High-activity hydrodemetallization catalyst and preparation method thereof

Abstract

The invention discloses a high-activity hydrodemetallization catalyst and a preparation method of the high-activity hydrodemetallization catalyst. The catalyst uses alumina to serve as a carrier and uses MoO3 and NiO to serve as active components. The catalyst comprises active components by weight: 1.0-15.0% of the MoO3 and 0.5-6.0% of NiO, a pore volume of the catalyst is 0.80-1.40ml / g, a specific surface area is 180.0-250.0m<2> / g, a pore diameter is 10-20 nanometers and is 80%-90% of a total pore volume, and a crushing strength is 120-150N / cm. The preparation method of the high-activity hydrodemetallization catalyst comprises the steps of conducting molding, drying and roasting processes of an alumina supporter; adopting an immersing method to load metal components of Mo and Ni, conducting drying and roasting processes, roasting a molded supporter under a nitrogen atmosphere in the roasting process of the alumina supporter, and then roasting under an air atmosphere. The high-activity hydrodemetallization catalyst prepared by using the preparation method has high-activity stability, has a big pore volume and a pore diameter, has concentrated pore distribution and has moderate mechanical strength.

Description

technical field [0001] The invention relates to a highly active hydrogenation demetallization catalyst and a preparation method thereof. Background technique [0002] At present, in the production process of hydrodemetallization of heavy oil and residual oil, because the raw oil contains a certain amount of impurities such as vanadium, sulfur, arsenic, nickel, etc., deposits are easily formed, thereby blocking the pores of the catalyst, resulting in a rapid decline in catalyst activity. , resulting in inactivation and affecting industrial applications. The physical properties of the catalyst support, such as the programmable pore size, pore size distribution, mechanical strength, specific surface area, pore volume, etc., are important factors affecting the activity and stability of the hydrodemetallization catalyst. Alumina is a commonly used catalyst carrier, widely used in petroleum processing, chemical industry, environmental protection and other fields. The alumina and...

AI Technical Summary

Problems solved by technology

The existing technology has such shortcomings: during the high-temperature calcination process of the carrier, the physical pore-enlarging agent first oxidizes and transforms into a gas at a relatively low temperature (about 600°C) and releases the space originally occupied, forming macropores

Therefore, it is easy to cause the space released when the physical pore-enlarging agent in the carrier is oxidized, that is, the formed macropores collapse and sinter, which reduces the pore volume and specific surface area of ​​the carrier, widens the pore distribution, and deteriorates the mechanical strength.

However, the hydrodemetallization catalyst prepared with this macroporous alumina as a carrier also has the disadvantages of pore volume, low specific surface area, wide pore distribution, and poor mechanical strength.