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• W2055139058 abstract "A series of activated carbons having from 0.8 to 7.2 wt.% of nitrogen substituted for carbon in graphene layer was prepared by steam activation of chars derived from polyacrylonitrile (PAN), oxidized form of polyvinylpyridine (PVPox) and their blends with coal–tar pitch (CTP). Porosity development at 50 wt.% burn-off was monitored using N2 adsorption at −196 °C and the surface chemistry was characterized by elemental analysis, X-ray photoelectron spectroscopy, pH of the point zero charge pHPZC and acid/base titration. Activated carbons from PAN and CTP/PAN blends show a similar moderate porosity development (SBET ∼ 800 m2 g−1). PVPox gives most microporous carbons (SBET ∼ 1400 m2 g−1) but the porosity diminishes with pitch contribution to blend. Substitutional nitrogen effectively enhances the basicity of the carbon surface. pHPZC increases proportionally to nitrogen content and reaches a maximum over 10 for PAN derived carbon of N/C ratio 0.07. Conversely, the maximum number of basic sites from titration with HCl, ∼2 mmol g−1, is found for PVPox carbon with a moderate nitrogen proportion (N/C = 0.025), however, with a superior porosity development. Introduction of nitrogen does not affect the number and distribution of acidic oxygen groups of activated carbon." @default.
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• W2055139058 date "2005-07-01" @default.
• W2055139058 modified "2023-10-16" @default.
• W2055139058 title "Surface chemistry of porous carbons from N-polymers and their blends with pitch" @default.
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• W2055139058 doi "https://doi.org/10.1016/j.micromeso.2005.03.004" @default.
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