Method for preparing multi-nuclear-shell hollow nickel-nickel silicate-CeO2 through methane reforming

A hollow, silicate technology, used in chemical instruments and methods, catalyst activation/preparation, inorganic chemistry, etc., can solve problems such as loss of high specific surface area

Inactive Publication Date: 2018-11-13
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, these metal silicates are only used as catalyst precursors. After high-temperature reduction, the metal silicates are completely decomposed and lose their advantages of high specific surface area.

Method used

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  • Method for preparing multi-nuclear-shell hollow nickel-nickel silicate-CeO2 through methane reforming
  • Method for preparing multi-nuclear-shell hollow nickel-nickel silicate-CeO2 through methane reforming
  • Method for preparing multi-nuclear-shell hollow nickel-nickel silicate-CeO2 through methane reforming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) 200mL ethanol, 100mL water and 40mL orthosilicate methyl ester at 0 o Mix and stir evenly at C, then add urea to adjust the pH to 10. After stirring for 2h, it was separated with a centrifuge and washed with a mixture of methanol and water. Finally, 600nm silica nanoparticles were obtained at 150 o C dried for 24h.

[0025] (2) Take 2g of silicon dioxide and 0.3g of nickel nitrate, add ammonia water, and adjust the pH to 8. Put the mixed solution into the autoclave and heat to 50 o C degree, after reacting for 24h, cool to room temperature. Centrifuge, wash with methanol, ethanol, and water, and place in a 100-degree drying oven. Obtain nickel silicate hollow spheres (such as figure 2 shown), the specific area is 250m 2 g -1 .

[0026] (3) Disperse hollow nickel silicate spheres in a mixed solution of ethanol (10mL) and water (20mL). After stirring for 30 min, cerium nitrate (3 g) and ammonia water (30 mL) were added. Raise the reaction temperature to 40...

Embodiment 2

[0030] (1) 200mL ethanol, 100mL water and 40mL methyl orthosilicate at 35 o C and mix well. Add urea to adjust the pH to 10. After stirring for 2h, it was separated with a centrifuge. Wash with a mixture of methanol and water. Finally, 600nm silica nanoparticles were obtained at 150 o C dried for 24h.

[0031] (2) Take 2g of silicon dioxide and 0.3g of nickel nitrate, add ammonia water, and adjust the pH to 11. Put the mixed solution into the autoclave and heat it to 135 o C degree, after reacting for 24h, cool to room temperature. Centrifuge and wash with methanol, ethanol, water, and then prevent from a 100-degree drying oven. Obtain nickel silicate hollow spheres (such as figure 2 shown), the specific area is 250m 2 g -1 .

[0032] (3) Disperse hollow nickel silicate spheres in a mixed solution of ethanol (10mL) and water (20mL). After stirring for 30 min, cerium nitrate (3 g) and ammonia water (30 mL) were added. Raise the reaction temperature to 95 o C, rea...

Embodiment 3

[0036] (1) 200mL ethanol, 100mL water and 40mL methyl orthosilicate at 70 o C and mix well. Add urea to adjust the pH to 10. After stirring for 2h, it was separated with a centrifuge, and washed with methanol and water. Finally, 600nm silica nanoparticles were obtained at 150 o C dried for 24h.

[0037] (2) Take 2g of silicon dioxide and 0.3g of nickel nitrate, add ammonia water, and adjust the pH to 13. Put the mixed solution into the autoclave and heat to 220 o C degree, after reacting for 24h, cool to room temperature. Centrifuge and wash with methanol, ethanol, water, and then prevent from a 100-degree drying oven. Obtain nickel silicate hollow spheres (such as figure 2 shown), the specific area is 250m 2 g -1 .

[0038] (3) Disperse hollow nickel silicate spheres in a mixed solution of ethanol (10mL) and water (20mL). After stirring for 30 min, cerium nitrate (3 g) and ammonia water (30 mL) were added. Raise the reaction temperature to 150 o C, reacted for 4...

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Abstract

The invention discloses a method for preparing multi-nuclear-shell hollow nickel-nickel silicate-CeO2 through methane reforming. The method includes the steps of (1) preparing silicon dioxide nanoparticles; (2) adding nickel precursors into the silicon dioxide nanoparticles, and preparing hollow nickel silicate spheres at the temperature of 50-220oC; (3) dispersing the hollow nickel silicate spheres into mixed liquor of ethyl alcohol and water, adding CeO2 precursors and precipitators, and performing reaction at the temperature of 40-150oC to obtain nickel silicate-CeO2 nuclear shell hollow nanospheres; (4) reducing the nickel silicate-CeO2 nuclear shell hollow nanospheres to obtain the high-dispersion nickel-nickel silicate-CeO2 multi-nuclear-shell hollow catalyst. The prepared multi-nuclear-shell hollow nickel-nickel silicate-CeO2 catalyst has the advantages of high sintering resistance on nickel and CeO2, hyperoxia hole concentration, high carbon deposition resistance, high nickel dispersity, high CeO2 dispersity and the like, and displays high catalytic activity and carbon deposition resistance when being applied to catalytic reaction based on low-temperature methane reforming.

Description

technical field [0001] The invention relates to a methane reforming multi-core shell hollow nickel-nickel silicate-CeO 2 The preparation method belongs to CH 4 The technical field of reforming multi-core-shell hollow catalysts. Background technique [0002] Nickel-based catalysts have been widely studied at home and abroad because of their low price and high catalytic activity for reforming. When they are applied to CH 4 During the dry reforming reaction, carbon deposition on nickel-based catalysts is relatively serious, mainly because the sintering of nickel metal promotes the occurrence of carbon deposition side reactions. especially when CH 4 Dry reforming reaction temperature below 600 o C, the carbon deposition phenomenon is more serious. The present inventor has developed a core-shell structure catalyst, which can effectively prevent metal sintering. However, these core-shell structures generally suffer from low specific surface area and low mass transfer efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J35/08B01J37/03B01J37/10B01J37/18C01B3/40
CPCB01J23/83B01J35/0013B01J35/006B01J35/008B01J35/0093B01J35/08B01J37/031B01J37/033B01J37/10B01J37/18C01B3/40C01B2203/0238C01B2203/1058C01B2203/1241Y02P20/52
Inventor 李自卫李敏
Owner GUIZHOU INST OF TECH
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