CONICET | Buscador de Institutos y Recursos Humanos

Circular economy is a new global strategy to reduce waste and pollution by encouraging renewable resources and through a reasonable management of water and energy consumption. Within this context, agroindustrial sector requires separation processes to capture and recycle CO2. In this sense, renewable carbonaceous materials can be converted into innovative separation agents in adsorption cycles for CO2 capture. This work demonstrates that renewable and electroactive structured adsorbents derived from biomass residues can effectively work for CO2 capture through electric swing adsorption cycles. These renewable materials were prepared from sugarcane harvest residues following the methodology previously reported (Fig. 1) [1]. Different adsorption/desorption cycles were performed in an experimental setup which consists of two mass flow controllers (pure N2 and a 14% CO2/N2 gas mixture), a column with the tubular material and a CO2 analyzer to measure the gas composition at the column outlet. CO2 adsorption and direct heating desorption processes were performed to test the material cyclic performance.The tubes showed thermoelectrical properties when voltage (0.0 V 10.0 V) was applied between their ends, reaching temperatures near 473 K in just a few seconds. The temperature of the tubular material was controlled through the manipulation of the applied voltage. The tubes were also filled and combined with highly selective materials, e.g. 13X zeolite to form hybrid structured adsorbents. The cyclic tests showed a quick CO2 release for the Joule heating desorption test when compared to the step at room temperature (Fig. 2). Also, consecutive adsorption/direct heating desorption tests were performed which showed consistence and repeatability in the adsorbent performance.These renewable structured adsorbent materials are versatile and suitable for its use in adsorption cycles, reducing desorption time though the direct heating of the tube.

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