Air-oxidation of phenolic resin aerogels: backbone reorganization, formation of ring-fused pyrylium cations, and the effect on microporous carbons with enhanced surface areas

This paper is a thorough investigation of the chemical transformations during pyrolytic conversion of phenolic resins to carbons, and reports that all carbons obtained from main-stream phenolic resins including phloroglucinol-formaldehyde (FPOL), phloroglucinol-terephthalaldehyde (TPOL), resorcinol-formaldehyde (RF), and phenol-formaldehyde (PF) contain fused pyrylium rings and charge-compensating phenoxides. Those four phenolic resins were prepared via a fast HCl-catalyzed process as low-density nanostructured solids classified as aerogels, which, owing to their open porosity, allowed air circulation through their bulk. In that regard, the first step of this study was the air-oxidation of those phenolic resin aerogels at 240 degrees C. In FPOL and TPOL aerogels, that air-oxidation step kicked off a cascade of reactions leading to ring-fusion aromatization and formation of pyrylium O+-heteroaromatic rings in every repeat unit of the polymeric backbone. Despite the complexity of the process, those structural forms were well-defined, and were retained through pyrolytic carbonization (800 degrees C). Under the same conditions (240 degrees C/air), RF and PF aerogels did not undergo aromatization; instead, they just went through an autooxidation-like process that converted the -CH2- bridges between phenolic moieties into carbonyls (C=O). Importantly, however, upon further stepwise pyrolysis under Ar, by 600 degrees C all four systems (TPOL, FPOL, RF and PF), irrespective of whether they had been previously oxidized or not, converged to a common chemical composition. Thereby, carbon produced by pyrolysis of phenolic resins at 800 degrees C always contains fused pyrylium rings. All chemical analysis relied on FTIR, solid-state C-13 NMR, XPS and CHN analysis. The only and significant difference made by the low-temperature (240 degrees C) air-oxidation step was identified with the surface areas of carbons from aromatizable systems (TPOL and FPOL), which were higher than those from direct pyrolysis of as-prepared aerogels. Upon further reactive etching with CO2, those surface areas went as high as 2778 +/- 209 m(2) g(-1). Those findings are directly relevant to high surface area carbons for gas sorption (e.g., capture and sequestration of CO2) and ion exchange materials.