A method for forming an adsorptive carbonaceous shaped body comprising the following steps: a) providing an extrudable composition comprising a1) a carbon precursor composed of particles comprising a halogenated polymer having a melting point, a2) a solvent and a3) 0.1 to 8 wt%, based on the weight of the carbon precursor a1), of a processing aid selected from polysaccharides, polysaccharides derivatives, polyalkylene oxides, polyvinyl alcohol or polyvinyl alcohol derivatives obtained by acetalation of polyvinyl alcohol or mixtures thereof, wherein polysaccharides derivatives are polysaccharides in which the hydrogen atoms of the hydroxyl groups in the repeating unit of the polysaccharide have been replaced, partly or wholly, by other atoms or groups such as alkyl groups, carboxyalkyl or hydroxyalkyl groups, wherein the solubility of the processing aids a3) in the solvent a2) is at least 1g/l whereas the solubility of the component a1) in the solvent a2) is at most 0.1 g/l and the ratio of the solubilities of the processing aid a3) and of the carbon precursor a1) in the solvent a2) is at least 10; b) extruding the composition of step a) through a die to obtain a shaped green body c) drying the obtained shaped green body, and d) causing the pyrolysis of the halogenated polymer in the dried green body obtained in step c) to obtain an adsorptive carbonaceous shaped body; wherein the content of the particles comprising the halogenated polymer with regard to the total weight of the extrudable composition excluding the solvent content and the amount of processing aid is at least 65 wt. %. a) providing an extrudable composition comprising a1) a carbon precursor composed of particles comprising a halogenated polymer having a melting point, a2) a solvent and a3) 0.1 to 8 wt%, based on the weight of the carbon precursor a1), of a processing aid selected from polysaccharides, polysaccharides derivatives, polyalkylene oxides, polyvinyl alcohol or polyvinyl alcohol derivatives obtained by acetalation of polyvinyl alcohol or mixtures thereof, wherein polysaccharides derivatives are polysaccharides in which the hydrogen atoms of the hydroxyl groups in the repeating unit of the polysaccharide have been replaced, partly or wholly, by other atoms or groups such as alkyl groups, carboxyalkyl or hydroxyalkyl groups, wherein the solubility of the processing aids a3) in the solvent a2) is at least 1g/l whereas the solubility of the component a1) in the solvent a2) is at most 0.1 g/l and the ratio of the solubilities of the processing aid a3) and of the carbon precursor a1) in the solvent a2) is at least 10; a1) a carbon precursor composed of particles comprising a halogenated polymer having a melting point, a2) a solvent and a3) 0.1 to 8 wt%, based on the weight of the carbon precursor a1), of a processing aid selected from polysaccharides, polysaccharides derivatives, polyalkylene oxides, polyvinyl alcohol or polyvinyl alcohol derivatives obtained by acetalation of polyvinyl alcohol or mixtures thereof, wherein polysaccharides derivatives are polysaccharides in which the hydrogen atoms of the hydroxyl groups in the repeating unit of the polysaccharide have been replaced, partly or wholly, by other atoms or groups such as alkyl groups, carboxyalkyl or hydroxyalkyl groups, wherein the solubility of the processing aids a3) in the solvent a2) is at least 1g/l whereas the solubility of the component a1) in the solvent a2) is at most 0.1 g/l and the ratio of the solubilities of the processing aid a3) and of the carbon precursor a1) in the solvent a2) is at least 10; b) extruding the composition of step a) through a die to obtain a shaped green body c) drying the obtained shaped green body, and d) causing the pyrolysis of the halogenated polymer in the dried green body obtained in step c) to obtain an adsorptive carbonaceous shaped body;