a washcoat suspension to a support structure. To provide coatings with largely uniform thickness starting from washcoat suspensions, the method uses a device (10) set up to produce, by means of a process gas (40), a fluid bed of support structures in which the support structures circulate elliptically or toroidally, the method comprising the steps of:
- a) charging the device (10) with support structures and producing a support-structure fluid bed by means of a process gas (40), wherein the support structures circulate in the fluid bed elliptically or toroidally, preferably toroidally;
- b) impregnating the support structures with a washcoat suspension by spraying the support structures circulating elliptically or toroidally in the fluid bed with the washcoat suspension;
- c) drying the support structures sprayed with the washcoat suspension; and
- d) optionally calcining the support structures loaded with the solids contents of the washcoat suspension.
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Citations
32 Claims
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1. A method for applying a washcoat suspension to a support structure, wherein the method is carried out using a device (10) which is set up to produce, by means of a process gas (40) a fluid bed of support structures in which the support structures circulate elliptically or toroidally said method comprising the steps of:
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a) charging the device (10) with support structures and producing a support-structure fluid bed by means of a process gas (40), wherein the support structures circulate in the fluid bed elliptically or toroidally; b) impregnating the support structures with a washcoat suspension by spraying the support structures circulating elliptically or toroidally in the fluid bed with the washcoat suspension; c) drying the support structures sprayed with the washcoat suspension; and d) optionally calcining the support structures loaded with the solids contents of the washcoat suspension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification