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Hydration effects of Al2(MoO4)3 and AlPO4 phases in hydrotreating catalysts studied by solid state nuclear magnetic resonance spectroscopy

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Abstract

Solid state nuclear magnetic resonance spectroscopy of27Al,31P, and95Mo nuclei was used to investigate species on a NiPMo/Al2O3 hydrotreating catalyst calcined at 750 °C before and after rehydration. The Al2(MoO4)3 phase disappeared after rehydration in 100% relative humidity at room temperature. However, almost none of the observed crystalline AlPO4 reacted with adsorbed water. The results show that the Al2(MoO4)3 phase on an alumina surface reacts easily with moisture unlike Al2(MoO4)3 in the bulk phase. It also suggests that the crystalline AlPO4 phase is formed under the Al2(MoO4)3 phase or that both species are formed as neighboring islands on the surface of the alumina but have different reactivities toward moisture.

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Author notes

  1. Chih Yung Lin

    Present address: Technical Department, Formosa Plastics Company, 201 Formosa Drive, 77978, Pt. Comfort, TX, USA

Authors and Affiliations

  1. Department of Chemical Engineering, Yale University, 06511, New Haven, CT, USA

    Oc Hee Han, Chih Yung Lin & Gary L. Haller

  2. Department of Chemistry, Yale University, 06511, New Haven, CT, USA

    Oc Hee Han & Gary L. Haller

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  1. Oc Hee Han
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  2. Chih Yung Lin
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  3. Gary L. Haller
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Han, O.H., Lin, C.Y. & Haller, G.L. Hydration effects of Al2(MoO4)3 and AlPO4 phases in hydrotreating catalysts studied by solid state nuclear magnetic resonance spectroscopy. Catal Lett 14, 1–9 (1992). https://doi.org/10.1007/BF00764212

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  • DOI: https://doi.org/10.1007/BF00764212

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