Exhaust gas treatment system for an ammonia-containing exhaust gas

A method of treating an ammonia-containing exhaust gas, the method comprising:

• (i) providing an exhaust gas treatment system for the treatment of an ammonia-containing exhaust gas, the exhaust gas treatment system comprising:
• a first gas inlet for providing a flow of ammonia-containing exhaust gas;
• a second gas inlet for providing a flow of heated gas;
• a plurality of sorbent beds comprising a copper-doped small-pore zeolite;
• an exhaust gas outlet;
• and
• a valve system configured to establish independently for each sorbent bed fluid communication in a first or second configuration, wherein:
• i) in the first configuration a flow of ammonia-containing exhaust gas from the first gas inlet contacts the sorbent bed at a temperature of less than 50° C. for storing the ammonia and then passes to the exhaust gas outlet;
• and
• ii) in the second configuration a flow of heated gas from the second gas inlet contacts the sorbent bed and then passes to the exhaust gas outlet, wherein the flow of heated gas maintains the sorbent bed at a temperature of at least 300° C.;
• wherein the valve system is configured to ensure that at least one sorbent bed is in the first configuration,
• and wherein, the exhaust gas treatment system comprises a control module for controlling the valve system and the flow of heated gas, the control module having an operation mode configured to heat each sorbent bed to the temperature of at least 300° C. with a heating profile reaching 200° C. in 60 minutes or less when switching each sorbent bed from the first configuration to the second configuration,
• wherein the method comprises:
• (i) contacting one or more sorbent beds, each in the first configuration, with a flow of ammonia-containing exhaust gas at a temperature of less than 50° C., thereby storing the ammonia;
• and
• (ii) intermittently switching at least one sorbent bed from the first configuration to the second configuration to heat the sorbent bed to the temperature of at least 300° C. with a heating profile reaching 200° C. in 60 minutes or less, wherein at least one sorbent bed is in kept in the first configuration.