FAU-Type Zeolite Nanocasted Carbon Replicas for CO2 Adsorption and Hydrogen Purification
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Abstract
Microporous ordered carbon have been synthesized by the nanocasting process from zeolite Y using acetylene and furfuryl alcohol as carbon precursors. If the proper synthesis conditions are chosen, these materials retain the long-range order of the zeolite mold. The resulting carbons possess a large surface area (≥2200 m2/g), a high microporosity (≥1.0 cm3/g), and a controlled pore size distribution, which was tailored by the wall thickness of the zeolite template. Because of their high micropore volume, the carbon replicas of zeolite Y are attractive adsorbent materials and might be used to replace conventional activated carbons as adsorbents in pressure swing adsorption processes (PSAs) for H2 purification. In the present contribution, we evaluate the adsorption capacity of the carbon replicas in a H2-PSA based on their single-component adsorption isotherms of CO2, CH4, and N2 measured at room temperature. The ideal adsorbed solution theory (IAST) was used to predict the co-adsorption of CO2/CH4/N2 gas mixtures and to evaluate the working capacity of the materials under typical operating conditions of a H2-PSA process. The comparison of the working capacities shows that the carbon replicas largely outperform conventional activated carbons while having comparable CO2/CH4 and CO2/N2 selectivity.
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