Preparation method of hydrofining catalyst with high mechanical strength

Abstract

The invention discloses a preparation method of a hydrofining catalyst with high mechanical strength. The preparation method comprises the following steps: taking pseudo-boehmite and sesbania cannabina powder as raw materials; adding a nitric acid solution; then extrusion-molding, drying and carrying out three-section type roasting to obtain an aluminum oxide carrier; dissolving phosphoric acid and an organic additive into de-ionized water to prepare a solution; then adding the solution into a metal salt mixture; stirring, heating and refluxing to obtain an active component immersion solution;adding the obtained immersion solution into the aluminum oxide carrier; carrying out equal-volume immersion; then raising the temperature and drying to obtain the hydrofining catalyst. According to the preparation method disclosed by the invention, the catalyst with the high mechanical strength is prepared by adopting an immersion method and the organic additive is added in a preparation process;formation and distribution of a surface active center of the carrier can be optimized; the catalyst with the high mechanical strength can be obtained; meanwhile, relatively high catalytic activity ofthe catalyst can be ensured; the problem of a preparation technology in the prior art that a pore structure of the carrier is damaged or the catalyst is increased to improve the mechanical strength is overcome.

Description

technical field [0001] The invention belongs to the technical field of hydrogenation catalyst preparation, and in particular relates to a preparation method of a hydrogenation refining catalyst with high mechanical strength. Background technique [0002] Fuel oil generally comes from petroleum smelting, which inevitably contains a certain amount of sulfur, nitrogen and other compounds, which will release sulfur and nitrogen oxides during the combustion process, causing serious pollution to the environment. With the continuous enhancement of people's awareness of environmental protection and the continuous improvement of environmental protection requirements in countries all over the world, low-sulfurization and no-sulfurization of oil products is an inevitable trend in future development. more serious challenges. As of 2009, the environmental regulations of developed countries such as Europe and the United States have fully required that the sulfur content in diesel oil be ...

AI Technical Summary

Problems solved by technology

Among them, the method of improving the mechanical strength of the carrier is mainly to increase the mechanical strength of the carrier by adding different binders or improving the molding conditions, but these methods will affect other physical and chemical properties of the carrier, such as bulk density, pore structure, etc.

For example, in CN101450327B, in order to reduce the influence of the binder on the physical and chemical properties of the carrier itself, although a pore-forming agent was additionally introduced, after tablet molding, the average pore diameter of the carrier was only 6.3 nm, the pore volume was 0.43 mL / g, and the impregnation activity After components, the pore volume and pore size become smaller, which is not suitable for impregnating high-concentration active components, and is also not conducive to the diffusion and mass transfer of large-sized molecular reactants, thereby affecting the catalytic performance of the catalyst; the method of post-treatment of the catalyst will increase The preparation process of the catalyst makes the preparation procedure complicated and cumbersome, reduces the production efficiency, and increases the production cost of the catalyst at the same time

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