Solid ammonia storage and delivery material
AssigneeAmminex Emissions Technology A/S
InventorsClaus Hviid Christensen, Tue Johannessen, Ulrich Quaade, Jens Kehlet Nørskov, Rasmus Zink Sørensen
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for the selective catalytic reduction of NOx in waste/exhaust gas by using ammonia provides by heating one or more salts of formula Ma(NH3)nXz, wherein M represents one or more cations selected from alkaline earth metals and transition metals, X represents one or more anions, a represents the number of cations per salt molecule, z represents the number of anions per salt molecule, and n is a number of from 2 to 12, the one or more salts having been compressed to a bulk density above 70% of the skeleton density before use thereof.
Claims20
A method for the selective catalytic reduction of NOx in waste gas containing oxygen by using ammonia and a reduction catalyst, wherein the method comprises providing gaseous ammonia by heating a solid storage medium capable of releasing ammonia and comprising one or more salts of general formula:
- Ma(NH3)nXz,
- wherein M represents one or more cations selected from alkaline earth metals and transition metals, X represents one or more anions, a represents the number of cations per salt molecule, z represents the number of anions per salt molecule, and n is a number of from 2 to 12, the one or more salts having been compressed to a bulk density above 70% of a skeleton density before use thereof, and controlling a release rate of ammonia depending on a content of NOx in the waste gas.
A method for the selective catalytic reduction of NOx in an exhaust gas from a combustion process, wherein the method comprises contacting the exhaust gas with ammonia as reducing agent, the ammonia being provided by desorption of ammonia from one or more salts of general formula:
- Ma(NH3)nXz,
- wherein M represents one or more cations selected from alkaline earth metals and transition metals, X represents one or more anions, a represents the number of cations per salt molecule, z represents the number of anions per salt molecule, and n is a number of from 2 to 12, the one or more salts having been compressed to a bulk density above 70% of a skeleton density before use thereof.
A method for the selective catalytic reduction of NOx in an exhaust gas from a combustion process, wherein the method comprises contacting the exhaust gas with ammonia delivered from an ammonia delivery device that comprises a container having therein one or more salts of general formula:
- Ma(NH3)nXz,
- wherein M represents one or more cations selected from alkaline earth metals and transition metals, X represents one or more anions, a represents the number of cations per salt molecule, z represents the number of anions per salt molecule, and n is a number of from 2 to 12, the one or more salts having been compressed to a bulk density above 70% of a skeleton density before use thereof, and wherein the container comprises one or more closable outlet openings connected to a pipe and further is provided with an element for heating the container and the one or more salts contained therein.
Dependencies are inferred from the claim text.