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A method for fixing active components of noble metal catalysts and its application

A technology of noble metal catalysts and active components, applied in the field of catalysis, can solve problems such as frequent start-up, shutdown and load-changing operations, accelerated aggregation and sintering of nano-scale catalysts, catalyst deactivation, etc., to prevent loss, improve stability, improve The effect of utilization

Active Publication Date: 2020-10-09
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the distributed unsteady reforming hydrogen production system, it is still faced with frequent start-up, shutdown and load-changing operations, the aggregation and sintering of nano-scale catalysts may be further accelerated, and eventually lead to catalyst deactivation

Method used

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  • A method for fixing active components of noble metal catalysts and its application
  • A method for fixing active components of noble metal catalysts and its application
  • A method for fixing active components of noble metal catalysts and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 181.5mg Cu(NO 3 ) 2 ·3H 2 Dissolve O in 10mL deionized water, configure a precursor solution of preset active components; weigh 6.2979g Ce(NO) 3 ·6H 2 O, 8.7600gZr(NO 3 ) 4 ·5H 2 O and deionized water are prepared into 100mL mixed aqueous solution; under stirring conditions, mix Cu(NO 3 ) 2 Solution and Ce(NO) 3 And Zr(NO 3 ) 4 Add 21.0297g of urea to the aforementioned mixed solution, and move the mixed solution to a water bath for heating; the temperature of the water bath is controlled to 80 ℃ while continuously stirring; when the pH value reaches 8.0, stop heating; when the solution temperature drops to room temperature , Stop stirring.

[0030] The precipitated product was separated by filtration, washed with deionized water, dried at 110°C for 12 hours, and calcined at 500°C for 4 hours to prepare a catalyst pre-support; this catalyst pre-support was immersed in 1.0 mol / L hydrazine hydrate aqueous solution for 10 hours.

[0031] Weigh 38.85mgH 2 PtCl 6 ·(H 2 O) 6 ...

Embodiment 2

[0034] Weigh 187.15mg Co(NO 3 ) 2 ·6H 2 Dissolve O in 10mL deionized water, configure a precursor solution of preset active components; weigh 12.5963g Ce(NO) 3 ·6H 2 O and deionized water are prepared into 100mL aqueous solution; under stirring conditions, mix Co(NO 3 ) 2 Solution and Ce(NO) 3 Solution; add 8.7279g of urea to the aforementioned mixed solution, and move the mixed solution to a water bath for heating; the temperature of the water bath is controlled to 90°C while continuously stirring; when the pH value reaches 9.0, the heating is stopped; when the temperature of the solution drops to room temperature, stop Stir.

[0035] The precipitated product was separated by filtration, washed with deionized water, dried at 110°C for 12 hours, and calcined at 500°C for 2 hours to prepare a catalyst pre-support; this catalyst pre-support was immersed in 1.0 mol / L hydrazine hydrate aqueous solution for 15 hours.

[0036] Weigh 40.06mgH 2 PtCl 6 ·(H 2 O) 6 Dissolve in 10 mL of deioni...

Embodiment 3

[0039] Weigh 117.98mg Cu(NO 3 ) 2 ·3H 2 Dissolve O in 10mL deionized water, configure a precursor solution of preset active components; weigh 6.2563g Ce(NO) 3 ·6H 2 O, 8.7021gZr(NO 3 ) 4 ·5H 2 O and deionized water are prepared into 100mL mixed aqueous solution; under stirring conditions, mix Cu(NO 3 ) 2 Solution and Ce(NO) 3 And Zr(NO 3 ) 4 Add 21.1386g of urea to the aforementioned mixed solution, and move this mixed solution to a water bath for heating; the temperature of the water bath is controlled to 80 ℃ while continuously stirring; when the pH value reaches 8.0, stop heating; when the solution temperature drops to room temperature , Stop stirring.

[0040] The precipitated product was separated by filtration, washed with deionized water, dried at 110°C for 12 hours, and calcined at 500°C for 2 hours to prepare a catalyst pre-support; this catalyst pre-support was immersed in 1.0 mol / L hydrazine hydrate aqueous solution for 15 hours.

[0041] Weigh 1.055 mL of 8.5% palladium ...

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Abstract

The invention belongs to the technical field of catalysis and in particular relates to a method for immobilizing active component of a noble metal catalyst and application of the noble metal catalyst.According to the method provided by the invention, cheap pre-set active components is introduced into a reaction system, and are displaced with the noble metal active components, so that the aim of immobilizing the noble metal active components of the catalyst is realized; the catalyst is prepared by the method exists in a form of metal oxide, and does not contain initial-stage pre-set active components including copper oxide and cobalt oxide, so that the stability of the noble metal catalyst can be greatly improved and the utilization rate of noble metal is improved. By adopting the method for immobilizing the active component of the noble metal catalyst, provided by the invention, nano-grade catalyst active components can be immobilized very well, and the loss of the active components can be effectively prevented; the problems of migration and agglomeration of a nano-grade catalysis active center are solved, so that the catalyst has relatively high activity and good stability. The catalyst prepared by the method is very suitable for catalytic reaction of reforming methane steam to produce hydrogen.

Description

Technical field [0001] The invention belongs to the technical field of catalysis, and specifically relates to a method for fixing active components of a precious metal catalyst and its application. Background technique [0002] 80% of the chemical industry processes (petroleum processing, traditional chemical industry, food industry, building materials industry, fine chemical industry, environmental protection industry, etc.) are realized by catalytic processes. The sales of the catalyst are in the range of US$10-20 billion. With the in-depth research of catalysts, scientists have discovered that due to the small size of nanoparticles, the surface area occupies a large volume percentage. The bonding and electronic states on the surface are different from those inside the particles. Incomplete coordination of surface atoms leads to surface activity. The increase of the position makes the nanoparticle catalyst have great advantages. Especially its huge specific surface area can g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C01B3/40
CPCB01J23/89B01J23/8913B01J23/894C01B3/40C01B2203/0233C01B2203/1064C01B2203/107C01B2203/1076Y02P20/52
Inventor 潘立卫张晶钟和香周毅
Owner DALIAN UNIV