Adsorption of carbon dioxide by functional carbon materials obtained by pyrolysis of polyphenylenepyridines

Le résumé fourni par la source

The development of new methods for obtaining nitrogen-containing sorbents to bind carbon dioxide is an important task to combat climate change, minimize a carbon trace and obtain industrially valuable products in heterogeneous catalytic processes. In this regard, the effect of the temperature of pyrolysis of polyphenylenepyridines on the chemical composition and sorption. The X-ray photoelectron spectroscopy (XPS) method was used to demonstrate the formation of nitrogen-containing products of high-temperature (800 − 1000 °C) carbonization of polyphenylenepyridines and polybiphenylenepyridines containing surface hydroxyl, ether, and carboxyl functional groups. According to the study of carbon dioxide adsorption-desorption isotherms, the new materials have a specific surface area of about 1000 m2g−1 and a micropore diameter of up to 0.48 nm (Non-Local Density Functional Theory (NLDFT)). The resulting carbon materials had a high adsorption capacity for carbon dioxide, as well as the ability to cooperatively desorb it in accordance with the second-order kinetic equation. It was shown that the rate of carbon dioxide desorption decreased with increasing pyrolysis temperature used to form nitrogen-containing carbon material. Simultaneously with increasing pyrolysis temperature, a decrease in the mass fraction of nitrogen in the samples was observed with an increase in the adsorption capacity of the formed adsorbents with respect to carbon dioxide. Thus, the increase in the specific surface had a greater effect on the amount of carbon dioxide adsorption than the N/C value ratio did.

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