Selective hydrogenation catalyst, preparation method and application thereof

A technology for selective hydrogenation and catalysts, applied in the direction of selective hydrogenation refining, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems to be further improved, and achieve low-temperature hydrogenation High activity, stable hydrogenation activity and high selectivity

Inactive Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ability to resist As, S, O, and N impurities still needs to be further improved

Method used

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  • Selective hydrogenation catalyst, preparation method and application thereof
  • Selective hydrogenation catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] step 1:

[0037] (1) 1.5molAl (NO 3 ) 3 9H 2 O crystals were added to the corresponding volume of deionized water to make them fully dissolved and prepared into a 1.55mol / L aluminum salt solution (A).

[0038] (3) 0.025mol Mg (NO 3 ) 2 ·6H 2 O crystals were added to the corresponding volume of deionized water to make it fully dissolved and prepared into a 0.025mol / L solution (B),

[0039] (4) Calculate the amount of the corresponding (A) and (B) solutions according to the mass percentage of the component MgO as 1%, and mix them uniformly to obtain the mixed solution (C) containing Mg and Al

[0040] (5) Using co-current co-precipitation method, add (NH 4 ) 2 CO 3 solution or ammonia solution and the prepared mixed solution (C) containing Mg and Al, the dropping rate of the mixed solution (C) is 30 drops / min, (NH 4 ) 2 CO 3 Or the dropping rate of the ammonia solution is 20 drops / min; finally, adjust the pH of the precipitate to pH=8 with ammonia water, and f...

Embodiment 2

[0045] The method is the same as that in Example 1, except that the Ce weight content in the catalyst is 2.5 wt%, and Catalyst 2 is prepared. See Table 1 for details.

Embodiment 3

[0047]The method is the same as in Example 1, except that the molar ratio of metallic nickel to citric acid in the impregnating solution in step 2 is 3:1, and the Ce weight content in the catalyst is 2.5wt%, to obtain catalyst 3. See Table 1 for details.

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Abstract

The invention provides a selective hydrogenation catalyst, a preparation method and an application thereof. The selective hydrogenation catalyst employs magnesium oxide-aluminium oxide as a carrier, rare earth elements, preferably cerium or praseodymium, as additives, and a transition metal nickel as an active component. The catalyst carrier is prepared in a manner of a co-current-flow co-precipitation method. The metal active component and the additives are carried on the carrier in a manner of a co-impregnation method with addition of a certain amount of citric acid to an impregnation solution. The content of the nickel metal is 10%-20% based on the total weight of the catalyst and the content of the additives is 1-3% based on the total weight of the catalyst. The catalyst can be used for hydrogenation of C5-C9 fractions, especially of C8-C9 heavy fractions, in pyrolysis gasoline. The catalyst is high in low-temperature activity and selectivity, is strong in anti-impurity performance, wherein the impurities includes arsenic, sulphur, oxygen and nitrogen, is large in gel-accommodating capacity and is stable in activity during a long-period operation.

Description

technical field [0001] The invention relates to the field of hydrogenation catalysts, in particular to a catalyst for selective hydrogenation of petroleum hydrocarbons, and also relates to a preparation method and application of the catalyst. Background technique [0002] The C5-C9 fraction of pyrolysis gasoline is a by-product of the ethylene industry. According to the different cracking raw materials and cracking depths, its output accounts for more than 50% by weight of the ethylene production capacity, and the content of aromatics accounts for 40-80% by weight, so it is the main aromatics. source. In industrial production, cut C8 and C9 fractions, undergo one-stage hydrogenation, remove highly unsaturated hydrocarbons, such as chain conjugated dienes, styrene, alkynes and cyclic conjugated dienes, and then undergo two-stage hydrodesulfurization, After removing monoenes and organic compounds such as sulfur, nitrogen, and oxygen, the C8 fraction is used to produce xylene,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C10G45/36
Inventor 纪玉国柴忠义任玉梅季静张富春
Owner CHINA PETROLEUM & CHEM CORP
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