期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 59, 期 13, 页码 5775-5785出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b06501
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资金
- MINECO [MAT2016-80285-p]
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 1000 and 1500 degrees C, to introduce structural changes that could have an effect on 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 pregraphitic 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 obtained from a nongraphitizable precursor. It is worth highlighting that the high methane adsorption capacities achieved with some of these samples, reaching values as high as 180 V/V. These values are among the highest reported in the literature so far.
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