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Method for preparing anti-pulverization skeletal nickel catalyst

A technology of skeleton nickel and catalyst, which is applied in the field of preparation of anti-powdering skeleton nickel catalyst, can solve the problems of aggravated catalyst skeleton structure damage and pulverization, increased catalyst consumption cost, and reduced reactivity, etc., and achieves strong anti-powdering performance, mechanical Increased strength, strong chalking resistance and friction impact resistance

Inactive Publication Date: 2017-08-11
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for the traditional skeleton nickel catalyst used in the jet loop reactor, because its mixing strength is significantly higher than that of the ordinary tank reactor, the irregular structure of the outer surface of the catalyst particles needs to withstand the increase of friction and impact external force, which will inevitably aggravate the destruction of the catalyst skeleton structure. Pulverization, causing permeation loss during catalyst filtration and recovery, which in turn causes a decrease in reactivity and an increase in catalyst consumption costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of an anti-powdering framework nickel catalyst, comprising the following steps:

[0023] (1) Metal Ni, metal Al and metal Zr are mixed in proportion, and the mass ratio of metal Zr to metal Ni is 0.01:1; the obtained metal mixture is mixed and melted at 1500°C and then subjected to high-pressure atomization to obtain alloy microsphere powder , and use an automatic sieving machine to sieve the alloy powder, and sieve out 80-120 mesh alloy microsphere powder for catalyst activation.

[0024] (2) The alloy microsphere powder obtained in step (1) is activated by immersion in a potassium hydroxide solution with a mass concentration of 25%. The leaching process is protected by nitrogen gas, and the metal salt Zr(NO 3 ) 4 ; Zr(NO 3 ) 4 The mass ratio to the potassium hydroxide solution is 0.1:1; the leached alloy powder is washed with deionized water for several times until weakly alkaline to neutral, and then the skeleton nickel catalyst is obtained, w...

Embodiment 2

[0030] A preparation method of an anti-powdering framework nickel catalyst, comprising the following steps:

[0031] (1) Metal Ni, metal Al and metal Cr are mixed in proportion, and the mass ratio of metal Cr to metal Ni is 0.025:1; the obtained metal mixture is mixed and melted at 2200°C and then subjected to high-pressure atomization to obtain alloy microsphere powder , and use an automatic sieving machine to sieve the alloy powder, and sieve out 100-150 mesh alloy microsphere powder for catalyst activation.

[0032] (2) The alloy microsphere powder obtained in step (1) is activated by immersion in a potassium hydroxide solution with a mass concentration of 35%. The leaching process is protected by argon gas, and metal salt K is added in proportion to the potassium hydroxide solution. 2 CrO 4 , K 2 CrO 4 The mass ratio to the potassium hydroxide solution is 0.2:1; the leached alloy powder is washed with deionized water for several times until it is weakly alkaline to neut...

Embodiment 3

[0035] A preparation method of an anti-powdering framework nickel catalyst, comprising the following steps:

[0036](1) Mix metal Ni, metal Al, and metal Mo in proportion, and the mass ratio of metal Mo to metal Ni is 0.04:1; the resulting metal mixture is mixed and melted at 2000°C and then subjected to high-pressure atomization to obtain alloy microsphere powder , and use an automatic sieving machine to sieve the alloy powder, and sieve out 200-250 mesh alloy microsphere powder for catalyst activation.

[0037] (2) The alloy microsphere powder obtained in step (1) is activated by immersion in potassium hydroxide solution with a mass concentration of 30%. The leaching process is protected by helium gas, and metal salt K is added in proportion to the potassium hydroxide solution. 2 MnO 4 ;K 2 MnO 4 The mass ratio to the potassium hydroxide solution is 0.15:1; the leached alloy powder is washed with deionized water for several times until it is weakly alkaline to neutral, an...

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PUM

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Abstract

The invention relates to the field of catalyst preparation, and particularly discloses a method for preparing an anti-pulverization skeletal nickel catalyst. The method is characterized by comprising the following steps: mixing metal nickel, metal aluminum and metal X, melting the metal mixture, atomizing at high pressure to obtain alloy microspherical powder, and screening for later use; infiltrating and activating the alloy microspherical powder with an alkaline liquor, adding metal salt M into the alkaline liquor, washing the infiltrated alloy microspherical powder with deionized water until the powder is weakly alkaline to neutral to obtain the skeletal nickel catalyst, and sealing with liquid for preservation. The skeletal nickel catalyst has high catalytic activity, good stability and long service life, the outer surfaces of catalyst particles have a regular structure, the mechanical strength is remarkably improved, and the anti-pulverization and friction impact resistance are strong. The method is applicable to conventional slurry bed reactors, and can meet strict use requirement for jet loop reactors with high mixing strength.

Description

[0001] (1) Technical field [0002] The invention relates to the field of catalyst preparation, in particular to a preparation method of an anti-powdering framework nickel catalyst. [0003] (2) Background technology [0004] Skeleton nickel, also known as Raney nickel, was first prepared and named by Raney in 1925. It has high hydrogenation reaction activity and good reaction selectivity. It is comparable to traditional platinum, palladium, rhodium, ruthenium and other noble metal catalysts Compared with, it has the advantages of simple preparation method and low price, so it is widely used in catalytic hydrogenation reaction in petrochemical field. [0005] The alloy main body composed of Ni and Al forms an irregular skeleton shape on the outer surface after activation treatment such as alkaline solution immersion, and a large number of cracks and voids appear in the structure. Cracks and voids are relatively loose and inhomogeneous states in the metal structure, and their e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J25/02
CPCB01J25/02B01J35/30
Inventor 丁军委于文龙刘福胜李明
Owner QINGDAO UNIV OF SCI & TECH
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