Device and procedure for the production of ammonia

A method to produce ammonia as a reducing agent for the selective catalytic reduction (SCR) of nitrogen oxides in an exhaust gas of a combustion source, the method comprising:

• producing a nitrogen oxide and one of a hydrogen and a hydrogen-carbon monoxide-mixture in alternating nitrogen oxide and hydrogen production phases in a reactor comprising a nitrogen oxide production unit configured to produce the nitrogen oxide connected in series with a hydrogen production unit configured to produce the hydrogen, wherein the reactor is separated from the combustion source and its exhaust gas duct;
• storing the nitrogen oxide in a storage catalytic converter connected in series with the reactor;
• delivering the one of the hydrogen and the hydrogen-carbon monoxide-mixture to the storage catalytic converter;
• converting the one of the hydrogen and the hydrogen-carbon monoxide-mixture and the stored nitrogen oxide catalytically to ammonia in the storage catalytic converter;
• and
• admixing the ammonia with the exhaust gas in the direction of flow in front of a SCR-catalytic converter.