Method and device for desulphurizing an exhaust-gas recirculation flow

A method for desulphurizing an exhaust-gas recirculation flow of an intern& combustion engine, said exhaust-gas recirculation flow being supplied to a fresh-air side of the internal combustion engine, and ammonia being used for the desuiphurization, the method comprising the steps of:

• branching off a first partial exhaust-gas flow from the exhaust-gas flow of the internal combustion engine;
• supplying to the first partial exhaust-gas flow at least one reactant that splits to form ammonia to form a laden exhaust-gas flow;
• branching the laden exhaust gas flow into an exhaust-gas recirculation flow and an aftertreatment partial flow;
• supplying the exhaust-gas recirculation flow he fresh-air side of the internal combustion engine;
• supplying the aftertreatment partial flow to an exhaust-gas aftertreatment system;
• and
• predefining or varying flow rates of the exhaust-gas recirculation flow and the aftertreatment partial flow as a function of at least one operating parameter defining a respective operating state of the internal combustion engine.