Mn/MgAl2O4 oxygen carriers for chemical looping combustion using coal: influence of the thermal treatment on the structure and reactivity

Nascimento, Rebecca Araújo Barros do; Medeiros, Rodolfo L.B.A.; Costa, Tiago R.; Oliveira, Ângelo A.S.; Macedo, Heloísa P.; Melo, M. A. F.

doi:10.1007/s10973-019-09014-w

Cited by 8 publications

(1 citation statement)

References 44 publications

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“…Adánez et al, 2018a). In our previous works we evaluated other systems such as La2NiO4, NiO-Fe2O3/MgAl2O4, Mg6MnO8 and Mn2O3-MgAl2O4, in which we observed new structural characteristics that helped to develop and study new materials and processing forms (Costa et al, 2021;Medeiros et al, 2017Medeiros et al, , 2020Melo et al, 2018;Nascimento et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Evaluating the reactivity of CuO-TiO2 oxygen carrier for energy production technology with CO2 capture

Albuquerque¹,

Melo²,

Medeiros³

et al. 2021

RSD

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Chemical looping combustion (CLC) processes have been shown to be promising and effective in reducing CO2 production from the combustion of various fuels associated with the growing global demand for energy, as it promotes indirect fuel combustion through solid oxygen carriers (SOC). Thus, this study aims to synthesize, characterize and evaluate mixed copper and titanium oxide as a solid oxygen carrier for use in combustion processes with chemical looping. The SOC was synthesized based on stoichiometric calculations by the polymeric precursor method and characterized by: X-ray fluorescence (XRF), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM-FEG) with EDS, and Programmed Temperature Reduction (PTR). The oxygen carrying capacity (ROC) and the speed index of the reduction and oxidation cycles were evaluated by Thermogravimetric Reactivity (TGA). The main reactive phase identified was: The CuO phase for the mixed copper and titanium oxide were identified and confirmed by X-ray diffraction using the Rietveld refinement method. The reactivity of the CuO-TiO2 system was high, obtaining a CH4 conversion rate above 90% and a speed index of 40%/min. Due to the structural characteristics and the reactivity tests of this material, it is concluded that mixed copper and titanium oxide have the necessary requirements to be used in chemical looping combustion (CLC) processes.

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