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Substrate surface structured with thermally stable metal alloy nanoparticles, method for preparing the same and uses thereof, in particular as catalyst

A nanoparticle and substrate surface technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, process for producing decorative surface effects, etc., can solve the problem of catalyst loss of activity and dispersion Loss, increase in average particle size, etc., to achieve the effect of expanding the application range

Inactive Publication Date: 2014-04-23
MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, thermal aging of platinum catalysts at temperatures such as in excess of 700 °C leads to a significant increase in the average particle size
The loss of dispersibility can exceed 80%, correspondingly, the catalyst will severely lose its activity

Method used

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  • Substrate surface structured with thermally stable metal alloy nanoparticles, method for preparing the same and uses thereof, in particular as catalyst
  • Substrate surface structured with thermally stable metal alloy nanoparticles, method for preparing the same and uses thereof, in particular as catalyst
  • Substrate surface structured with thermally stable metal alloy nanoparticles, method for preparing the same and uses thereof, in particular as catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Preparation of Nanostructured Samples with Au / Pt Alloy Particles

[0067] Nanostructuring of the substrate was achieved by the following general procedure developed in the inventor's research group.

[0068] The method of synthesizing alloy particles is based on the aforementioned BCML technique using at least two different metal salts in different ratios. The particle size is determined by the size of the cell and the loading of the metal salt.

[0069] In an exemplary embodiment of the method of the invention, micelles of PS(1056)-b-P2VP(495) in toluene at the desired concentration were prepared, followed by HAuCl in a ratio of 1:9-9:1 4 and H 2 PtCl 6 load. When using the first metal salt HAuCl 4 After loading the micelles, the solution was stirred for 24 h, followed by the addition of the second metal salt H 2 PtCl 6 . After addition of the second metal salt, the solution was stirred for an additional 72 h.

[0070] The micelles loaded with metal ions were ...

Embodiment 2

[0074] Characterization and Testing of Nanostructured Surfaces

[0075] The preparation of nanostructured substrate surfaces with different types of nanoparticles, as detailed in Example 1, was subjected to an artificial aging process to simulate the high operating temperatures eg in catalytic converters for automotive exhaust emissions.

[0076] The artificial aging process proceeds as follows:

[0077] In a muffle furnace, the sample was heated in air at 10°C / min to the target temperature and maintained at this temperature for 7 hours. Afterwards, the sample was allowed to cool (without applying a specific temperature gradient).

[0078] Silicon wafers are typically p-dot, conductive, and can be directly observed in a SEM with an Inlens detector without further processing (such as sputtering).

[0079] For TEM analysis, samples were prepared accordingly. Specifically, cut the sample (μm cross-section) so that electrons can transmit through the sample. EDX measurements we...

Embodiment 3

[0087] Coating microcolloids with the method of the present invention

[0088] according to Figure 6 The described protocol has coated and nanostructured microcolloidal particles.

[0089] Specifically, glass microspheres with different diameters, typically 10–100 μm, were immersed in caroic acid for 24 h, and dried after repeated rinsing with MilliQ water and sonication. To coat glass microspheres with metal nanoparticles, a column with PTFE frit was packed with microspheres. Subsequently, the column was filled with a toluene solution of a micellar polymer having a certain polymer concentration and loaded with the desired metal salt. The metal salt micellar solution is passed through the layer of glass microspheres with a slight overpressure by applying an inert gas flow, such as argon.

[0090] In a particular embodiment of nanostructuring particle surfaces with gold nanoparticles, HAuCl 4 The toluene solution of micelles loaded with PS(1056)-b-P2VP(495) polymer concent...

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PUM

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Abstract

The invention relates to a method for preparing a substrate surface structured with thermally stable metal alloy nanoparticles. The method comprises providing a micellar solution of amphiphilic molecules such as organic diblock or multiblock copolymers in a suitable solvent; loading the micelles of said micellar solution with metal ions of a first metal salt; loading the micelles of said micellar solution with metal ions of at least one second metal salt; depositing the metal ion-loaded micellar solution onto a substrate surface to form a (polymer) film comprising an ordered array of (polymer) domains; co-reducing the metal ions contained in the deposited domains of the (polymer) film by means of a plasma treatment to form an ordered array of nanoparticles consisting of an alloy of the metals used for loading the micelles on the substrate surface.The invention also provides a nanostructured substrate surface obtainable by said method as well as the use of said nanostructured substrate surface as a catalyst.

Description

Background technique [0001] In view of the serious worldwide increasing pollution of the environment by exhaust emissions from various sources, in particular vehicle exhaust, more and more stringent tailpipe emission regulations have come into force over the past few decades. In order to comply with these regulations, various catalytic converters for exhaust gas purification, especially of automobiles, and fuel cells have been developed. [0002] Since the availability of large catalytically active surfaces is a major issue for heterogeneous catalysis, in fuel cells and catalytic converters for automobile 2 o 3 Catalytically active noble metals such as Pt, Pd, Rh are provided on the formed coating. In order to achieve and maintain high performance catalysts, it is essential that the catalytically active noble metal is present in a highly dispersed form. [0003] The high temperatures generated during the driving operation of the car lead to irreversible agglomeration of the...

Claims

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Application Information

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IPC IPC(8): B01J23/38B01J23/89B01J37/00B01J37/02B01J37/08B01J37/18B01J37/34C03C17/00G03F7/00B81C1/00B82Y30/00B82Y40/00
CPCB01D53/944B01J21/08B01J23/89H01M4/8842B01D53/94B01D2255/1025B01J35/0013B01D2255/106B01J35/06B01J37/0018B01J23/464H01M4/921B82Y30/00B01J23/38B01J37/082B01J23/892B01J37/18H01M8/0662H01M8/0668H01M4/9041H01M4/8657C03C2218/32B01J37/349H01M4/8882B82Y40/00B01J23/52B01D2255/20753C03C17/10B01D2255/1021B01J37/0219Y02E60/50B01J35/1057H01M4/8803B01J35/23B01J35/58B01J35/643
Inventor J·P·施帕茨S·莱希纳
Owner MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN EV
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