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Genesis of active phase in MoW/Al2O3 hydrotreating catalysts monitored by HAADF and in situ QEXAFS combined to MCR-ALS analysis

Abstract : Alumina supported MoW hydrotreating catalyst was synthesized by using bimetallic H-4[SiMo3W9O40] Keggin heteropolyacid (HPA). Catalysts based on monometallic H-4[SiMo3W9O40] and H-4[SiMo3W9O40] and their mixture were also studied. Genesis of the active phase was studied during atmospheric gas sulfidation by H2S/H-2 of the catalysts by in-situ Quick X-ray absorption spectroscopy (XAS) and High-Angle Annular Dark-Field (HAADF) imaging. The combination of different chemometric tools such as Principal Component Analysis (PCA) and Multivariate Curve Resolution with Alternating Least Squares (MCR-ALS) allowed to determine the number of intermediate species, their chemical nature and concentration profiles during sulfidation. It was found that tungsten sulfidation using bimetallic HPA precursor started at lower temperature, compared to W sulfidation in the monometallic and in the mixture of monometallic HPA catalysts. Simultaneous sulfidation of Mo and W atoms in case of the bimetallic molecular precursor can govern the formation of mixed MoWS2 phase, which formation during activation was evidenced by HAADF.
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https://hal.inrae.fr/hal-02987696
Contributor : Christopher Lallemant <>
Submitted on : Wednesday, November 4, 2020 - 10:02:54 AM
Last modification on : Wednesday, February 17, 2021 - 9:56:07 AM

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M. Nikulshina, P. Blanchard, C. Lancelot, A. Griboval-Constant, M. Marinova, et al.. Genesis of active phase in MoW/Al2O3 hydrotreating catalysts monitored by HAADF and in situ QEXAFS combined to MCR-ALS analysis. Applied Catalysis B: Environmental, Elsevier, 2020, 269, pp.118766. ⟨10.1016/j.apcatb.2020.118766⟩. ⟨hal-02987696⟩

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