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Preparation method and application of Raney Ni catalyst suitable for methanation of fixed bed

A technology of Raney nickel and catalyst, which is applied in the field of Raney nickel catalyst and its preparation, can solve the problems of nickel foam particle size and pore structure changes, and achieve the goal of improving conversion rate, stable and reliable preparation conditions, and improving conversion rate and selectivity Effect

Inactive Publication Date: 2014-10-08
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of the nickel foam in this preparation method has been fixed, and the nickel foam is impregnated with aluminum, and the particle size and pore structure of the nickel foam have substantial changes after the aluminum is extracted with alkali.
[0007] The methanation catalysts disclosed in the above two patents are all fixed-bed catalysts, but there is no report on the application of Raney nickel catalysts to methanation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Pretreatment: Grind nickel-aluminum alloy powder containing 35% nickel into 40-mesh particles, soak in toluene for 30 minutes, then soak in absolute ethanol for 6 minutes, then wash with deionized water for 3 times, and dry in vacuum at 70°C 1 hour, cool to room temperature and set aside.

[0041] (2) Preparation of Raney nickel catalyst: a stainless steel container with a concentration of 85.0ml of 4mol / L NaOH solution is placed in a 20°C water bath in advance, then the magnetic field generator is installed outside the constant temperature water tank, and the magnetic field strength is adjusted to 15T, 20.0g of dried nickel-aluminum alloy powder was added to the above NaOH solution at a stirring rate of 600r / min, and then stirred at a constant temperature of 25°C for 4h. After the reaction, the upper layer of lye was removed.

[0042] (3) Adjust the magnetic field intensity to 10T, rinse repeatedly to neutrality with deionized water, then rinse 3 times with absolut...

Embodiment 2

[0046] (1) Pretreatment: Grind nickel-aluminum alloy powder containing 45% nickel into 60-mesh particles, soak in acetone for 20 minutes, then soak in absolute ethanol for 5 minutes, then wash with deionized water for 3 times, and dry in vacuum at 80°C 2 hours, cool to room temperature and set aside.

[0047] (2) Preparation of Raney nickel catalyst: a stainless steel container with a concentration of 70.0ml of 5mol / L NaOH solution is placed in a 15°C water bath in advance, then the magnetic field generator is installed outside the constant temperature water tank, and the magnetic field strength is adjusted to At 18T, add 16.0g of dried nickel-aluminum alloy powder to the above NaOH solution at a stirring rate of 500r / min, then stir at a constant temperature of 30°C for 6h, and remove the upper layer of alkali solution after the reaction.

[0048] (3) Adjust the magnetic field intensity to 13T, rinse repeatedly to neutrality with deionized water, then rinse 3 times with absolu...

Embodiment 3

[0052] (1) Pretreatment: Grind nickel-aluminum alloy powder containing 60% nickel into 80-mesh particles, soak in ether for 40 minutes, then soak in absolute ethanol for 8 minutes, then wash with deionized water for 3 times, and dry in vacuum at 110°C 2 hours, cool to room temperature and set aside.

[0053] (2) Preparation of Raney nickel catalyst: the stainless steel container of 4.5mol / L NaOH solution with a concentration of 80.0ml is placed in a 10°C water bath in advance, and then the magnetic field generator is installed outside the constant temperature water tank to adjust the magnetic field strength For 25T, 15.0g of dried nickel-aluminum alloy powder was added to the above NaOH solution at a stirring rate of 450r / min, and then stirred at a constant temperature of 40°C for 5h. After the reaction, the upper alkali solution was removed.

[0054] (3) Adjust the magnetic field intensity to 15T, rinse repeatedly to neutrality with deionized water, then rinse 4 times with ab...

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Abstract

The invention discloses a Raney Ni catalyst suitable for methanation of a fixed bed. The Raney Ni catalyst is characterized in that the Ni content is 86wt%-95wt% and the specific surface area is between 85 and 180 m<2> / g. The Raney Ni catalyst suitable for methanation of the fixed bed has the advantages that the particle size is uniform, the mechanical strength is high, the catalytic activity is good and the Raney Ni catalyst is suitable for large-scale production.

Description

technical field [0001] The invention relates to a Raney nickel catalyst and a preparation method, in particular to a Raney nickel catalyst suitable for fixed-bed methanation, a preparation method and an application. Background technique [0002] Raney nickel (Raney Ni) catalyst is a very important industrial catalyst, which has high activity and selectivity and low production and use cost, and has been widely used in the catalytic hydrogenation reaction of organic matter. Raney Ni catalyst was first discovered by Murray Raney and applied for a patent in 1925. When the catalyst is prepared, the Al in the aluminum-nickel alloy is first dissolved with NaOH solution, and then washed. The residue is a skeleton structure similar to a sponge. The catalyst mainly contains Ni and Al, and the total specific surface area is 50-130m 2 / g. [0003] The traditional method of preparing Raney nickel is to extract the prepared nickel-aluminum alloy with a certain concentration of alkali so...

Claims

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Application Information

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IPC IPC(8): B01J25/02B01J35/10C10L3/08
Inventor 崔晓曦张庆庚李晓曹会博
Owner SEDIN ENG
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