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Metallic nanoparticle catalysts embedded in porous oxide support, which show high catalytic activity even at low temperatures

A nanoparticle and metallic technology, which is applied in the field of metallic nanoparticle catalysts, can solve the problems of inability to guarantee catalyst stability, unfavorable catalyst stability, and inability to use catalysts for industrial purposes, so as to improve catalyst performance, improve fluidity decline, Reduces the effect of resistance through flow

Active Publication Date: 2021-11-05
QUANTUM CAT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the melting point of gold (1064°C) is relatively lower than that of platinum (1768°C), rhodium (1964°C), palladium (1555°C), etc. From a relatively low temperature, the fluidity of the particle surface increases, and nanoparticles are easy to mix with Neighboring particles are sintered, which is not conducive to ensuring stability as a catalyst in high-temperature reaction environments
For example, in terms of gold, its Tamman temperature (Tamman temperature), which is the temperature at which the fluidity of the metal surface increases sharply, is about 396° C., and the temperature of ordinary automobile exhaust gas is about 400 to 600° C. When the structure of gold nanoparticles is stable, it cannot be used as a catalyst for automobile exhaust gas purification and other industrial applications that require high-temperature environments
Most of the currently developed gold nanocatalysts have a structure in which gold nanoparticles are exposed and attached to the surface of a support made of oxides, and the stability of the catalyst cannot be guaranteed at high temperatures.

Method used

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  • Metallic nanoparticle catalysts embedded in porous oxide support, which show high catalytic activity even at low temperatures
  • Metallic nanoparticle catalysts embedded in porous oxide support, which show high catalytic activity even at low temperatures
  • Metallic nanoparticle catalysts embedded in porous oxide support, which show high catalytic activity even at low temperatures

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preparation example Construction

[0072] The preparation method of the porous catalyst composition according to the present invention generally comprises: the step of functionalizing the metallic nanoparticles stabilized by covering the stabilizer by combining the surface of the nanoparticles with a polymer; mixing the functionalized nanoparticles on the solution; A step of synthesizing the metallic nanoparticles, an active agent and an oxide precursor, a metallic nanoparticle dispersion trapped in a porous oxide carrier; and a step of firing the metallic nanoparticle dispersion at 400-500°C . Wherein, the metal of the above-mentioned metallic nanoparticles can be at least one selected from the group consisting of metals and metal oxides such as gold, silver, nickel, copper, palladium, platinum, rhodium, etc., and the above-mentioned metallic nanoparticles can be It can be prepared by the method described in this specification, and can be prepared using a commercially available substance or a method known to t...

Embodiment 1

[0086]

[0087] In order to use an example to specifically illustrate the method for preparing the porous catalyst composition of metallic nanoparticles according to the present invention, below, as metallic nanoparticles, gold nanoparticles are exemplarily selected as objects to illustrate the porosity of gold nanoparticles Process for the preparation of catalyst compositions. In this example, detailed steps are illustratively described in terms of conditions for forming a catalyst containing 4 nm gold nanoparticles.

[0088] [Step 1]: Functionalization of metallic nanoparticles into polymers

[0089] [Step 1-1]: Oleylamine-covered and stabilized gold nanoparticles were synthesized according to the following procedure.

[0090] First, oleylamine is selected as a stabilizer, and at room temperature, 60ml of tetralin, 60ml of oleylamine, 0.6g of HAuCl·H 2 The O solution was prepared by stirring for 10 min. 6 mmol of TBAB (tetrabutylammonium bromide), 6 ml of tetralin, and ...

Embodiment 2

[0099]

[0100] Prepare 0.15 g of PEG-functionalized gold nanoparticles (4-Au-PEG) and 0.675 g of Pluronic F127 prepared in the same manner as in [1-2 steps] of Example 1 above, and uniformly disperse them in nitric acid (68%) 0.8 mL and 40 mL of ethanol, 0.81 g of aluminum ethoxide was added to the dispersion. Then, the dispersion of the above mixture was stirred for 3 hours, maintained at room temperature for 24 hours without stirring, and then dried at 60° C. for 3 hours to prepare a red solid. Next, the red solid was washed with water, dried, and then calcined at a temperature of 400° C. to remove PEG and Plronic F127 macromolecules, thereby preparing a gold nanoparticle catalyst contained in porous alumina.

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Abstract

The present invention relates to a metallic nanoparticle catalyst and, more specifically, to a porous catalyst having metallic nanoparticles embedded in a porous oxide support and to a method for preparing the porous catalyst. To this end, a porous catalyst composition having metallic nanoparticles of the present invention comprises: an oxide matrix structure having mesopores and micropores; and metal or metal oxide nanoparticles embedded in the oxide matrix structure having mesopores and micropores. A method for preparing a porous catalyst composition having metallic nanoparticles of the present invention comprises the steps of covering metallic nanoparticles containing at least any one of metals and metal oxides with a stabilizer to stabilize the metallic nanoparticles and then binding a polymer to the surface of the metallic nanoparticles to functionalize the metallic nanoparticles; mixing an oxide precursor in a solution in which the functionalized metal nanoparticles and an activator are mixed and dispersed, thereby synthesizing a metallic nanoparticle dispersion embedded in a porous oxide support; and firing the metallic nanoparticle dispersion. Thus, metallic nanoparticle catalysts having high activity even at low temperatures are realized.

Description

technical field [0001] The present invention relates to a metallic nanoparticle catalyst, and more specifically, to a porous catalyst in which metallic nanoparticles are trapped on a porous oxide carrier and a method for preparing the porous catalyst. Background technique [0002] Heterogeneous catalysts are essential factors that control more than 90% of the world's chemical processes. Catalyst substances mainly composed of metals do not directly participate in the reaction, but lower the activation energy by interacting with the reaction substance on the surface, thereby reducing energy costs. Improve process economy. In the past few decades, nanotechnology has developed rapidly, and catalyst technology has also become more detailed and deepened. When catalyst substances are prepared from nanometer-sized particles, the surface area that causes the reaction increases dramatically, and very high efficiency can also be achieved by a small amount of catalyst substances. catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/00B01J35/10B01J35/02B01J23/52B01J37/04B01J37/08B01J37/00B01D53/62B01D53/72
CPCB01J23/52B01D53/864B01D2257/502B01D2257/108B01D2257/7025B01D2257/7027B01D2255/9205B01D2255/9202B01D2255/20707B01D2255/2065B01D2255/20746B01D2255/20776B01D2255/2047B01D2255/20715B01D2255/20738B01D2255/2073B01D2255/2045B01D2255/2027Y02C20/20B01J35/393B01J35/30B01J35/23B01J37/04B01J37/08B01J37/0009B01D53/62B01D53/72B01J35/19B01J35/40B01J35/64B01J35/66B01D2255/106B01D53/944B01J21/04B01J21/063B01J21/08B01J37/0018B01J37/082
Inventor 姜信贤
Owner QUANTUM CAT CO LTD