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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 methane reforming multi-core shell hollow catalyst nickel-nickel silicate-SiO 2 The preparation method is characterized in that the method includes the following steps: (1) First prepare silica nanoparticles; (2) Take silica nanoparticles with a particle size of 500nm ~ 1µm and prepare them to a concentration of 1g / L ~ 10g / L, add alkali solution to adjust the pH to 8-13, add nickel precursor with a concentration of 1g / L ~ 10g / L, and adjust the temperature to 50 o C~220 o Synthesize nickel silicate hollow spheres under C conditions; (3) Disperse nickel silicate hollow spheres in a mixed solution of surfactant and water, add alkali solution after stirring, adjust the pH to 10-14, and add 10 mL Teethyl orthosilicate reacts at room temperature to prepare nickel silicate-SiO 2 Core-shell hollow sphere; (4) Nickel silicate-SiO 2 The core-shell hollow sphere has a temperature of 300 o C~800 o C is reduced in a hydrogen atmosphere to obtain highly dispersed nickel-nickel silicate-SiO 2 Multi-core shell hollow catalyst. The catalyst prepared by the invention has the advantages of high sintering resistance, 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
CPCC01B3/40B01J23/755B01J35/394B01J35/393B01J35/50Y02P20/52
Inventor 李敏李自卫
Owner GUIZHOU INST OF TECH
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