Hydrogenation catalyst and preparation method thereof

Abstract

The invention provides a hydrogenation catalyst and a preparation method thereof. The preparation method uses metal active components of group VIB and VIII for step load, wherein metal of group VIB is molybdenum, metal of group VIII is cobalt or nickel, and a carrier is porous oxide. Load of group VIB metal uses a corresponding soluble salt as a raw material, inorganic acid is used as an acidifying agent, and a long-chain alkyl quaternary ammonium cation is used as a precipitating agent; and Mo-based single-component loaded catalyst is prepared by firstly synthesizing an organic-inorganic hybrid material suspension, performing aqueous phase diffusion and tunnel deposition, filtering, washing, drying, and roasting. Load of group VIII metal uses a corresponding soluble salt as a raw material, and the metal is loaded onto the carried through a normal-temperature isopyknic dipping technology. The method can effectively improve load capacity of the active components and dispersiveness of the active components in the tunnels; and the prepared hydrotreating catalysts is excellent in hydrodesulfurization activity.

Description

technical field [0001] The invention belongs to the technical field of preparation of hydrorefining catalysts, and in particular relates to a method for preparing a hydrogenation catalyst with high loading of active components and high dispersion. Background technique [0002] Hydrofining technology is the most important means to produce low-sulfur gasoline and diesel, and hydrofining catalyst is the core technology of hydrofining technology. The main active component is VIB group metal W or Mo, the VIII group metal Ni or Co is the auxiliary active component, and γ-Al 2 o 3 The supported catalyst is a hydrorefining catalyst widely used commercially. In addition to focusing on exploring new active components and supports, the current research and development of hydrofining catalysts is also one of the effective ways to develop high-performance catalysts based on traditional active component systems and supports, improving the dispersion and loading of active components in c...

AI Technical Summary

Problems solved by technology

In addition, the strong interaction between the active component and the support leads to the formation of Al-O-Mo chemical bonds, that is, the so-called "support effect", which makes the catalyst active component form a spinel structure and lose its catalytic activity on the one hand, On the other hand, it causes difficulty in sulfidation of active components and reduces catalyst activity (see F.Y.A.El Kady et al., Fuel 2010, 89: 3193; J.A. Bergwerff et al., Journal of the American Chemical Society 2004, 126: 14548; J.A. Bergwerff et al. al., Catalysis Today 2008, 130: 117; K. Bourikas et al., Journal of Colloid and Interface Science 1996, 184: 301; G. Mestl et al., Catalysis Reviews: Science and Engineering 1998, 40: 451.)

In addition, during the drying and roasting process after impregnating the active component, the active component precursor solution in the carrier channel will be divided into many discontinuous small segments, and the active material dissolved in it will form larger active material particles. The blockage of some pores of the carrier is not conducive to the diffusion of reactant molecules and product molecules; at the same time, the capillary force promotes the migration of the solution to the outer surface of the carrier, reducing the dispersion of active components and reducing the utilization of active metals.

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