High-strength alumina-based hydrogenation catalyst as well as preparation method and application thereof

Abstract

The invention provides a high-strength alumina-based hydrogenation catalyst, which comprises a carrier and an active component, the carrier comprises alumina, a modifier A selected from at least one of zirconia, titanium oxide and silicon oxide, and a modifier B selected from at least one of magnesium oxide, potassium oxide and calcium oxide; the active component is a VIB group metal sulfide and a VIII group metal oxide. The catalyst is prepared by adopting a coprecipitation method and comprises the following steps: firstly, preparing a mixture of aluminum oxide and a modifier A, adding group VIB metal salt and precursor salt of a modifier B in an aging process after precipitation is completed, vulcanizing, forming, dipping group VIII metal salt, and drying to obtain the catalyst. The catalyst has high mechanical strength and hydrogenation activity, the application range of the catalyst is widened, and the catalyst is especially suitable for the hydrogenation process of water-containing raw materials such as coal tar and biodiesel.

Description

technical field [0001] The invention relates to the technical field of hydrogenation of oil products, in particular to a high-strength alumina-based hydrogenation catalyst. Background technique [0002] As the maintenance period of the main hydrogenation unit in the refinery increases from 2-3 years to 4-5 years, the high mechanical strength of the hydrogenation catalyst is also an important factor to ensure the long-term operation of the unit. Since the alumina carrier is in a water vapor environment, the surface of the alumina will react with water, resulting in a reduction in the mechanical strength of the conventional alumina-based hydrogenation catalyst, resulting in an increase in the pressure drop of the device, resulting in a reduction in the operating cycle of the device. [0003] Hydrotreating of coal tar is an important process for refining coal tar, mainly to remove impurities such as sulfur and nitrogen in coal tar. CN 108906118A discloses a coal tar hydrogenat...

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Problems solved by technology

[0005] In order to solve the problems of low mechanical strength and poor hydrothermal stability of alumina-based hydrogenation catalysts in the prior art, the present invention provides a high-strength alumina-based hydrogenation catalyst with high mechanical strength and hydrothermal stability. Stability, which broadens the scope of application of the catalyst, especially, it is especially suitable for the hydrogenation process of coal tar, biodiesel and other water-containing raw materials

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