Quick-EXAFS and Raman monitoring of activation, reaction and deactivation of NiCu catalysts obtained from hydrotalcite-like precursors

Passos, Aline Ribeiro; Fontaine, Camille La; Pulcinelli, Sandra Helena; Santilli, Celso Valentim; Briois, Valérie

doi:10.1039/d0cp00380h

Cited by 10 publications

(12 citation statements)

References 53 publications

(75 reference statements)

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“…S4a). 30 Fourier-transformed extended X-ray absorption fine structure (FT-EXAFS) of the Ni K-edge showed that the peaks of Ni in Ni SA/CeO 2 were totally different from the curve of Ni in NiO (Fig. 1g) but similar to the curve of Ce in CeO 2 .…”

Section: Resultsmentioning

confidence: 98%

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Yuan

Peng

et al. 2022

Green Chem.

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Section: Resultsmentioning

confidence: 98%

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Yuan

Peng

et al. 2022

Green Chem.

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“…The D/G ratio of catalysts based on alumina as support, customarily related to high ordered coke formation, is estimated to � 2, while the average in the catalysts studied here was 0.4. [46] For the sample reduced at 700 °C, the combined bands R1 and R2 represent more than 80 % of the coke in Ni 10 MgO catalyst. It suggests that the catalyst had more significant deactivation even though the predominant amount of carbon is formed by monoatomic carbon.…”

Section: Analysis Of the Spent Catalystsmentioning

confidence: 98%

Appraisal of Ni Species Supported on Porous MgO during Ethanol Steam Reforming by XAS

et al. 2022

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Operando time-resolved X-ray absorption spectroscopy (XAS) was used to determine nickel species supported on porous MgO during the ethanol steam reforming reaction. The Principal Component Analysis (PCA) of the nickel K-edge XAS spectra revealed Ni(OH) 2 , NiMgO, and metallic Ni during the activation and reaction of the catalysts. The Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS) method for the timeresolved XAS spectra data permitted to calculate the concentration of species during the activation and reaction steps and to determine the formation of NiMgO and nickel reduction degree. The samples prepared with surfactants, Ni 10 MgO-F127 and Ni 10 MgO-P123, showed less nickel reduction (less than 30 %) but were more active and stable than the reference Ni 10 MgO catalyst, which reduced 52 %. It happened due to the smaller particle size and a larger specific area of the porous supports. The samples synthesized without Pluronic deactivated, and ethanol dehydrogenation became predominant instead of the ethanol steam reforming.

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“…Some studies have suggested the possibility of amorphous carbon deposits also being responsible for deactivation [66,67]. However, the lower total amount of coke produced in the presence of small particles is a general factor for the maintenance of catalytic activity [68].…”

Section: Stability and Analysis Of The Spent Catalystsmentioning

confidence: 99%

Sol-gel synthesis of nanocrystalline MgO and its application as support in Ni/MgO catalysts for ethanol steam reforming

Possato

Gonçalves

Santos

et al. 2021

Applied Surface Science

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Quick-EXAFS and Raman monitoring of activation, reaction and deactivation of NiCu catalysts obtained from hydrotalcite-like precursors

Abstract: MCR-ALS analysis of Quick-EXAFS combined to Raman provide insight into activation/reactivity and deactivation of NiCu-catalysts used for Ethanol Steam Reforming.

Cited by 10 publications

References 53 publications

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Coke and sintering resistant nickel atomically doped with ceria nanosheets for highly efficient solar driven hydrogen production from bioethanol

Appraisal of Ni Species Supported on Porous MgO during Ethanol Steam Reforming by XAS

Sol-gel synthesis of nanocrystalline MgO and its application as support in Ni/MgO catalysts for ethanol steam reforming

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