Micro-spherical silicon oxide/aluminum oxide based noble metal catalyst and preparation method thereof

A precious metal catalyst, precious metal technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor sample stability, large quantities, and reduced specific surface area.

Active Publication Date: 2017-10-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 (

Method used

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  • Micro-spherical silicon oxide/aluminum oxide based noble metal catalyst and preparation method thereof
  • Micro-spherical silicon oxide/aluminum oxide based noble metal catalyst and preparation method thereof
  • Micro-spherical silicon oxide/aluminum oxide based noble metal catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055]...

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Abstract

The invention provides a micro-spherical SiO2-Al2O3 based noble metal catalyst and a preparation method thereof. The preparation method comprises the following steps: dispersing silica sol into a silica sol system, so that silica sol is mixed with alumina sol and a coagulant to form formed sol, forming the sol by virtue of an atomizing dispersion-oil column formation method, and carrying out aging, washing, drying and roasting to obtain micro-spherical SiO2-Al2O3; and loading noble metal active components with the micro-spherical SiO2-Al2O3 as a carrier, obtain the micro-spherical SiO2-Al2O3 based noble metal catalyst. The catalyst has the characteristics that the specific surface area and the pore volume are large, the dispersity of active components is high, the abrasion index is relatively low, and the wear resistance is high. The catalyst is mainly applied to a hydrogenation process of preparing hydrogen peroxide by using a fluidized bed anthraquinone method and has relatively high catalytic activity, selectivity and stability. The catalyst can be also applied to reaction processes such as hydrorefining, selective hydrogenation and selective oxidation in petrochemical engineering and fine chemical engineering 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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IPC IPC(8): B01J23/42B01J23/44B01J23/52B01J35/08B01J35/10
Inventor 李殿卿张伟贺宇飞冯拥军
Owner BEIJING UNIV OF CHEM TECH
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