Crude benzene hydrotreating catalyst and preparation method thereof

Abstract

The invention discloses a crude benzene hydrogenation refining catalyst and a preparation method thereof. The catalyst is composed of a pre-hydrogenation catalyst and a main hydrogenation catalyst, wherein the pre-hydrogenation catalyst uses activated alumina as a carrier, and rare earth elements are added to its surface Modified, then impregnated with molybdenum and nickel solution, and activated; the main hydrogenation catalyst uses activated alumina and titanium dioxide as the carrier, adding rare earth elements to modify its surface, and then impregnated with molybdenum and cobalt solution, activated. The invention adds phosphoric acid and rare earth metals to the catalyst, which is beneficial to the dispersion of molybdenum as an active component, so that the specific surface area is larger and more uniform, and the active points are increased. And the addition of rare earth elements enhances the anti-poisoning performance and anti-carbon deposition performance of the catalyst. The addition of titanium dioxide and rare earth materials in the preparation of the catalyst carrier increases the service temperature range of the catalyst, effectively improving the shortcoming of the existing catalyst with a relatively small service temperature range.

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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