Preparation of Porous Carbons from Petroleum Pitch and Polyaniline by Thermal Treatment for Methane Storage

Abstract

The methane storage capacity of two series of activated carbons, obtained from a graphitizable (petroleum pitch) and a non-graphitizable precursor (polyaniline), has been evaluated after different thermal treatments. Both samples have been pyrolyzed and subsequently activated with KOH to obtain a highly developed microporous structure. After the synthesis, samples have been heat-treated at different temperatures, between 1000ºC and 1500ºC, to introduce structural changes that could have an effect in two parameters defining the methane adsorption capacity: the porosity and the density.The physicochemical characterization of the samples has shown that the activation process destroys the pre-graphitic structure, with a development of microporosity.However, during the subsequent thermal treatment, the graphitic order can be partially recovered, especially with the graphitizable material, together with a decrease in the micropore volume and an enhancement of the density. The electrical conductivity of the activated carbon obtained from a graphitizable precursor improves much more with an increase in the temperature of the thermal treatment than that of the activated carbon

Direct synthesis of organic salt-derived porous carbons for enhanced CO2 and methane storage

“…The carbons have volumetric uptake of 224 to 230 cm 3 (STP) cm −3 at 35 bar and 25 °C, which is remarkable in the context of previous reports for carbons and other porous materials. 1–5,9,24,26,57–62 The performance of the PPI-derived carbons is comparable to that of the best-performing porous carbons to date, i.e. , activated carbons derived from date seeds ( Phoenix dactylifera ) or cloves, which store up to 222 or 235 cm 3 (STP) cm −3 , respectively, at 25 °C and 35 bar.…”

Pitch-Derived Soft-Carbon-Wrapped NaVPO4F Composite as a Potential Cathode Material for Sodium-Ion Batteries

“…It contains CO (carbonyl groups), C–OH or C– O–C (hydroxyl or ether), and OC–O (anhydride, lactone, or carboxylic acids groups) functional groups. These functional groups may contribute to the OH or metal carbonate peak at 533.6 eV in XPS spectra. , Further, the sharp peak at 688.05 eV indicates the presence of F – (Figure c). As shown in Figure e, the peaks that appear at 517 and 524 eV correspond to V 2p 3/2 and V 2p 1/2 , respectively, and assigned to the V 3+ oxidation state in the 15-SC@NVPF sample.…”

Manufacture of Carbon Materials with High Nitrogen Content

“…In principle, this partially contradicts previous studies where they conclude that the presence of amines improves CO 2 adsorption, although the main factor remains the microporosity of the sample [ 5 ]. However, some authors have reported that the presence of nitrogen does favor CO 2 capture [ 6 , 7 ], but their synthetic method is completely different. Some authors have developed other types of strategies to generate carbons doped with nitrogen, basically using a ball mill, where they jointly grind a carbon precursor such as graphene oxide and melamine, also synthesize C 3 N 4 in a similar way, where they show that the new generated material ostensibly improves the catalytic properties in the ORR [ 8 , 9 , 10 ].…”