Preparation method of magnetic precious metal heterogeneous catalyst

A technology of heterogeneous catalyst and precious metal catalyst is applied in the field of preparation of magnetic precious metal heterogeneous catalyst, which can solve the problems of complicated centrifugal and filtration recovery methods, limited separation efficiency, complicated operation and the like, and achieves low cost, low equipment requirements, Choose from a wide range of effects

Inactive Publication Date: 2014-09-24
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods can effectively separate the catalyst from most of the reaction system. However, centrifugation and filtration of a large amount of reaction solution in industrial production takes a long time and involves more complicated operations.
At the same time, for systems that require special operating conditions, such as systems involving toxic compounds, volatile, flammable, and explosive materials, and systems that require air isolation, etc., centrifugation and filtration recovery methods will become more complicated
Furthermore, the separation efficiency of the two methods for the system with tiny catalyst particles is relatively limited.

Method used

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  • Preparation method of magnetic precious metal heterogeneous catalyst
  • Preparation method of magnetic precious metal heterogeneous catalyst
  • Preparation method of magnetic precious metal heterogeneous catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation method of magnetic carrier

[0030] At room temperature, add 1.0 g activated carbon, 0.5 g FeSO 4 ·7H 2 O, 0.25g NiSO 4 ·6H 2 O, 250mL deionized water, mechanically stirred at a rate of 220r / min to dissolve it, and N 2 Exhaust the air in the system, and then add 10 mL of dissolved 0.12 g NaBH dropwise while stirring 4 deionized aqueous solution. After reacting for 30 minutes, the black suspension was separated magnetically, the solution was poured off, the solution was washed with deionized water, and the above product was vacuum-dried for 2 hours to obtain a magnetic carbon carrier. figure 1 SEM photographs of magnetic carbon carriers.

[0031] The corresponding carbon carrier can be obtained by replacing the activated carbon with alumina, kaolin, diatomaceous earth, etc.

Embodiment 2

[0033] Preparation method of magnetic palladium carbon (5% palladium content)

[0034] Add 0.2g of activated carbon and 0.1g of FeSO to a 250mL three-neck flask 4 ·7H 2 O, 0.05g NiSO 4 ·6H 2 O, 20mL of methanol and 30mL of deoxygenated water, mechanically stirred at a rate of 220r / min to dissolve, while passing through N 2 Exhaust the air in the system, and add 10mL of dissolved 0.04g NaBH dropwise while stirring 4 deoxygenated aqueous solution. Obtain black suspension, increase N 2 flow, let stand for 1 hour. Afterwards, increase the speed to 500r / min, and add 0.03g Na dissolved in it dropwise while stirring. 2 PdCl 4After the dropwise addition, the reaction was continued for 30 minutes to stop. The product was subjected to magnetic separation, washed with deoxygenated water and ethanol, and vacuum-dried for 2 h to obtain a magnetic palladium-carbon catalyst.

[0035] figure 2 It is a SEM photo of the magnetic palladium-carbon catalyst. It can be seen from the fig...

Embodiment 3

[0037] Preparation method of magnetic platinum carbon

[0038] Adopt the processing method of example 2, Na 2 PdCl 4 Replaced with Na 2 PtCl 4 Magnetic platinum-carbon catalysts can be prepared.

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Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a preparation method of a magnetic precious metal heterogeneous catalyst. The preparation method comprises the following steps: firstly, introducing iron, cobalt and nickel into a carrier, endowing the carrier with magnetic properties, and further loading precious metals of platinum, palladium, ruthenium, gold, silver, iridium or osmium in the magnetic carrier through a reducing reaction to prepare the magnetic precious metal heterogeneous catalyst. The magnetic precious metal heterogeneous catalyst prepared by adopting the preparation method has excellent catalysis activity, and can be rapidly recycled through magnetic separation. In addition, the magnetic property of the magnetic precious metal heterogeneous catalyst is easily adjusted, and the magnetic separation time can be adjusted and controlled; catalyst structures such as specific surface area and duct structure are adjustable; precious particles are uniformly distributed, and loading amount and particles are controllable in sizes. The preparation method provided by the invention has the advantages of simplicity in operation, low cost, and the like, and can be produced in large scale. The prepared magnetic precious metal heterogeneous catalyst can be applied to recycling of conventional and special reaction system catalysts.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method of a magnetic noble metal heterogeneous catalyst. Background technique [0002] Catalysts play an extremely important role in the modern chemical industry, and almost half of the chemical products use catalysts in the production process. As the most important catalyst material, noble metal catalysts have won more and more attention and applications due to their excellent activity, selectivity and stability. At present, they have been widely used in hydrogenation, dehydrogenation, oxidation, reduction, isomerization, Aromatization, cracking, synthesis and other reactions play a very important role in chemical industry, petroleum refining, petrochemical, pharmaceutical, environmental protection and other fields, as well as new energy, sensing and other fields. According to the type of catalytic reaction, noble metal catalysts can be di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89
Inventor 郭艳辉王临才马晓华
Owner FUDAN UNIV
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