US Patent 7744824 On-board fuel desulfurization unit

The athermal sorbent bed regeneration system of the present invention includes a main fuel supply, at least one sorbent bed, a source of microwave energy, and a secondary fuel supply. The main fuel supply has a first concentration of an impurity and the secondary fuel supply has a second concentration of the impurity that is less than the first concentration of the impurity. The sorbent bed adsorbs the impurity. The microwave energy source regenerates the sorbent bed for reuse.