Chemical looping combustion using geopolymer-based oxygen carriers

Bendoni, Riccardo; Miccio, Francesco; Medri, Valentina; Landi, Elena

doi:10.1016/j.cej.2018.02.018

Cited by 13 publications

(7 citation statements)

References 40 publications

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“…Recently, Miccio et al [7,8] have dispersed iron and iron/manganese oxides into a geopolymer matrix to provide low density materials with good resistance to mechanical stresses that can be suitable for fluidized bed reactors.…”

Section: Introductionmentioning

confidence: 99%

Performance and Stability of Metal (Co, Mn, Cu)-Promoted La2O2SO4 Oxygen Carrier for Chemical Looping Combustion of Methane

2019

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Oxygen carrier materials based on La2O2SO4 and promoted by small amounts (1% wt.) of transition metals, namely Co, Mn and Cu, have been synthesized and characterized by means of X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), Temperature-programmed reduction/oxidation (TPR/TPO) and thermogravimetry-mass-Fourier transform infrared spectrometry (TG-MS-FTIR) experiments under alternating feeds in order to investigate their potential use for the Chemical Looping Combustion process using either hydrogen or methane as the fuel. The chemical looping reactivity is based on the reversible redox cycle of sulfur from S6+ in La2O2SO4 to S2− in La2O2S and entails a large oxygen storage capacity, but it generally requires high temperatures to proceed, challenging material stability and durability. Herein we demonstrate a remarkable improvement of lattice oxygen availability and activity during the reduction step obtained by cost-effective metal doping in the order Co > Mn > Cu. Notably, the addition of Co or Mn has shown a significant beneficial effect to prevent the decomposition of the oxysulfate releasing SO2, which is identified as the main cause of progressive deactivation for the unpromoted La2O2SO4.

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Section: Introductionmentioning

confidence: 99%

Performance and Stability of Metal (Co, Mn, Cu)-Promoted La2O2SO4 Oxygen Carrier for Chemical Looping Combustion of Methane

2019

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“…Recently, very promising novel synthetic oxygen carriers based on geopolymer composites were proposed [25]. The main advantages of geopolymer OCs are, among others, low cost, green synthesis, non-toxicity, and CLOU feature [26]. Furthermore, a good mechanical resistance makes them suitable for fluidized bed applications [27].…”

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confidence: 99%

Chemical Looping Combustion: A Brief Overview

et al. 2022

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The current development of chemical looping combustion (CLC) technology is presented in this paper. This technique of energy conversion enables burning of hydrocarbon fuels with dramatically reduced CO2 emission into the atmosphere, since the inherent separation of carbon dioxide takes place directly in a combustion unit. In the beginning, the general idea of the CLC process is described, which takes advantage of solids (so-called oxygen carriers) being able to transport oxygen between combustion air and burning fuel. The main groups of oxygen carriers (OC) are characterized and compared, which are Fe-, Mn-, Cu-, Ni-, and Co-based materials. Moreover, different constructions of reactors tailored to perform the CLC process are described, including fluidized-bed reactors, swing reactors, and rotary reactors. The whole systems are based on the chemical looping concept, such as syngas CLC (SG-CLC), in situ Gasification CLC (iG-CLC), chemical looping with oxygen uncoupling (CLOU), and chemical looping reforming (CLR), are discussed as well. Finally, a comparison with other pro-CCS (carbon capture and storage) technologies is provided.

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“…Ice-template composite monoliths of 15 mm diameter and 16 mm height were obtained after the freeze-casting process. After the conditioning treatment at 900 °C, an anisotropic contraction (2-4% diameter; 3-5% height) occurred because of partial densification, due to sintering for viscous flow [4]. In Figure 2 the picture of the produced monoliths is reported.…”

Section: Macro-and Microstructural Characterization: Monolithsmentioning

confidence: 99%

“…Finally, the monoliths and the beads underwent a thermal treatment in a muffle furnace at 900 • C for 2 h in air, as a conditioning step in accordance to CLC process [4,5].…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…The production of composites is indeed of considerable importance to further increase the potentialities of geopolymers. In this respect, geopolymer composites have been already formulated to obtain oxygen carriers suitable for chemical looping combustion (CLC) processes [4,5] or catalysts for tar decomposition [6]. CLC is currently considered one of the best alternatives to reduce the economic cost of CO 2 capture.…”

Section: Introductionmentioning

confidence: 99%

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Ice-Templated Geopolymer—Fe/Mn Oxide Composites Conceived as Oxygen Carriers

et al. 2019

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Ice-templating (freeze-casting) technique was applied to a novel class of geopolymer composites containing Fe/Mn oxides, previously tested and reported in others works as synthetic oxygen carriers for chemical looping combustion (CLC), in order to obtain composite monoliths with lamellar macro-porosities by unidirectional freezing of water-based sol-gel systems. Geopolymer-Fe/Mn oxides composites carriers were also produced as beads, suitable for fixed bed reactors, by an injection-solidification method in liquid nitrogen. After conditioning at 900 °C, the temperature needed for CLC applications, the composite beads and monoliths possess similar total porosity % and total pore volume, being ≈65% and 570 mm3 g−1, respectively, as well as a specific surface area of around 2.4–2.9 m2/g.

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Chemical looping combustion using geopolymer-based oxygen carriers

Cited by 13 publications

References 40 publications

Performance and Stability of Metal (Co, Mn, Cu)-Promoted La2O2SO4 Oxygen Carrier for Chemical Looping Combustion of Methane

Performance and Stability of Metal (Co, Mn, Cu)-Promoted La2O2SO4 Oxygen Carrier for Chemical Looping Combustion of Methane

Chemical Looping Combustion: A Brief Overview

Ice-Templated Geopolymer—Fe/Mn Oxide Composites Conceived as Oxygen Carriers

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