Development of CuO-based oxygen carriers supported on diatomite and kaolin for chemical looping combustion
DOI:
https://doi.org/10.33448/rsd-v10i4.12831Keywords:
CO2 capture; Chemical Looping Combustion; Oxygen Carriers; Copper; Diatomite; Kaolin.Abstract
Chemical Looping Combustion (CLC) technology has emerged as a promising alternative capable of restricting the effects of global warming due to anthropogenic gas emissions, especially CO2, through its inherent capture. This study aims to synthesize and evaluate Cu-based oxygen carriers supported on natural materials such as diatomite and kaolin, through the incipient wet impregnation method for CLC process applications. Oxygen carriers were characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), and scanning electron microscopy with surface energy dispersive x-ray spectroscopy (SEM-EDS). The mechanical strength of the two oxygen carrier particles was determined after the sintering procedure resulting in high crushing force. Reactivity of oxygen carriers was evaluated in a thermobalance with CH4 and H2 gases. Different reaction pathways were attempted when undergoing the redox cycles: total direct reduction of CuO to Cu0 for Cu-K and partial reduction of CuO to Cu2O and CuO to Cu-D. However, the highest reactivity and reaction rate was achieved in Cu-D due to the pore structure of diatomite, the chemical composition and the resulting interaction between CuO and the support. H2 gas reactivity tests showed a higher conversion rate and greater stability between cycles for both oxygen carriers. Thus, the reducible CuO content present in Cu-Diatomite during the reactivity test with H2 as the fuel gas was ideal for achieving high solids conversion, tendency for greater stability and a higher reaction rate.
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Copyright (c) 2021 Romário Cezar Pereira da Costa; Rebecca Araújo Barros do Nascimento ; Dulce Maria de Araújo Melo; Dener Silva Albuquerque; Rodolfo Luiz Bezerra de Araújo Medeiros; Marcus Antônio de Freitas Melo; Juan Adánez
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