Chuayboon, Srirat

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Chuayboon, Srirat
Alternative Name
Chuayboon, S.
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Email
srirat.ch@kmitl.ac.th

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    Chemical Looping CH4 Reforming Through Isothermal Two-Step Redox Cycling of SrFeO3 Oxygen Carrier in a Tubular Solar Reactor
    (2025-03-01)
    Abanades, Stéphane
    ;
    Wang, Xinhe
    ;
    Chuayboon, Srirat
    The chemical looping reforming of methane using an SrFeO<inf>3</inf> oxygen carrier to produce synthesis gas from solar energy was experimentally investigated and validated. High-temperature solar heat was used to provide the reaction enthalpy, and therefore the methane feedstock was entirely dedicated to producing syngas. The two-step isothermal process encompassed partial perovskite reduction with methane (partial oxidation of CH<inf>4</inf>) and exothermic oxidation of SrFeO<inf>3-δ</inf> with CO<inf>2</inf> or H<inf>2</inf>O splitting under the same operating temperature. The oxygen carrier material was shaped in the form of a reticulated porous foam structure for enhancing heat and mass transfer, and it was cycled in a solar-heated tubular reactor under different operating parameters (temperature: 950–1050 °C, methane mole fraction: 5–30%, and type of oxidant gas: H<inf>2</inf>O vs. CO<inf>2</inf>). This study aimed to assess the fuel production capacity of the two-step process and to demonstrate the potential of using strontium ferrite perovskite during solar cycling for the first time. The maximum H<inf>2</inf> and CO production rates during CH<inf>4</inf>-induced reduction were 70 and 25 mL/min at 1000 °C and 15% CH<inf>4</inf> mole fraction. The increase in both the cycle temperature and the methane mole fraction promoted the reduction step, thereby enhancing syngas yields up to 569 mL/g during reduction at 1000 °C under 30% CH<inf>4</inf> (778 mL/g including both cycle steps), and thus outperforming the performance of the benchmark ceria material. In contrast, the oxidation step was not significantly affected by the experimental conditions and the material’s redox performance was weakly dependent on the nature of the oxidizing gas. The syngas yield remained above 200 mL/g during the oxidation step either with H<inf>2</inf>O or CO<inf>2</inf>. Twelve successive redox cycles with stable patterns in the syngas production yields validated material stability. Combining concentrated solar energy and chemical looping reforming was shown to be a promising and sustainable pathway toward carbon-neutral solar fuels.
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    Stepwise Solar Methane Reforming and Water-Splitting via Lattice Oxygen Transfer in Iron and Cerium Oxides
    (2020-08-01)
    Chuayboon, Srirat
    ;
    Abanades, Stéphane
    ;
    Rodat, Sylvain
    Chemical-looping reforming of methane (CLRM) involves lattice oxygen transfer in metal oxides. This study aims to compare iron (Fe<inf>2</inf>O<inf>3</inf>) and cerium (CeO<inf>2</inf>) oxides as oxygen carrier materials for isothermal solar-driven stepwise CH<inf>4</inf> reforming and H<inf>2</inf>O splitting. Experiments are conducted in a directly irradiated lab-scale solar reactor heated by concentrated sunlight at 950–1150 °C. Using solar energy for process heat reduces the dependence on fossil energy resources and avoids CO<inf>2</inf> emissions, while converting solar energy into chemical fuels. The performance of the oxygen carrier materials is compared and evaluated by determining the amount of oxygen transferred, methane conversion, syngas yield, and thermochemical cycling stability. As a result, iron oxide reduction with methane strongly depends on temperature and displays relatively lower reaction rate than CeO<inf>2</inf>. The reduced iron is not completely reoxidized to Fe<inf>3</inf>O<inf>4</inf> after water-splitting because of low thermal stability resulting in strong sintering and agglomeration, thereby decreasing syngas yield and leading to material deactivation. In contrast, ceria exhibits faster reaction rate and stable syngas yield with H<inf>2</inf>/CO molar ratios approaching two over repeated cycles. Stable patterns in the averaged oxygen nonstoichiometry (δ = 0.35–0.38) demonstrate excellent thermal cycling stability. Thus, using Fe<inf>2</inf>O<inf>3</inf> oxygen carrier is not suitable for solar CLRM, but iron oxide reduction with methane can be promising for solar metallurgy aiming at producing both metallic iron and syngas.