Abstract
Two kinds of typical Activated Carbons (coal based AC and coconut shell based AC) were modified in a flow of N<sub>2</sub> gas has been carried out using a microwave device operating at 2450 MHz and different input power, instead of a conventional furnace. The samples were analyzed by means of low temperature N<sub>2</sub> adsorption, elemental analysis and Boehm titration. The results show that microwave heating is an effective means of activated carbon modification. The temperature of activated carbon increases rapidly under microwave heating and then gradual increase to a quasi-stationary temperature. The pore texture of activated carbon changes slightly after microwave treatment and the two activated carbons still keep rich pore structure. The oxygen functional groups decompose and evolve with the form of CO and CO<sub>2</sub>. This in turn gives rise to a significant decrease in oxygen content. These changes of oxygen contents increase as the microwave input power increases. During microwave treatment, a gradual decrease in the surface acidic functional groups is observed. More important, with the removal of the surface acidic groups, the number of the basic group increased gradually, the activated carbon with oxygen functional groups become basic properties material.
Highlights
Activated carbon is widely used as adsorbents and as catalysts as well as catalyst supports for gasphase and liquid-phase application, due to its extensive surface area, well-developed microspore structure and the presence of functional groups of different types on the surface (Nilgun et al, 2008; Nestor et al, 2004)
The microwave-treated activated carbons were stored in a sealed glass jar, which was purged with N2, in order to prevent the samples form being exposed to air
Carbon and the temperature reached will depend on the fraction of the supplied energy which is adsorbed by activated carbon during microwave treatment
Summary
Activated carbon is widely used as adsorbents and as catalysts as well as catalyst supports for gasphase and liquid-phase application, due to its extensive surface area, well-developed microspore structure and the presence of functional groups of different types on the surface (Nilgun et al, 2008; Nestor et al, 2004). Two kinds of activated carbons (coalbased and coconut shell-based) were treated in an atmosphere of N2 using a microwave device under different input power instead of a conventional heating system. The differences in the Physical and chemical characterization of activated temperatures reached by each sample and its evolution carbon: The pore texture of the activated carbon was during the treatment may be a consequence of the characterized by N2 adsorption isotherms at 77 K using different microwave input power.
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