Method for preparing petroleum distillate oil hydrotreating catalysts without torrefaction

Abstract

The invention provides a preparation method for roasting-free hydrotreating catalyst, the catalyst takes Al 2 O 3, SiO 2, TiO 2, and a composite oxide of two of the Al 2 O 3, the SiO 2 as carriers, and takes group 6B metals and group 8 metals as active metal components, a right amount of organic chelating agent is added into metal impregnation liquid, to adjust the pH value of the impregnation liquid, the active metal components are supported to the upper part of the carrier by adopting a co-impregnation method or a multi-step impregnation method, the carriers supporting the metal components are dried for 4 to 10 hours at 120 DEG C, without roasting, thereby the highly active hydrofining catalyst can be directly obtained. The metal components of the catalyst prepared by the invention have better dispersibility and sulfidization, thus the catalyst has good activity of hydrogen desulfurization and hydrodenitrification to petroleum fraction.

Description

technical field [0001] The invention provides a method for preparing a roasting-free petroleum fraction hydrotreating catalyst. Specifically, the present invention proposes a new catalyst preparation method for loading active metal components on a carrier, that is, adding an organic chelating agent to the active metal impregnating solution, through the interaction between the chelating agent and the metal component, improving the metal The dispersibility and vulcanization of the active components improve the performance of the catalyst; the catalyst prepared by this method has a large specific surface area, pore volume and suitable acid distribution, which can increase the number of metal catalytic active centers in the hydrogenation reaction of petroleum fractions , It has good hydrodesulfurization and hydrodenitrogenation properties for petroleum fractions. Background technique [0002] With the intensification of heavy and inferior crude oil worldwide, the proportion of ...

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Problems solved by technology

[0007] CN1853779A proposes a fluorine-containing hydrogenation catalyst with silica-alumina as a carrier and its preparation method. The method is to pre-impregnate fluorine on the surface of the carrier, and then load and impregnate an active metal salt solution; or mix fluorine and metal salt After the solution is mixed and then co-impregnated, the activity of the catalyst prepared by the modification method of introducing fluorine is improved to a certain extent, but due to the introduction of fluorine, it is easy to cause the pore blockage of the carrier and the decrease of the specific surface area, so the improvement of the catalyst performance is limited.

However, these preparation methods still have problems such as little improvement in catalyst performance.