In the present work, the thermogravimetric characterization of the sorption of carbon dioxide on zeolites from fly ash was presented. Samples of fly ash were obtained from the Turow Power Station in Poland. Fly ash was chemically analyzed and used to prepare the zeolitic material. The synthesis processes were run using the classic alkaline conversion and the method of fusion with sodium hydroxide prior to the hydrothermal reaction. During the modification, the zeolites Na-PI and Na-A were synthesized. The zeolites samples for dehydration were heated up to 500 degrees C and after stabilization of measurement conditions, sorption of CO2 was carried out isothermally in a flow of a mixture of gasses (O-2 (10 vol.%), CO2 (10 vol.%), N-2 (80 vol.%)). Conducted in the work research of CO2 adsorption on zeolites synthesized from fly ash showed that these materials are characterized by high CO2 adsorption capacity. Sample containing Na-A zeolite can take CO2 in an amount equivalent to 5.2 wt.% sample weight within 120 min. The significant CO2 adsorption on Na-A zeolite, results from the fact that this zeolite has large surface area (about 100 m(2)/g) and large pore volume (about 0.27 cm(3)/g). (C) 2005 Elsevier B.V. All rights reserved.