Abstract
Resorcinol-formaldehyde resin polymer was used as raw material for preparation of carbon spheres. Samples were treated with CO2flow at 850°C by varying activation times. The CO2activation granted better pore development of pore structure. The experimental data of CH4adsorption as a function of equilibrium pressure was fitted by Langmuir and Dubinin-Astakhov (D-A) models. It was concluded that the high surface area and micropore volume of carbon spheres did unequivocally determine methane capacities. In addition, a thermodynamic study of the heat of adsorption of CH4on the carbon spheres was carried out. Adsorption of CH4on carbon spheres showed a decrease in the adsorption heat with CH4occupancy, and the heat of adsorption fell from 20.51 to 12.50 kJ/mol at 298 K and then increased to a little higher values at a very high loading (>0.70), indicating that CH4/CH4interactions within the adsorption layer became significant.
Highlights
Energy sources as an alternative to conventional fuels are required for a sustainable energy supply and progressively more strict environmental rules [1, 2]
The N2 adsorption-desorption isotherms, pore size distribution (PSD), and textural characteristics of the pristine sample and the corresponding CO2 activated samples were presented in Figures 2 and 3 and Table 1, respectively
For the activated carbon spheres, the increase in the activation time provoked a progressive increase in N2 adsorption capacity
Summary
Energy sources as an alternative to conventional fuels are required for a sustainable energy supply and progressively more strict environmental rules [1, 2]. The fabrication and tuning of carbonaceous materials such as activated carbons (ACs) and carbon nanotubes [18,19,20] are important research areas with respect to achieving storage of high amounts of CH4 [21,22,23,24,25]. An effective approach for investigating the methane adsorption capacity and tuning the thermodynamics of adsorption is by controlling the pore structure [2, 10, 36, 37]. In the present study, we investigated the effect of the textural characteristics of carbon spheres on their CH4 adsorption capacities. A thermodynamic study of the heat of adsorption of CH4 on the carbon spheres was carried out
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