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Preparation method of nickel-based catalyst, prepared catalyst and application thereof

A nickel-based catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of small porosity, La loss, catalyst specific surface area and Pore ​​volume reduction and other issues, to achieve excellent activity and selectivity effect

Active Publication Date: 2012-04-18
CHNA ENERGY INVESTMENT CORP LTD +2
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Problems solved by technology

[0007] Disadvantages of adding rare earth metals by co-precipitation: During the co-precipitation process, La may be lost due to competitive precipitation or the formation of difficult-to-reduce compounds between La and Ni
[0008] Since the impregnation process needs to be repeatedly roasted first and then impregnated, the specific surface area and pore volume of the catalyst will decrease after repeated roasting, the porosity is small, the activity is low, and it is not conducive to large-scale industrial production.
Most of these catalysts are suitable for low temperature and normal pressure conditions, and are not suitable for methanation reactions under high temperature conditions

Method used

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  • Preparation method of nickel-based catalyst, prepared catalyst and application thereof

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preparation example Construction

[0055] Another aspect of the present invention relates to the preparation method of above-mentioned catalyst, comprises the following steps:

[0056] (a) providing a mixed aqueous solution containing a nickel salt, an optional non-aluminum carrier metal salt, and an optional manganese salt;

[0057] (b) precipitating the mixed aqueous solution of step (a) with a precipitating agent; optionally aging; solid-liquid separation to obtain solid precipitation;

[0058] (c) mixing the solid precipitate in step (b) with a rare earth salt solution, and impregnating to form an impregnating solution;

[0059] (d) Separating the impregnation liquid from solid to liquid to obtain the impregnated solid, and forming the impregnated solid into a catalyst slurry, optionally adding aluminum sol and mixing uniformly during the process of forming the impregnated solid into the catalyst slurry;

[0060] (e) granulating and optionally drying the catalyst slurry to obtain a catalyst material;

[0...

Embodiment 1

[0112] 4.87 kilograms of nickel nitrate hexahydrate and 1.569 kilograms of zirconium nitrate were dissolved (diluted) in deionized water respectively to prepare a 15% nickel nitrate solution, and simultaneously dissolve to obtain a 15% sodium carbonate solution.

[0113] Preheat the mixed solution of nickel and zirconium metal salts and sodium carbonate solution to 80°C, co-precipitate into the reaction kettle, adjust the pH value of the precipitation to 8, filter after the precipitation, and wash to obtain the co-precipitation filter cake. Add 10 kg of deionized water to the co-precipitation filter cake for beating, add 0.133 kg of lanthanum nitrate and 0.1325 kg of cerium nitrate to prepare the solution, the pH of the slurry preparation is 5.4, soak at 85 ° C for 20 minutes, and the catalyst impregnation solution Filter to obtain impregnation filter cake, add 5 kilograms of deionized water to make a slurry in filter cake, Al 2 o 3 3.6769 kg of aluminum sol solution with a w...

Embodiment 2

[0115] Obtain coprecipitation filter cake according to the steps of Example 1, add 10 kg of deionized water to the coprecipitation filter cake for beating, add 0.0998 kg of lanthanum nitrate and 0.1988 kg of cerium nitrate prepared solution, mix evenly, and the solid content of the slurry is 15% ,, the pH of the sizing solution is 5.4, impregnated at 85°C for 20 minutes, filtered the catalyst impregnated solution to obtain the impregnated filter cake, added 5 kg of deionized water to the filter and made a slurry, added Al 2 o 3 5.5145 kg of aluminum sol solution with a weight concentration of 10%, mix evenly, and keep the solid content of the slurry at about 15%, and the obtained slurry is spray-dried at a temperature of 300°C at the inlet and 180°C at the outlet, and roasted at 960°C After 6 hours, 2.140 kg of catalyst was obtained.

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Abstract

The invention relates to a preparation method of a nickel-based catalyst, the prepared catalyst and an application thereof. The invention relates to a method for preparing a nickel-based catalyst. The nickel-based catalyst comprises NiO, carrier, at least one rare-earth oxide RE2O3 and selectable MnO2. The method comprises the following steps: (a) providing a mixed aqueous solution containing nickel salt, selectable non-aluminum carrier metal salt and selectable manganese salt; (b) carrying out sediment with a precipitating agent, and carrying out solid-liquid separation to obtain solid precipitate; (c) mixing the solid precipitate and a rare earth salt solution to from a mixed solution, and dipping; (d) carrying out solid-liquid separation on the steeping liquid to obtain impregnant solids, and electively uniformly mixing the impregnant solids with alumina sol; (e) carrying out granulation and selectable drying; (f) roasting under the condition that the carrier is added in at least one step of the step (a) and step (d). The prepared catalyst has excellent activity and selectivity.

Description

technical field [0001] The invention relates to a preparation method of a nickel-based catalyst, a catalyst prepared therefrom and an application thereof. Background technique [0002] As a clean energy, natural gas is mainly composed of methane (CH 4 ). With the development of industry and the improvement of people's living standards, the demand for natural gas is currently showing rapid growth. However, the supply of natural gas in my country is far from enough to demand, and a large amount of natural gas is imported every year. [0003] Coal-to-natural gas technology consists of four parts: coal gasification, partial transformation, coal gas purification and methanation. The core of this route is coal gasification and methanation technology. The former is relatively mature, so methanation technology has attracted much attention. The key is the methanation catalyst. Due to the high content of syngas generated by the current coal gasification technology, the main reacti...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/83C10L3/08
Inventor 蔺华林李克健章序文杨葛灵李永伦
Owner CHNA ENERGY INVESTMENT CORP LTD
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