Ammonia precursor generating system for use in a vehicle

It is proposed an ammonia precursor generating system comprising: a storage compartment (110) storing at least ammonia precursor granules; a dissolving compartment (120) adapted for storing an ammonia precursor solution, and for dissolving ammonia precursor granules in the ammonia precursor solution; a transfer means (130) configured for transferring ammonia precursor granules from the storage compartment to the dissolving compartment.