Hydrodesulfurization performance of MoO3-LaHY catalyst prepared by solid-state reaction
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Abstract
MoOx-LaHY catalysts were prepared with the mixture of (NH4)6Mo7O24·4H2O and LaHY through solid-state reaction under air atmosphere and characterized by XRD and NH3-TPD techniques; their hydrodesulfurization (HDS) performance was evaluated by using the solution of dibenzothiophene (DBT, 0.6% by mass) in decane as a model reactant. The results indicated that by using solid-state reaction at 520℃, 4.36% of Mo species is incorporated into the molecular sieve LaHY, which forms the single-phase complex nMoOx·LaHY, while the rest Mo species is dispersed on the outer surface of LaHY. As a result of forming the single-phase complex, the lattice parameters of MoOx-LaHY catalysts are enlarged and their acidity is reduced. Over the sulfided MoOx-LaHY catalysts, the conversion of DBT reaches 86.74% for the HDS under the conditions of 310℃, 4.0MPa and a space velocity 20h-1. Raising the solid-state reaction temperature may increase the content of the single-phase complex incorporated in the resultant MoOx-LaHY catalysts, but it cannot significantly enhance their HDS activity.
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