Gas adsorber

The invention discloses a gas adsorber which is characterized in that the gas adsorber comprises a shell, an inner adsorption area and an outer adsorption area, the inner adsorption area is arranged in the shell and provided with a gas inlet part, the outer adsorption area wraps the inner adsorption area, and the outer adsorption area is provided with a feed port for adding an outer adsorption material into the outer adsorption area as required; the shell comprises a top plate, a bottom plate, an inner sleeve and an outer sleeve, the inner sleeve and the outer sleeve are fixedly connected to the bottom plate, the inner sleeve and the outer sleeve are coaxially arranged in a sleeved mode, and the top plate covers the top of the inner sleeve and the top of the outer sleeve; the outer adsorption area is formed in the area between the inner sleeve and the outer sleeve, the inner adsorption area is formed in the inner side area of the inner sleeve, and an inner adsorption material is arranged in the inner adsorpti