Supported bimetallic catalyst for CO catalytic oxidation through visible light at room temperature

A bimetallic catalyst, catalytic oxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as low utilization efficiency of visible light, and achieve good light Catalytic performance, broadening the application range, reducing the effect of temperature

Active Publication Date: 2013-02-20
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims at the disadvantage of low visible light utilization efficiency of a single precious metal-supported catalyst, introduces Ag nanoparticles into the Au-supported catalyst, prepares a supported Au-Ag bimetallic catalyst, and catalyzes a reaction system for oxidation of CO at room temperature Introducing visible light into

Method used

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  • Supported bimetallic catalyst for CO catalytic oxidation through visible light at room temperature
  • Supported bimetallic catalyst for CO catalytic oxidation through visible light at room temperature
  • Supported bimetallic catalyst for CO catalytic oxidation through visible light at room temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Au-Ag / TiO 2 Catalyst preparation

[0020] Weigh 1.0 g TiO 2 (particle size of 60-80 mesh) was placed in a beaker, and 0.5 mL of AgNO with a concentration of 0.01 mol / L was added 3 Solution, 1~5h, 60~80°C drying, the drying material with a concentration of 0.01mol / L NaBH 4 Solution (ice-water bath) reduction, deionized water washing, vacuum drying at 30~50°C after removing excess ions, to obtain Ag-containing intermediates, namely Ag / TiO 2 . Prepared Ag / TiO 2 The intermediate was placed in 0.5mL with a concentration of 0.01 mol / L HAuCl 4 solution, at the same time use 0.1mol / L NaOH solution to adjust the pH of the suspension to about 9~11, soak for 2~6h, and dry at 60~80℃; 4 Solution (ice-water bath) reduction, deionized water washing to remove excess ions to obtain a supported bimetallic catalyst containing Ag and Au, namely: Au-Ag / TiO 2 . The contents of Au and Ag in the catalyst are about 0.1 wt % and 0.05 wt %, respectively, and the molar ratio is 1:1.

[00...

Embodiment 2

[0026] Catalyst Performance Evaluation

[0027] The performance evaluation of the catalytic oxidation of CO by the catalyst prepared in Example 1 was carried out in a self-designed fixed-bed miniature continuous flow device at normal temperature and pressure with a circulating condensing system. The catalyst is packed in a square reaction tube (20*20*1mm 3 ), the catalyst dosage is 400 mg, the catalyst particle size is 0.2-0.3 mm (60-80 mesh), and the O in the reaction gas 2The contents of CO and CO are fixed at 0.3v%, He gas is used as the balance supplementary gas, and the reaction gas flow rate is about 100 mL / min. The reaction temperature is regulated by a circulating condensation system, which is about 20.5°C. Agilent 4890D gas chromatograph was used to regularly analyze CO and O in the atmosphere 2 and CO 2 concentration, TCD is the detector, TDX-01 is packed into the column, and the CO conversion rate is calculated by taking the result of the reaction for 2 hours. ...

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Abstract

The invention discloses a supported bimetallic catalyst for CO catalytic oxidation through visible light at the room temperature and a preparation method and applications thereof. Au and Ag nanometer particles absorbing visible light are used as active components to be supported on TiO2 carriers to prepare the supported bimetallic catalyst. The supported bimetallic catalyst is prepared through two steps: preparing intermediates containing Ag, and preparing the supported bimetallic catalyst containing Au and Ag. Afterwards, visible light is led in a reaction system to improve photo-catalysis performances of the catalyst for CO catalytic oxidation. The catalyst can be used for removing CO at the room temperature. Compared with a single supported Au catalyst, the promotion effect of visible light on CO catalytic oxidation by the Au and Ag bimetallic catalyst is improved apparently (that is, the utilization efficiency of the visible light is improved), and the catalyst preparation method is simple and easy to implement, low in cost and is good for being popularized and used.

Description

technical field [0001] The invention belongs to the field of catalytic oxidation removal of CO, and more specifically relates to a supported bimetallic catalyst for catalytic oxidation of CO under visible light at room temperature, a preparation method and application thereof. Background technique [0002] Catalytic oxidation of CO at room temperature eliminates trace amounts of CO in a closed system, CO 2 Lasers and gas sensors have strong practical value. Supported noble metal catalysts such as Au, Pt, and Pd have attracted much attention due to their low-temperature catalytic oxidation of CO, but such catalysts are prone to deactivation, resulting in a short service life. In order to improve the lifetime of such catalysts, the inventors have passed the Au / TiO 2 Visible light is introduced into the catalyst, and the plasmon resonance effect (Surface Plasmon Resonance, SPR) of Au nanoparticles is used to improve the activity and stability of its catalytic oxidation of CO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01D53/86B01D53/62
CPCY02A50/20
Inventor 戴文新司瑞茹陈旬刘平郑华荣王绪绪李朝晖付贤智
Owner FUZHOU UNIV
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