Supported catalyst with kernel-shell structure, preparation method thereof and application

A supported catalyst, shell structure technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of limited practical application, high catalyst preparation cost, high precious metal content, and achieve increased contact , The effect of reducing production cost and high catalytic activity

Active Publication Date: 2015-08-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the alloy catalysts with better catalytic activity usually have high noble metal content, which leads to high preparatio

Method used

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  • Supported catalyst with kernel-shell structure, preparation method thereof and application
  • Supported catalyst with kernel-shell structure, preparation method thereof and application
  • Supported catalyst with kernel-shell structure, preparation method thereof and application

Examples

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Example Embodiment

[0049] Example 1

[0050] A supported catalyst NiNi-Pt / La with a core-shell structure of this embodiment 2 O 3 The preparation method is as follows:

[0051] (1) Preparation of supported non-precious metal precursor Ni / La by co-precipitation method 2 O 3 :

[0052] Add 20mL 2.1M TMAH ethanol solution at 60℃ and magnetic stirring, dropwise add 60mL 0.083M Ni(NO 3 ) 2 And 0.17M La(NO 3 ) 3 In the ethanol solution, react for 1h, transfer to a tetrafluoro-lined reactor, and react for 12h at 100℃ and sealed conditions. After centrifugal separation, the precipitate is obtained. The precipitate is dried at 60℃ for 12h, and then the precipitate is transferred into the tube In the furnace, sintered in air atmosphere and 500 ℃ temperature for 2h, and finally in the flow of H 2 Atmosphere and 500 ℃ temperature reduction for 1.5h, the supported non-precious metal precursor Ni / La is obtained 2 O 3 ;

[0053] (2) Preparation of supported catalyst NiNi-Pt / La with core-shell structure by replacement ...

Example Embodiment

[0070] Example 2

[0071] A supported catalyst NiNi-Pt / La with a core-shell structure of this embodiment 2 O 3 The preparation method is as follows:

[0072] (1) Preparation of supported non-precious metal precursor Ni / La by co-precipitation method 2 O 3 :Same as Example 1;

[0073] (2) Preparation of supported catalyst NiNi-Pt / La with core-shell structure by secondary displacement method 2 O 3 :

[0074] Under room temperature and magnetic stirring, the supported non-precious metal precursor Ni / La of step (1) 2 O 3 Place in 20mL K 2 PtCl 6 In aqueous solution (adjust K 2 PtCl 6 The concentration of the aqueous solution is such that the molar ratio of Pt element to Ni element in the catalyst is 1:18) Carry out the first replacement reaction, react for 1 hour, centrifuge to precipitate, and then wash the precipitate with water, alcohol, and dynamic vacuum drying at 30°C for 12 hours , And then flow H 2 Sintered in a tube furnace at 350℃ for 2h under the atmosphere, and then put the sin...

Example Embodiment

[0080] Example 3

[0081] A supported catalyst FeFe-Rh / CeO with core-shell structure of this embodiment 2 The preparation method is as follows:

[0082] (1) Preparation of supported non-precious metal precursor Fe / CeO by co-precipitation method 2 :

[0083] 20mL 1.6M TMAH ethanol solution, under 30℃ and magnetic stirring, add 60mL 0.067M Fe(NO 3 ) 3 And 0.067M Ce(NH 4 ) 2 (NO 3 ) 6 In the ethanol solution, react for 2h, then transfer it to a reactor lined with tetrafluoroethylene, and react for 12h at 80℃ and sealed conditions. After centrifugation, the precipitate is obtained. The precipitate is dried at 30℃ for 12h, and then the precipitate is transferred into the tube In the furnace, sintered in an air atmosphere and a temperature of 400 ℃ for 4 hours, and finally in the flow of H 2 Atmosphere and 450℃ temperature reduction for 3h, then the supported non-precious metal precursor Fe / CeO is obtained 2 ;

[0084] (2) Preparation of supported catalyst FeFe-Rh / CeO with core-shell struct...

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Abstract

The invention belongs to the technical field of catalyst materials, and discloses a supported catalyst with a kernel-shell structure, a preparation method thereof and an application. The preparation method of the catalyst includes: co-precipitating alcoholic solution of base metal soluble salt and carrier metal soluble salt under the function of precipitator; and then sintering and restoring sediment, and obtaining the precursor of the supported base metal; and then performing replacement reaction and sintering reaction twice on the supported base metal precursor and precious metal homogeneous solution, and obtaining the supported catalyst taking mesoporous metal oxide as a carrier, base metal as kernel, and alloy of the base metal and precious metal as a shell. The catalyst forms the supported kernel-shell structure, the shell is an alloy of the thin base metal and the precious metal; thus the dosage of the precious metal can be obviously reduced, the production cost of catalyst is decreased; during the catalyzing, decomposing and hydrogen-making processes of hydrazine hydrate, the supported catalyst has good catalyzing efficiency and hydrogen-making selectivity.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a supported catalyst with a core-shell structure and a preparation method and application thereof. Background technique [0002] Hydrazine hydrate (N 2 h 4 ·H 2 O) Hydrogen production by catalytic decomposition is a new integrated hydrogen storage / production technology with promising vehicle / mobile hydrogen source application prospects. Compared with traditional chemical hydrogen storage (such as sodium borohydride, ammonia borane and formic acid) technology The advantages are: high effective hydrogen storage capacity (8wt%), no solid by-products, low cost of hydrogen production, safe and convenient material storage and transportation. The effective hydrogen storage component of hydrazine hydrate is hydrazine (N 2 h 4 ), its decomposition can be carried out according to two competing paths: N 2 h 4 →N 2 +2H 2 , 3N 2 h 4 →4NH 3 +N 2 . From the...

Claims

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Application Information

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IPC IPC(8): B01J23/89C01B3/04
CPCB01J23/745B01J23/75B01J23/755B01J23/89B01J37/00C01B3/04Y02E60/36
Inventor 王平戴洪斌钟玉洁
Owner SOUTH CHINA UNIV OF TECH
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