Preparation method of hydrodesulfurization and dearomatization catalyst

Abstract

The invention discloses a preparation method of a hydrodesulfurization and dearomatization catalyst, which comprises the following steps: (1) loading group VIII metal onto a molecular sieve to obtain a material A; (2) uniformly mixing the material A, pseudo-boehmite precursor slurry and organic alcohol, then adding a silane coupling agent I, uniformly mixing the components, and adjusting the pH value to be alkaline to obtain slurry; (3) aging the slurry obtained in the step (2), after the aging is finished, filtering the material to remove certain moisture, adding organic amine and a silane coupling agent II, kneading into a plastic body, forming, drying and roasting the plastic body, and reducing group VIII metal in a hydrogen atmosphere to obtain a composite carrier; (4) loading group VIII metal and group VIB metal onto the composite carrier to prepare the catalyst. The catalyst prepared by the method gives full play to the acidity and hydrogen overflow effect of the molecular sieve, has very high hydrogenation performance, and is easy to desulfurize after hydrogenation of which sulfides are difficult to directly remove and carry out hydrogenation saturation of aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a preparation method of a hydrodesulfurization and dearomatization catalyst. Background technique [0002] In today's petroleum refining process, catalysts play a very important role, and the physical and chemical properties of catalyst supports have a great influence on the activity of catalysts. Usually the carrier of the hydrogenation catalyst is porous acidic alumina, and there are also literature patent reports to adopt porous low-acidity molecular sieve or composite alumina (CN103349995A, CN102631934A, CN105251527A, J.Catal.317(2014) 303-317, J.Catal.317( 2010) 273-286) as a carrier to prepare a highly active hydrogenation catalyst. Compared with porous acidic alumina carrier catalyst, this catalyst has stronger hydrogen adsorption capacity, so its hydrogenation activity is higher and it is easy to 4,6-dimethyl Hydrodesulfurization of dibenzothiophene (4, 6-DMDBT) which is difficult to directly remove sulfide. At the sa...

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Problems solved by technology

This method also does not avoid the addition of acid during the molding process, which will still lead to partial destruction of the carrier pore structure

At the same time, this method uses organic substances containing hydroxyl or carboxyl groups to enhance the binding ability of alumina and molecular sieves. There is no chemical reaction between alumina and molecular sieves, so it is difficult to effectively combine them. During the drying and roasting process, with the decomposition of organic substances, the product catalyst The alumina and molecular sieve components will agglomerate

[0004] At the same time, for the composite molecular sieve-alumina carrier, due to the difference in the adsorption properties of different material components, the catalyst synthesized by the conventional impregnation method cannot reflect the excellent performance of the composite carrier.

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