NOx STORAGE MATERIALS FOR SENSOR APPLICATIONS
AssigneeJohnson Matthey Public Limited Company
InventorsHai-Ying Chen, Shadab Mulla, Todd Howard Ballinger
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Abstract
A NOx storage material comprises a support, a potassium salt impregnated on the support, the potassium impregnated on the support is promoted with a platinum group metal, and wherein the NOx storage material has an electrical property which changes based on the amount of NOx loading on the NOx storage material. An apparatus for direct NOx measurement includes a sensor coated with the NOx storage material. A method of determining NOx flux in a NOx containing gas comprises exposing the gas to the apparatus and converting a signal developed by the apparatus to a signal representative of the NOx flux.
Claims30
A NOx storage material comprising:
- a support;
- and
- a potassium salt impregnated on the support, wherein the potassium impregnated on the support is promoted with a platinum group metal, and
- wherein the NOx storage material has an electrical property which changes based on an amount of NOx loading on the NOx storage material.
An apparatus for direct NOx measurement comprising:
- a NOx storage material comprising a support and a potassium salt impregnated on the support, wherein the potassium impregnated on the support is promoted with a platinum group metal, wherein the NOx storage material has an electrical property which changes based on an amount of NOx loading on the NOx storage material, and
- a sensor coated with the NOx storage material for providing a signal in response to the electrical property.
A composition for application to a sensor and, upon drying and calcining, for storing NOx, said composition comprising an aqueous mixture of a support, a potassium salt, and a salt of a platinum group metal, wherein the composition, upon drying and calcining, has an electrical property which changes based on an amount of NOx loading on the dried composition.
A method of determining NOx flux in a NOx containing exhaust gas comprising the steps of:
- exposing the NOx containing exhaust gas to an apparatus comprising:
- (1) a NOx storage material comprising a support and a potassium salt impregnated on the support, wherein the potassium impregnated on the support is promoted with a platinum group metal, wherein the NOx storage material has an electrical property which changes based on an amount of NOx loading on the NOx storage material, and (2) a sensor coated with the NOx storage material for providing a first signal in response to the electrical property;
- and
- converting the first signal to a second signal representative of the NOx flux in the NOx containing exhaust gas.
Dependencies are inferred from the claim text.