Eggshell type nickel-based catalyst

A nickel-based catalyst, catalyst technology, applied in molecular sieve catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of affecting the life of the catalyst, affecting the selectivity of the catalyst, etc., to achieve high repeatability, and the preparation method is simple and easy. Operation, the effect of improving selectivity

Active Publication Date: 2010-11-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the product molecules generated by the reaction deep in the catalyst pores cannot diffuse out in time to further react, on the one hand, it will affect the selectivity of the catalyst, and on the other hand, it will affect the life of the catalyst.

Method used

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  • Eggshell type nickel-based catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Nickel nitrate hexahydrate is dissolved in ammonia water to make an impregnating solution. The ammonia water used is mixed with commercially available 25% to 28% ammonia water and water at a weight ratio of 1:0.5, and the spherical alumina carrier is impregnated by an equal impregnation method. The alumina carrier is produced by Beijing Research Institute of Chemical Industry, with a specific surface area of ​​250m 2 / g, the pore volume is 0.44ml / g, dried at 120°C for 4 hours, calcined at 420°C for 4 hours, and then reduced with hydrogen at 350°C for 8 hours to prepare catalyst A, by weight of the catalyst, containing 10% nickel by weight. Cutting the catalyst ball particles in half, it can be clearly seen that the nickel component is distributed from the surface of the support to the catalyst body at a depth of 0.7 mm, and basically no nickel component can be seen in the spherical core region with a depth greater than 0.7 mm.

Embodiment 2

[0026] Nickel nitrate hexahydrate is dissolved in ammonia water to make impregnating solution. The ammonia water used is mixed with commercially available 25%-28% ammonia water and water at a weight ratio of 1:0.3, and the spherical alumina carrier is impregnated by an equal impregnation method. The alumina carrier is produced by Beijing Research Institute of Chemical Industry, with a specific surface area of ​​274m 2 / g, the pore volume is 0.45ml / g, first dry at 60°C for 4 hours, then dry at 120°C for 4 hours, then bake at 420°C for 4 hours, then impregnate again, dry, bake, and use hydrogen Reduction at 375° C. for 8 hours prepared Catalyst B, which contained 20% by weight of nickel based on the weight of the catalyst. Cutting the catalyst ball particles in half, it can be clearly seen that the nickel component is distributed from the surface of the support to the catalyst body at a depth of 0.7 mm, and basically no nickel component can be seen in the spherical core region w...

Embodiment 3

[0028] Dissolve nickel nitrate hexahydrate in ammonia water to make impregnation solution. The ammonia water used is mixed with commercially available 25%-28% ammonia water and water at a weight ratio of 1:0.1, and the spherical alumina carrier is sprayed by spraying method. The carrier is produced by Beijing Research Institute of Chemical Industry, with a specific surface area of ​​264m 2 / g, the pore volume is 0.45ml / g, first dry at 60°C for 4 hours, then dry at 120°C for 4 hours, then bake at 420°C for 4 hours, then repeat the above process, and finally use hydrogen at 375°C After 8 hours of reduction, catalyst C was prepared, which contained 22% by weight of nickel based on the weight of the catalyst. Cutting the catalyst ball particles in half, it can be clearly seen that the nickel component is distributed from the surface of the support to the catalyst body at a depth of 0.7 mm, and no nickel component can be seen in the spherical core region with a depth greater than 0...

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Abstract

The invention discloses an eggshell type nickel-based catalyst and a preparation method and application thereof, belonging to the technical field of nickel-based catalysts and aiming at developing the eggshell type nickel-based catalyst for meeting the demand. The research shows that the eggshell type nickel-based catalyst can be prepared by dissolving nickel salt into ammonia water solution, loading the mixed solution on a catalyst carrier by adopting a spraying or immersing mode, drying, roasting and reducing. The active component of nickel is mostly centralized in an area from the surface of the carrier to the part of 0.7mm below the surface and can remarkably improve the conversion rate and the selectivity of the catalyst. The invention can be applied to the technical fields of hydrogen addition and trace amount of carbon monoxide removal from hydrogen and the like.

Description

technical field [0001] The present invention relates to a nickel-based catalyst, in particular, to an eggshell-type nickel-based catalyst in which the nickel component is distributed in the outer region of the catalyst. Background technique [0002] In the field of petrochemical industry, noble metal-supported catalysts and non-precious metal-supported catalysts are usually used in hydrogenation reactions, such as the use of palladium-supported noble metal catalysts in the selective hydrogenation of carbon distillates and carbon three distillates, gasoline hydrogenation and benzene hydrogenation Typically a nickel-supported non-noble metal catalyst is used. In order to make full use of expensive noble metals and improve the activity and selectivity of catalysts, noble metal-supported catalysts are generally prepared as eggshell catalysts, and with the continuous development of catalyst preparation technology, people make eggshells loaded with noble metals more and more thin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J29/072B01J37/00B01J37/02B01J37/16
Inventor 戴伟田保亮王秀玲唐国旗王翀
Owner CHINA PETROLEUM & CHEM CORP
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