Adsorptive filter unit for the purification of gases and/or gas mixtures and/or for the removal of chemical and/or biological substances or noxiants from gases and/or gas mixtures, in particular for use in or as a respiratory filter or gas-mask filter, wherein the filter unit comprises a plurality of filter elements (1, 2) which are different from each other, - wherein the filter unit comprises at least a first filter element comprising a first adsorbent material, wherein the first adsorbent material is selected from granular activated carbon particles, which activated carbon particles are provided with at least one reactive and/or catalytically active component based on a metal or a metal compound, wherein the reactive and/or catalytically active component of the first adsorbent material is based on a combination of (i) copper, (ii) silver, (iii) zinc, (iv) molybdenum, (v) optionally triethylenediamine (TEDA); - wherein the filter unit comprises at least a second filter element arranged downstream of the first filter element and/or arranged after the first filter element with respect to the flow direction in the use-state of the filter unit, wherein the second filter element comprises a second adsorbent material different from the first adsorbent material, wherein the second adsorbent material is selected from metal-organic framework materials (MOFs), wherein the second adsorbent material is present in granular form, and wherein the metal-organic framework material of the second adsorbent material comprises at least one metal selected from the group consisting of Zn, Cu, Ni, Pd, Pt, Ru, Fe, Mn, Ag, Al and Co; - wherein the ratio of the height of the first filter element to the height of the second filter element [ratio h1: h2], each based on the size in parallel to the direction of flow, is in the range of from 3: 1 to 25: 1. - wherein the filter unit comprises at least a first filter element comprising a first adsorbent material, wherein the first adsorbent material is selected from granular activated carbon particles, which activated carbon particles are provided with at least one reactive and/or catalytically active component based on a metal or a metal compound, wherein the reactive and/or catalytically active component of the first adsorbent material is based on a combination of (i) copper, (ii) silver, (iii) zinc, (iv) molybdenum, (v) optionally triethylenediamine (TEDA); (i) copper, (ii) silver, (iii) zinc, (iv) molybdenum, (v) optionally triethylenediamine (TEDA); - wherein the filter unit comprises at least a second filter element arranged downstream of the first filter element and/or arranged after the first filter element with respect to the flow direction in the use-state of the filter unit, wherein the second filter element comprises a second adsorbent material different from the first adsorbent material, wherein the second adsorbent material is selected from metal-organic framework materials (MOFs), wherein the second adsorbent material is present in granular form, and wherein the metal-organic framework material of the second adsorbent material comprises at least one metal selected from the group consisting of Zn, Cu, Ni, Pd, Pt, Ru, Fe, Mn, Ag, Al and Co; - wherein the ratio of the height of the first filter element to the height of the second filter element [ratio h1: h2], each based on the size in parallel to the direction of flow, is in the range of from 3: 1 to 25: 1.