Preparation method for novel heavy oil hydrogenization demetallization catalyst adopting macroporous structures

Abstract

The invention discloses a preparation method for a novel heavy oil hydrogenization demetallization catalyst adopting macroporous structures. The preparation method is characterized by particularly comprising the following steps: 1) preparing alumina sol; 2) mixing pitch residue powder with the alumina sol to prepare a catalyst carrier adopting the macroporous structures; 3) impregnating the formed catalyst carrier by a two-step impregnation method adopting isopyknic division to finally obtain the catalyst. The catalyst prepared by the method adopts mesopore structures and the macroporous structures at different proportions; the proportion of the macroporous structures can be adjusted with the amount of pore forming materials of pitch residues. A diffusion experiment shows that the catalyst adopting the macroporous structures in a certain proportion meets mechanism of a heavy oil hydrogenization demetallization reaction, has a relatively high metal accommodation ability, effectively lowers the reaction resistance in the heavy oil hydrogenization demetallization reaction process, improves effective diffusion coefficient of heavy oil in the catalyst, and is suitable for processing heavy oil or residual oil with relatively high metal content.

Description

technical field [0001] The invention relates to a preparation method of a novel macroporous structure heavy oil hydrogenation demetallization catalyst. The preparation method is suitable for preparing various heavy oil hydrogenation treatment catalysts, especially suitable for preparing various heavy oil hydrogenation demetallization catalysts. Background technique [0002] With the obvious trend of heavy crude oil, the technology of lightening heavy oil has received extensive attention. Heavy oil hydrogenation is an important means of lightening heavy oil, so heavy oil hydrogenation catalyst is the key to the development of heavy oil hydrogenation technology. Heavy oil has larger molecules, higher non-hydrocarbon impurities, and does not gasify under catalytic hydrogenation conditions. The hydrogenation reaction of heavy oil is often an internal diffusion-controlled reaction. At the same time, heavy oil contains a large amount of metals, mainly nickel and vanadium, and...

AI Technical Summary

Problems solved by technology

Less suitable for heavy oils with higher metal content

[0007] The existing technologies including the above have the following common characteristics and problems: the preparation process is relatively complicated, and the performance of the prepared hydrogenation catalyst mainly includes pore size, pore volume, specific surface area and pore distribution, etc. The dependence of the catalyst is relatively large, and the mechanical strength of the prepared catalyst is poor. At the same time, changing the raw material and preparation conditions will have an impact on the pore volume, pore diameter, specific surface area, pore distribution and mechanical strength of the prepared catalyst. Therefore, if you want to It will be very difficult to adjust the pore structure of the catalyst by changing a certain parameter, and the repeatability of the preparation method is poor. The drying and roasting methods of the catalyst in these technologies are ordinary drying and roasting methods, which have a great influence on the mechanical strength of the catalyst. , thus affecting the long-term operation of the heavy oil hydrogenation catalyst

At the same time, these heavy oil hydrogenation catalysts have a certain degree of broadness and are suitable for hydrocracking and hydrofinishing, rather than catalysts tailored for heavy oil hydrodemetallation reactions, and are not suitable for heavy oil hydrodemetallation reactions