The pore structure of the new adsorbent prepared from carbon-containing residues after catalytic carbon dioxide reforming of lignin of wood origin and the features of m-cresol chemisorption on this adsorbent were studied. The main step of the pore structure formation is treatment of the iron-containing carbon residue with carbon dioxide in a plasma catalytic mode, stimulated by microwave radiation. Iron-containing clusters were formed on the surface of the initial lignin and were used as a catalyst in the first step of its processing. The sorbent has a developed porous structure. The total pore volume is 0.65 cm(3)/g, with the micropore volume of 0.18 cm(3)/g and mesopore volume of 0.42 cm(3)/g. The adsorbent is characterized by unimodal distribution of adsorption pores with respect to effective radii with the diameter of 3.8 nm. The m-cresol adsorption dynamics was studied in situ by IR spectroscopy. The adsorption involves chemical transformation of cresol with the formation of Ph-O-C bonds between the phenyl ring of cresol and terminal (carbon or oxygen) atoms of the adsorbent.