Crude benzene hydrorefining catalyst and preparation method thereof

Abstract

The invention discloses a crude benzene hydrorefining catalyst and a preparation method thereof. The catalyst consists of a pre-hydrogenization catalyst and a main hydrogenization catalyst, wherein the pre-hydrogenization catalyst is obtained by performing surface modification on active aluminum oxide serving as a carrier by adding rare elements, then soaking the active aluminum oxide in a molybdenum and nickel solution and performing activation; the main hydrogenization catalyst is obtained by performing surface modification on active aluminum oxide and titanium dioxide which serve as carriers by adding rare elements, then soaking the carriers in a molybdenum and cobalt solution and performing activation. By the adding of phosphoric acid and rare earth metal, the catalyst disclosed by the invention is beneficial for dispersion of molybdenum serving as an active component, and the specific surface area is relatively large and uniform; the number of active points is increased; moreover, by the adding of the rare elements, the poisoning performance and the carbon deposition resistance of the catalyst are enhanced; by virtue of the preparation of the catalyst carriers and the adding of the titanium dioxide and the rare earth material, the use temperature range of the catalyst is enlarged, and the defect that the use temperature range of an existing catalyst is relatively small is effectively overcome.

Description

technical field [0001] The invention relates to the technical field of chemical catalysts, in particular to a crude benzene hydrotreating catalyst and a preparation method thereof. Background technique [0002] At present, the hydrorefining catalysts used in the market are basically imported, which are expensive and not suitable for large-scale purchase and use. [0003] However, domestic crude benzene raw materials are relatively complex, and the sources include coking benzene, petroleum benzene, etc., and their sulfur and nitrogen contents are high. The catalysts on the market cannot adapt to the environment of high sulfur and high nitrogen, which often leads to refined products. Unqualified; moreover, this type of catalyst is very sensitive to temperature, the operating temperature is narrow, and the change of temperature often leads to a significant decline in the recovery rate of benzene. Contents of the invention [0004] Aiming at the above-mentioned shortcomings o...

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Problems solved by technology

[0002] At present, the hydrorefining catalysts used in the market are basically imported, which are expensive and not suitable for large-scale purchase and use.

[0003] However, domestic crude benzene raw materials are relatively complex, and the sources include coking benzene, petroleum benzene, etc., and their sulfur and nitrogen contents are high. The catalysts on the market cannot adapt to the environment of high sulfur and high nitrogen, which often leads to refined products. Unqualified; moreover, this type of catalyst is very sensitive to temperature, the operating temperature is narrow, and the change of temperature often leads to a significant decrease in the recovery rate of benzene

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