A kind of supported catalyst with core-shell structure and its preparation method 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

Inactive Publication Date: 2017-04-05
SOUTH CHINA UNIV OF TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the alloy catalysts with better catalytic activity usually have high noble metal content, which leads to high preparation costs of the catalysts, which limits the practical application of hydrazine hydrate catalytic decomposition of hydrogen production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of supported catalyst with core-shell structure and its preparation method and application
  • A kind of supported catalyst with core-shell structure and its preparation method and application
  • A kind of supported catalyst with core-shell structure and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A supported catalyst Ni@Ni–Pt / La with a core-shell structure in this example 2 o 3 , its preparation method is as follows:

[0051] (1) Co-precipitation method to prepare supported non-noble metal precursor Ni / La 2 o 3 :

[0052] 20mL 2.1M TMAH ethanol solution was added dropwise to 60mL 0.083M Ni(NO 3 ) 2 and 0.17M La(NO 3 ) 3 In the ethanol solution, react for 1h, transfer to the reaction kettle lined with tetrafluoroethylene, react for 12h at 100°C under sealed conditions, and obtain precipitates by centrifugation, dry the precipitates at 60°C for 12h, and then transfer the precipitates into the tube Sintered in an air atmosphere at a temperature of 500 °C for 2 h, and finally in flowing H 2 Atmosphere and 500°C temperature reduction for 1.5h, the supported non-noble metal precursor Ni / La can be obtained 2 o 3 ;

[0053] (2) Preparation of supported catalyst Ni@Ni–Pt / La with core-shell structure by displacement method 2 o 3 :

[0054] Under room tempera...

Embodiment 2

[0071] A supported catalyst Ni@Ni–Pt / La with a core-shell structure in this example 2 o 3 , its preparation method is as follows:

[0072] (1) Co-precipitation method to prepare supported non-noble metal precursor Ni / La 2 o 3 : same as embodiment 1;

[0073] (2) Preparation of supported catalyst Ni@Ni–Pt / La with core-shell structure by secondary replacement method 2 o 3 :

[0074] Under room temperature and magnetic stirring, the supported non-noble metal precursor Ni / La in step (1) 2 o 3 Place in 20mLK 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) to carry out the first displacement reaction, react for 1h, centrifuge and precipitate, and the precipitate is washed with water and alcohol in turn, and dynamic vacuum dried at 30°C for 12h , and then in the flow H 2 Sintered at 350 °C for 2 h in a tube furnace under atmosphere, and then placed ...

Embodiment 3

[0081] A supported catalyst Fe@Fe–Rh / CeO with a core-shell structure in this example 2 , its preparation method is as follows:

[0082] (1) Co-precipitation method to prepare supported non-noble metal precursor Fe / CeO 2 :

[0083] 20mL 1.6M TMAH ethanol solution was added dropwise to 60mL 0.067M Fe(NO 3 ) 3 and 0.067M Ce(NH 4 ) 2 (NO 3 ) 6 In the ethanol solution, react for 2 hours, transfer to a reaction kettle lined with tetrafluoroethylene, and react for 12 hours at 80°C under sealed conditions. The precipitate is obtained by centrifugation, and the precipitate is dried at 30°C for 12 hours, and then the precipitate is transferred to the tube Sintered in an air atmosphere at 400 °C for 4 h, and finally in flowing H 2 Atmosphere and 450°C temperature reduction for 3h, the supported non-noble metal precursor Fe / CeO can be obtained 2 ;

[0084] (2) Preparation of supported catalyst Fe@Fe–Rh / CeO with core-shell structure by displacement method 2 :

[0085] Under roo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to view more

Abstract

The present invention relates to the technical field of catalytic materials. Disclosed are a supported catalyst having a core-shell structure, a preparation method therefor, and an application thereof. The preparation method for the catalyst comprises: co-precipitating an alcoholic solution of a non-noble metal soluble salt and a supporter metal soluble salt under the action of a precipitant, sintering and reducing a precipitate so as to obtain a supported non-noble metal precursor, and then performing replacement reaction and sintering reaction on the supported non-noble metal precursor and a homogeneous solution of noble metal twice so as to obtain a supported catalyst in which a mesoporous metal oxide serves as a supporter, non-noble metal serves as a core and an alloy of the non-noble metal and the noble metal serves as a shell. The catalyst of the present invention forms a supported core-shell structure, an alloy of thin non-noble metal and noble metal serving as a shell. Thus, the usage of noble metal can be significantly reduced, the production cost of the catalyst is reduced, and in a catalytic decomposition hydrogen production process of a hydrazine hydrate, the catalyst has good catalysis efficiency and hydrogen production 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap