CO 2 adsorption by coal fly ash zeolite and modified zeolite-templated carbon

Coal fly ash (CFA), as the main by-product of coal-fired power plants, has a high content of silica-aluminium elements that can be used to prepare zeolite by the alkali fusion method with sound CO 2 adsorption capacity. Among the four effect factors of Si/Al, NaOH/CFA, H 2 O/AFP(alkali fusion product), and crystallisation time, NaOH/CFA had the greatest effect on the CO 2 adsorption performance of coal fly ash zeolite (CFAZ), followed by Si/Al and H 2 O/AFP, and crystallisation time had the least effect. The CO 2 adsorption performance of the samples was tested and analysed using the thermal analysis method, the CO 2 adsorption amount of CFAZ reached 4.23 mmol g -1 (30 degrees C, 101 kPa). In addition, the CFAZ and the zeolite-templated carbon (ZTC) adsorption performance is poor at high temperatures. The co-precipitation method modification of CFAZ and ZTC can produce layered double hydroxide derived material, which can adsorb CO 2 at high temperatures reached at 3.35 mmol/g (650 degrees C, 101 kPa). Moreover, ZTC modified with polydivinylbenzene as the hydrophobic material has a sound CO 2 adsorption effect in high-humidity environments. Thus, different adsorbents also could be produced using CFA to capture CO 2 with a wide temperature range between 25 and 650 degrees C.