Recently, we reported about the template assisted preparation of porous carbons using porous concrete as the template [1, 2] and its insitu activation during the synthesis [3]. Due to its good workability, porous concrete is a suitable template to produce carbon monoliths with defined geometrical shape such as cubes or cylinders. The primary pore system of the carbons - created by the template effect - is mainly macroporous. It was now the idea to create a secondary system of micropores through a post synthesis treatment. The carbon monoliths, obtained from the template assisted synthesis, were treated with an aqueous solution of potassium hydroxide and heated up to 1073 K. This procedure is based on a method to produce powdery activated carbon as reported previously [4]. The obtained carbon monoliths possess large surface areas and high micropore volume.
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