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Preparation method of ceria-loaded highly dispersed nano-catalyst

A nano-catalyst, ceria technology, applied in the field of preparation of ceria-loaded highly dispersed nano-catalysts, can solve problems such as disappearance and oxidation

Inactive Publication Date: 2017-06-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in theory, increasing CeO 2 The concentration of surface oxygen vacancies in the support can promote the dispersion of metal ions, but CeO 2 Oxygen vacancies on the surface are easily oxidized and disappear by absorbing oxygen in the air

Method used

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  • Preparation method of ceria-loaded highly dispersed nano-catalyst

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preparation example Construction

[0030] The invention provides a method for preparing a ceria-loaded highly dispersed nano-catalyst, comprising the following steps: S1) heating ceria and a reducing gas to react, and then cooling to room temperature in an inert gas to obtain reduced ceria Cerium; S2) Under an oxygen-free condition, the metal salt precursor solution is mixed with the reduced ceria, left to stand, dried and then calcined to obtain a ceria-supported highly dispersed nano-catalyst.

[0031] The present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0032] According to the present invention, it is preferred to first heat cerium oxide to the reaction temperature under the condition of feeding an inert gas, and then feed a reducing gas to react; the inert gas is an inert gas well known to those skilled in the art, and No special limitation, preferably one or more of argon, helium and nitrogen in the present invention; the flow rate of t...

Embodiment 1

[0041] Example 1: Preparation of reduced ceria nanoparticles

[0042] All experiments were carried out in a glove box filled with argon atmosphere (oxygen content below 0.1 ppm). Take 0.5g of fresh ceria powder sample, heat up to 300°C at 10°C / min in an argon atmosphere, the gas flow rate is 30mL / min, then switch to hydrogen at the same flow rate, and after 1h, cool down to room temperature in an argon atmosphere , that is, ceria nanoparticles reduced at 300°C were obtained.

[0043] figure 1 It is the photo of the fresh ceria powder sample sheet in embodiment 1.

[0044] figure 2 It is a photograph of the ceria nanoparticles reduced at 300°C obtained in Example 1.

Embodiment 2

[0045] Example 2: Preparation of reduced ceria nanoparticles

[0046] All experiments were carried out in a glove box filled with argon atmosphere (oxygen content below 0.1 ppm). Take 0.5g of fresh ceria powder sample, heat up to 400°C at 10°C / min in an argon atmosphere, the gas flow rate is 30mL / min, then switch to hydrogen at the same flow rate, and after 1h, cool down to room temperature in an argon atmosphere , that is, ceria nanoparticles reduced at 400 °C were obtained.

[0047] image 3 It is a photograph of the ceria nanoparticles reduced at 400°C obtained in Example 2.

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Abstract

The invention provides a preparation method of a ceria-loaded highly dispersed nano-catalyst. The preparation method comprises S1) heating cerium oxide and reducing gas for a reaction, and then cooling the reaction product to the room temperature in inert gas to obtain reduced ceria, and S2) mixing a metal salt precursor solution and the reduced ceria under anaerobic conditions, standing the mixture, drying the mixture and carrying out calcining to obtain the ceria-loaded highly dispersed nano-catalyst. Compared with the prior art, the preparation method uses the reducing gas to reduce the ceria so that the surface oxygen vacancy is produced and is protected in an oxygen-free environment, and then prepare the ceria-loaded highly dispersed nano-catalyst under strong interaction of metal ions and oxygen vacancy. Through controlling the degree of reduction of the carrier ceria, the ceria-loaded highly dispersed nano-catalyst is obtained and catalytic performances are improved. The preparation method has the advantages of simple processes, good repeatability, low cost and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a method for preparing a ceria-loaded highly dispersed nanometer catalyst. Background technique [0002] Ceria (CeO 2 ) has excellent oxygen storage and release properties and is widely used in oxidation reactions, such as Pd / CeO 2 Catalysts are widely used in the catalytic purification technology of motor vehicle exhaust, for the combustion reaction of low-carbon hydrocarbons, that is, DOC catalysts; another example is Cu / CeO 2 Catalysts are often used as CO-PROX catalysts to catalyze the oxidation of trace amounts of carbon monoxide under hydrogen-rich conditions in proton exchange membrane fuel cells. [0003] It is well known that increasing the dispersion of active-site metals in supported nanocatalysts is conducive to improving catalytic activity, and at the same time can reduce the amount of noble metal catalysts and reduce costs. At present, there are mainly the foll...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J23/63B01J23/83
CPCB01J23/10B01J23/63B01J23/83
Inventor 黄伟新尤瑞曹天李兆锐
Owner UNIV OF SCI & TECH OF CHINA
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