Selective hydrogenation catalyst and preparation method thereof

Abstract

The invention provides a selective hydrogenation catalyst. Nickel serves as an active component; silicon-containing alumina serves as a carrier; based on 100% of the total weight of the catalyst, the selective hydrogenation catalyst comprises 10-20wt% of nickel oxide, 0-10wt% of cerium oxide and / or cerium oxide, 0-8wt% of alkali metal and / or alkaline-earth metal oxides and 3.1-36wt% of silicon oxide; the specific surface area of the catalyst is 60-180m2 / g; and the pore volume of the catalyst is 0.4-0.7ml / g. The precursor of the carrier of the silicon-containing alumina is pseudo-boehmite containing amorphous silica-alumina, which is prepared by the following steps of: firstly preparing amorphous silica-alumina seriflux and pseudo-boehmite seriflux; mixing and ageing the two seriflux; and performing a post-processing process comprising filtering and drying on the mixture. The catalyst has high hydrogenation activity, high selectivity and good stability, is suitable for the selective hydrogenation of medium-low distillate oil, and is particularly suitable for the selective hydrogenation of unsaturated hydrocarbon such as diene and the like in an oil product.

Description

technical field [0001] The invention relates to a selective hydrogenation catalyst and a preparation method thereof. The catalyst is suitable for the selective hydrogenation of low and medium distillate oils, especially for the selective hydrogenation of diethylenic unsaturated hydrocarbons in oil products. Background technique [0002] In recent years, with the increasingly stringent environmental regulations, the requirements for sulfur content and nitrogen content in oil products have become more and more stringent; at the same time, because the quality of crude oil is getting worse and the content of impurities such as sulfur and nitrogen is getting higher and higher, the The requirements for hydrogen treatment catalysts are also getting higher and higher. For example, when hydrotreating coked diesel oil, higher content of nitrogen compounds, especially basic nitrogen compounds, will be adsorbed on the acidic sites of the catalyst, resulting in a decrease in desulfuriza...

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Problems solved by technology

[0004] CN1267187C discloses a silica-alumina containing pseudo-boehmite structure, the carrier silica content is high, and the silicon-containing compound solution is directly or co-currently introduced into the pseudo-boehmite slurry, the purpose It is to increase the four-coordinated aluminum content to increase the acid strength and acid amount of alumina. The prepared silicon-containing alumina has high cracking activity, but the higher cracking activity is used as a hydrogenation catalyst carrier, which reduces the liquid yield.

However, the composite oxide prepared by this method has a large number of micropores, which is not suitable for use as a carrier for hydrotreating catalysts for low- and medium-distillate oils.

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