Methods and systems for testing performance of a catalyst element
AssigneeMiratech Knoxville, LLC
InventorsTracy D. Staller, Steven G. DeCicco, Lisa D. Mitchell, David Matthew Loy, Tom Sughrue
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Abstract
Methods and systems for testing performance of a catalyst element are provided. The catalyst element can be an oxidation catalyst element or a non-selective catalytic reduction catalyst element, where the subject methods and systems are configured for testing under various lambda (λ) conditions. The subject methods and systems find use in a variety of applications where it is desired to test the performance of a catalyst element.
Claims26
A method for testing performance of an oxidation catalyst element or a non-selective catalytic reduction catalyst element, the method comprising:
- mounting a catalyst element in a gas flow path of a system comprising a gas inlet upstream from the catalyst element and a gas outlet downstream from the catalyst element;
- introducing a predetermined quantity of one or more reagent gases into a carrier gas to produce a test gas flowing through the gas flow path of the gas inlet;
- measuring an inlet concentration of the one or more reagent gases in the test gas in the flow path of the gas inlet;
- measuring an outlet concentration of the one or more reagent gases in the test gas in the flow path of the gas outlet;
- and
- determining the performance of the catalyst element by calculating the Destruction and Removal Efficiency (DRE) of the catalyst element for the one or more reagent gases based on the measured inlet concentration of the one or more reagent gases and the measured outlet concentration of the one or more reagent gases,
- wherein, for the oxidation catalyst element, the one or more reagent gases comprise one or more reductant gases, and the test gas flowing into the emissions catalyst element has a λ value of greater than 1, and
- wherein, for the non-selective catalytic reduction catalyst element, the one or more reagent gases comprise one or more reductant gases and one or more oxidant gases, and the test gas flowing into the emissions catalyst element has a λ value of 1 or less including oxygen present in the test gas.
A system for testing performance of an oxidation catalyst element or a non-selective catalytic reduction catalyst element, the system comprising:
- a gas source that provides a flow of a carrier gas through the system;
- a gas inlet to a catalyst element that seals against an upstream surface of the catalyst element;
- a gas outlet from the catalyst element that seals against a downstream surface of the catalyst element;
- a detector that measures a concentration of one or more reagent gases in a test gas upstream from the gas inlet or measures a concentration of the one or more reagent gases in the test gas downstream from the gas outlet;
- and
- a processor that determines the performance of the catalyst element by calculating the Destruction and Removal Efficiency (DRE) of the catalyst element for the one or more reagent gases based on the measured inlet concentration of the one or more reagent gases and measured outlet concentration of the one or more reagent gases,
- wherein, for the oxidation catalyst element, the one or more reagent gases comprise one or more reductant gases, and the test gas flowing into the catalyst element has a λ value of greater than 1, and
- wherein, for the non-selective catalytic reduction catalyst element, the one or more reagent gases comprise one or more reductant gases and one or more oxidant gases, and the test gas flowing into the catalyst element has a λ value of 1 or less including oxygen present in the test gas,
- wherein the cross sectional area of the gas inlet is less than the cross sectional area of the gas outlet.
Dependencies are inferred from the claim text.