An adsorption device for compressed gas or a non-compressed gas, is provided with a vessel with an inlet for the supply of a compressed gas or a non-compressed gas to be treated, and an outlet for treated gas and an adsorption element is affixed in the vessel. The adsorption element extends along the flow direction of the compressed gas or the non-compressed gas to be treated, between the inlet and the outlet. The adsorption element has a monolithic supporting structure that is at least partially provided with a coating that contains an adsorbent.