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Methane reforming multi-core-shell hollow catalyst nickel-nickel silicate-sio 2 preparation method

A hollow, silicate technology, used in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as loss of high specific surface area

Inactive Publication Date: 2020-10-30
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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  • Methane reforming multi-core-shell hollow catalyst nickel-nickel silicate-sio <sub>2</sub> preparation method
  • Methane reforming multi-core-shell hollow catalyst nickel-nickel silicate-sio <sub>2</sub> preparation method
  • Methane reforming multi-core-shell hollow catalyst nickel-nickel silicate-sio <sub>2</sub> preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) 200mL ethanol, 100mL water and 40mL orthosilicate methyl ester at 0o 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.

[0027] (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 an autoclave, heat to 50°C, react for 24 hours, and cool to room temperature. Centrifuge, wash with methanol, ethanol, and water, and put it into a 100-degree drying oven. Obtain nickel silicate hollow spheres (such as figure 2 , shown in 3), the specific area is 250m 2 g -1 .

[0028] (3) Disperse hollow nickel silicate spheres in ethanol (30mL), water (10mL), C n TAB (n=10) (30mg) in the mixed solution. After stirring for 30 min, aqueous ammonia (30 mL) was added. The pH was adjusted to 10, and after stirring for 30 min, 10 ...

Embodiment 2

[0032] (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.

[0033] (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 an autoclave, heat to 50°C, react for 24 hours, and cool to room temperature. Centrifuge, wash with methanol, ethanol, and water, and put it into a 100-degree drying oven. Obtain nickel silicate hollow spheres (such as figure 2 , shown in 3), the specific area is 250m 2 g -1 .

[0034] (3) Disperse hollow nickel silicate spheres in ethanol (30mL), water (10mL), C n TAB (n=10) (30mg) in the mixed solution. After stirring for 30 min, aqueous ammonia (30 mL) was added. The pH was adjusted to 12, and after stirring for 30 min, 10 mL...

Embodiment 3

[0038] (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. Wash with a mixture of methanol and water. Finally, 600nm silica nanoparticles were obtained at 150 o C dried for 24h.

[0039] (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 an autoclave, heat to 50°C, react for 24 hours, and cool to room temperature. Centrifuge, wash with methanol, ethanol, and water, and put it into a 100-degree drying oven. Obtain nickel silicate hollow spheres (such as figure 2 , shown in 3), the specific area is 250m 2 g -1 .

[0040] (3) Disperse hollow nickel silicate spheres in ethanol (30mL), water (10mL), C n TAB (n=10) (30mg) in the mixed solution. After stirring for 30 min, aqueous ammonia (30 mL) was added. The pH was adjusted to 14, and after stirring for 30 min, 10 mL...

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Abstract

The invention discloses a preparation method of a multi-nuclear-shell hollow type catalyst nickel-nickel silicate-SiO2 based on methane reforming. The preparation method is characterized by includingthe following steps: (1) preparing silicon dioxide nanoparticles; (2) preparing the silicon dioxide nanoparticles with the particle size of 500 nanometers to 1 micrometer into a solution with the concentration of 1-10g / L, adding alkali liquor to adjust the pH to 8-13, adding nickel precursors with the concentration of 1-10g / L, and synthesizing into hollow nickel silicate spheres at the temperatureof 50-220 DEG C; (3) dispersing the hollow nickel silicate spheres into mixed liquor of surfactants and water, adding the alkali liquor after stirring, adjusting the pH to 10-14, and adding 10mL of tetraethoxysilane for room-temperature reaction to obtain nickel silicate-SiO2 nuclear shell hollow spheres; (4) reducing the nickel silicate-SiO2 nuclear shell hollow spheres under a hydrogen atmosphere with the temperature of 300-800 DEG C to obtain the high-dispersion nickel-nickel silicate-SiO2 multi-nuclear-shell hollow type catalyst. The prepared catalyst has the advantages of high sinteringresistance, high carbon deposition resistance, high-temperature stability and high specific surface area.

Description

technical field [0001] The invention relates to nickel-nickel silicate-SiO as a multi-core-shell hollow catalyst for methane reforming 2 The preparation method belongs to the technical field of chemical production. 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 efficiency. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755C01B3/40
CPCB01J23/755B01J35/006B01J35/0066B01J35/026C01B3/40Y02P20/52
Inventor 李敏李自卫
Owner GUIZHOU INST OF TECH
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