Thermal stability study of NiAl2O4 binders for Chemical Looping Combustion application

Autor: Ludovic Josien, Arnold Lambert, Sophie Dorge, Lucia Blas, Damaris Kehrli, Patrick Dutournié
Přispěvatelé: French-German Research Institute of Saint Louis, Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Laboratoire de Gestion des Risques et Environnement (GRE), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA)), IFP Energies nouvelles (IFPEN)
Rok vydání: 2016
Předmět:
Zdroj: Fuel
Fuel, Elsevier, 2016, 182, pp.50-56. ⟨10.1016/j.fuel.2016.05.080⟩
ISSN: 0016-2361
1873-7153
DOI: 10.1016/j.fuel.2016.05.080
Popis: International audience; The influence of the preparation method of NiAl2O4 binders on their thermal stability was studied. For thispurpose, the reactivity of two different NiAl2O4 binders with CO as fuel was studied in a fixed bed reactordevice. Successive oxidation–reduction cycles were performed on the two binders to study their reactivitywith the fuel and their structural modifications as cycles proceed. Results reveal that binders are not inert inreducing atmosphere; they both react with the fuel to produce CO2. The total reduction capacity (TRC) of thefirst binder (B1, synthetized by pyrolytic pulverization) increases during the first cycles and levels off after20 cycles. However, the TRC of the second binder (B2, synthetized by calcination of a mixture of Ni(OH) andc-Al2O3), increases progressively and reaches a maximum after 80 cycles. The growing amount of availableoxygen in the binders leads both binders to structural modifications. X-ray Diffraction studies performed onfresh and aged binders presented a shift of the peaks related to NiAl2O4. Moreover, quantitative X-rayDiffraction studies and Temperature Programmed Reduction measurements were performed in order toquantify the NiO present in each binder before and after oxidation–reduction cycles. These experimentsrevealed the presence of NiO in fresh binders due to the preparation method, and an increase of this amountafter oxidation–reduction cycles. Therefore, NiAl2O4 in the binder is progressively decomposed producingNiO and Al2O3. Finally, the decomposition of the binder NiAl2O4 as cycles proceed was also observed in studiesperformed on the oxygen carrier NiO/NiAl2O4. This work showed that the binder reacts with the fuel andtherefore it can contribute to the modification of the oxygen carrier reactivity.
Databáze: OpenAIRE
Externí odkaz: