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CO low-temperature catalytic oxidation catalyst, and preparation method and application thereof

An oxidation catalyst, low temperature catalysis technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as fuel cell performance degradation and achieve good stability , the preparation method is simple, and the effect of improving the catalytic oxidation performance

Active Publication Date: 2014-11-05
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a small amount of CO will poison the Pt electrode in the fuel cell and significantly reduce the performance of the fuel cell. Therefore, it is necessary to reduce the CO concentration to less than 10ppm in the hydrogen-rich system. Selecting a suitable catalyst is the key to this technology.

Method used

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  • CO low-temperature catalytic oxidation catalyst, and preparation method and application thereof
  • CO low-temperature catalytic oxidation catalyst, and preparation method and application thereof
  • CO low-temperature catalytic oxidation catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 0.26g of ferric nitrate to 60mL of TEG to form a mixed solution, then heat the mixed solution to 250°C under the protection of an inert gas, and cool naturally to obtain a solution containing Fe. 3 o 4 TEG solution of nanoparticles; 3 o 4 Add 0.026g chloroplatinic acid to the TEG solution of nanoparticles, stir for 2h, pass H 2 Reduction for 1h to obtain Pt-Fe 3 o 4 The solution of combination type nanoparticle; The Pt-Fe 3 o 4 A solution of combined nanoparticles with 1 g TiO 2 Mixing, magnetic stirring makes Pt-Fe 3 o 4 Combined nanoparticles are completely adsorbed on TiO 2 surface, filtered, washed, dried, and calcined at 250°C for 2 hours to obtain Pt-Fe 3 o 4 / TiO 2 The catalyst is the CO low-temperature catalytic oxidation catalyst.

Embodiment 2

[0030] Add 0.26g of ferric nitrate to 60mL of TEG to form a mixed solution, then heat the mixed solution to 250°C under the protection of an inert gas, and cool naturally to obtain a solution containing Fe. 3 o 4 TEG solution of nanoparticles; 3 o 4 Add 0.052 g of chloroplatinic acid to the TEG solution of nanoparticles, stir for 2 h, pass through H 2 Reduction for 1h to obtain Pt-Fe 3 o 4 The solution of combination type nanoparticle; The Pt-Fe 3 o 4 A solution of combined nanoparticles with 1 g TiO 2 Mixing, magnetic stirring makes Pt-Fe 3 o 4 Combined nanoparticles are completely adsorbed on TiO 2 surface, filtered, washed, dried, and calcined at 250°C for 2 hours to obtain Pt-Fe 3 o 4 / TiO 2 The catalyst is the CO low-temperature catalytic oxidation catalyst.

Embodiment 3

[0035] Take by weighing the Pt-Fe that 0.1g embodiment 2 makes 3 o 4 / TiO 2 The catalyst is placed in a U-shaped quartz tube reactor with an inner diameter of 8 mm, and the gas flow rate is adjusted so that CO:O 2 :N 2 =1:40:160 (volume ratio), wherein the volume concentration of CO is 5000ppm, the reaction space velocity (GHSV) is 60000mL / (g h), the reaction temperature is 25°C, and the CO concentration and products are determined by a CO detector.

[0036] The reaction results showed that the conversion of CO was 100% after passing through the catalyst system at 25 °C.

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Abstract

The invention discloses a CO low-temperature catalytic oxidation catalyst, and a preparation method and an application thereof. The catalyst is composed of a carrier TiO2 and an active component Pt-Fe3O4 composite type nano-particles. In the catalyst, a Pt load is 0.1-5wt%, and a Fe3O4 load is 2-20wt%. The Pt-Fe3O4 composite type nano-particles are obtained with the following method: under room temperature, chloroplatinic acid is added to a TEG solution of Fe3O4; the mixture is stirred, and H2 is delivered for reduction, such that the Pt-Fe3O4 composite type nano-particles are obtained. The preparation method of the catalyst provided by the invention is simple, and is suitable for expanded-scale industrialized production. With the addition of the magnetic Fe3O4 nano-particles, catalytic oxidation performance of the catalyst upon CO is greatly improved, and low-temperature CO complete oxidation can be realized. The catalyst has good stability.

Description

(1) Technical field [0001] The invention belongs to the technical field of catalysts, in particular to a Pt-Fe 3 o 4 / TiO 2 Catalyst and its preparation method, and its application in low-temperature catalytic oxidation of CO, magnetic Fe 3 o 4 The addition of nanoparticles greatly enhanced the catalytic oxidation activity of the catalyst for CO. (2) Background technology [0002] Industrial production and automobile exhaust produce a large amount of volatile gases, especially automobile exhaust. According to the statistics of relevant departments, 60% to 70% of air pollutants in the air come from automobile exhaust, and the exhaust gas contains a large amount of CO. CO is a colorless, odorless, water-insoluble gas. After entering the human body, it will combine with the hemoglobin in the blood of the human body, and then exclude the combination of hemoglobin and oxygen, resulting in hypoxia and human poisoning. On the other hand, CO Its physical and chemical properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/62
CPCY02A50/20
Inventor 严新焕李加衡
Owner ZHEJIANG UNIV OF TECH
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