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>Preparation and CO2 Adsorption Properties of Soft- Templated Mesoporous Carbons Derived from Chestnut Tannin Precursors
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Preparation and CO2 Adsorption Properties of Soft- Templated Mesoporous Carbons Derived from Chestnut Tannin Precursors
The high surface area and surface properties of ordered mesoporous carbon materials have proven valuable in separations, catalysis, energy conversion and energy storage technologies. In particular, their function as CO2 adsorption material has gained increased attention because of the difficulties with solvent recovery in solvent absorption methods, pushing interest towards solid adsorbents. Mesoporous solids offer bimodal micro-mesoporous structure, where CO2 adsorption over a solid sorbent calls for microporous (>2 nm pores) surface area for adsorption and mesoporous (2-50 nm pores) channels to aid in mass transport for high adsorption capacities without a large pressure differential. The inert carbon surface provides selective CO2 desorption with by pressure swing desorption. For a heterogeneous carbon source to obtain an ordered adsorption surface, a templating agent must be used. Although hard templating yields highly ordered, high surface area microporous materials, synthesis of templating agents is costly and requires harsh acids (i.e. HF) to remove the inorganic template. Self-assembly of triblock copolymers as templates require aqueous media and high temperature pyrolysis, which are also needed for synthesizing precursor carbon resin, thus this method is preferred.
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