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Microspherical silica/alumina-based noble metal catalyst and preparation method thereof

A noble metal catalyst and noble metal technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of weak silicon-aluminum bonding, lower specific surface area, and lower catalytic activity and other problems, to achieve the effect of high wear resistance, small wear index and high catalytic activity

Active Publication Date: 2019-10-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results show that the silicon-containing alumina prepared by this method has a large specific surface area and concentrated pore distribution, but the silicon-alumina bond is weak after simple mechanical mixing, resulting in poor sample stability, because its silicon source is sodium silicate, in order to ensure that the product With low sodium content, the washing process will generate a lot of waste water
Liang et al. studied impregnation loading SiO in Study on Production Technology of Isobutane Dehydrogenation Fluid Catalyst (Catal.Commun.2007,4,131-136). 2 For Microspherical K 2 O-CrO x / Al 2 o 3 The influence of catalyst surface properties and catalytic activity, the results show that supported SiO 2 Afterwards, the stability of the catalyst is enhanced, but the catalytic activity is reduced, the reason is that the impregnation method supported SiO 2 clogged al 2 o 3 Part of the pores of the carrier leads to a decrease in the specific surface, which affects the active component CrO x The degree of dispersion, which affects its catalytic activity

Method used

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  • Microspherical silica/alumina-based noble metal catalyst and preparation method thereof
  • Microspherical silica/alumina-based noble metal catalyst and preparation method thereof
  • Microspherical silica/alumina-based noble metal catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A. Dissolve 10.00 g of aluminum powder with an average particle size of 50 μm in 100.00 g of hydrochloric acid solution with a mass concentration of 10% to prepare an aluminum sol.

[0032] B. Add 4.47g Na 2 SiO 3 9H 2 O was dissolved in 5.00 g of deionized water and passed through 001×7 (732) type strongly acidic polystyrene cation exchange resin to obtain silica sol.

[0033] C. Fully mix the above two solutions, then add 32.18g of hexamethylenetetramine solution (40wt%), and stir evenly. It is delivered to the dispersing nozzle by a peristaltic pump at a flow rate of 20mL / min, and then injected into No. 25 transformer oil at a temperature of 80°C at a pressure of 0.15MPa for molding. The shaped microspheres were separated from the oil and aged in an oven at 130°C for 5h.

[0034] D. The above product is filtered and washed, dried at 90°C for 12h, and then roasted in a muffle furnace at 960°C for 4h to obtain SiO 2 4% Microspherical SiO 2 -Al 2 o 3 carrier.

...

Embodiment 2

[0041] A. Dissolving 12.00 g of aluminum powder with an average particle size of 50 μm in 100.00 g of hydrochloric acid solution with a mass concentration of 10% to prepare aluminum sol.

[0042] B. Add 6.86g Na 2 SiO 3 9H 2 O was dissolved in 7.00 g of deionized water and passed through 001×12 type strongly acidic polystyrene cation exchange resin to obtain silica sol.

[0043] C. Mix the above two solutions thoroughly, then add 34.32g of hexamethylenetetramine solution (40wt%), and stir evenly. It is delivered to the dispersing nozzle by a peristaltic pump at a flow rate of 20mL / min, and then injected into No. 25 transformer oil at a temperature of 80°C at a pressure of 0.15MPa for molding. The shaped microspheres were separated from the oil and aged in an oven at 130°C for 5h.

[0044] D. The above product is filtered and washed, dried at 90°C for 12h, and then roasted in a muffle furnace at 1000°C for 4h to obtain SiO 2 6% Microspherical SiO 2 -Al 2 o 3 carrier.

...

Embodiment 3

[0047] A. Dissolving 14.00 g of aluminum powder with an average particle size of 50 μm in 100.00 g of hydrochloric acid solution with a mass concentration of 10% to prepare aluminum sol.

[0048] B. Add 8.22g Na 2 SiO 3 9H 2 O was dissolved in 7.00 g of deionized water and passed through 7320 type strongly acidic polystyrene cation exchange resin to obtain silica sol.

[0049] C. Fully mix the above two solutions, then add 35.24g of hexamethylenetetramine solution (40wt%), and stir evenly. It is delivered to the dispersing nozzle by a peristaltic pump at a flow rate of 20mL / min, and then injected into No. 25 transformer oil at a temperature of 80°C at a pressure of 0.15MPa for molding. The shaped microspheres were separated from the oil and aged in an oven at 130°C for 5h.

[0050] D. The above product was filtered and washed, dried at 90°C for 12h, and then calcined in a muffle furnace at 1050°C for 4h to obtain SiO 2 8% Microspherical SiO 2 -Al 2 o 3 carrier.

[005...

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Abstract

The invention provides a microspherical SiO 2 ‑Al 2 O 3 Based noble metal catalyst and its preparation method. The preparation method used in the present invention is to disperse silica sol into the aluminum sol system, mix the silica sol with the aluminum sol and the coagulant to form a molded sol, and adopt the spray dispersion-oil column molding method. Shaping it, and then aging, washing, drying and baking to obtain microspherical SiO 2 ‑Al 2 O 3 . With this microspherical SiO 2 ‑Al 2 O 3 The carrier is loaded with precious metal active components to obtain microspherical SiO 2 ‑Al 2 O 3 Based precious metal catalyst. The catalyst has the characteristics of large specific surface and pore volume, high dispersion of active components, small wear index, and high wear resistance. The catalyst is mainly used in the hydrogenation process of preparing hydrogen peroxide by the fluidized bed anthraquinone method, and has high catalytic activity, selectivity and stability. The catalyst can also be used in reaction processes such as hydrorefining, selective hydrogenation and selective oxidation in petrochemical and fine chemical production.

Description

[0001] Field [0002] The invention relates to the field of catalyst preparation, in particular to a catalyst for the hydrogenation process of preparing hydrogen peroxide by a fluidized bed anthraquinone method. Background technique [0003] The fluidized bed process is widely used in gas-solid, liquid-solid and gas-liquid-solid phase reaction processes in chemical industry, petroleum, energy, environmental protection and metallurgy. This process has the advantages of less catalyst addition, excellent mass transfer performance and reactant conversion efficiency. High advantages, fluidized bed reactor and fluidized bed process are the most ideal for reactions with high requirements on gas-liquid flux, production capacity and reaction speed, especially for reactions with strong exotherm and need to keep the reactor temperature stable Therefore, in some important reaction processes, it has become a trend to replace the original fixed bed process with fluidized bed process. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/52B01J35/08B01J35/10
CPCB01J23/42B01J23/44B01J23/52B01J35/51B01J35/615B01J35/635B01J35/647
Inventor 李殿卿张伟贺宇飞冯拥军
Owner BEIJING UNIV OF CHEM TECH
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