Hydration effects of Al2(MoO4)3 and AlPO4 phases in hydrotreating catalysts studied by solid state nuclear magnetic resonance spectroscopy |
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| Authors: | Oc Hee Han Chih Yung Lin Gary L Haller |
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| Affiliation: | (1) Department of Chemical Engineering, Yale University, 06511 New Haven, CT, USA;(2) Department of Chemistry, Yale University, 06511 New Haven, CT, USA;(3) Present address: Technical Department, Formosa Plastics Company, 201 Formosa Drive, 77978 Pt. Comfort, TX, USA |
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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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| Keywords: | NMR studies of AlPO4 NMR studies of Al2(MoO4)3 |
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