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Carbon monoxide oxidation catalyst and preparation method thereof

A technology for oxidation catalysts and carbon monoxide, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of catalyst deactivation, limited use, easy absorption of water, etc., and achieve high catalytic activity and high Water resistance, preparation method and effect of simple process

Inactive Publication Date: 2011-06-22
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A Hopcalite catalyst for low-temperature oxidation of CO, a CuO-MnO x The composite oxide as the main component, the catalyst also has problems such as easy absorption of water during storage and use, leading to catalyst deactivation, which limits its use in many fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 5g natural attapulgite clay as carrier, put 1.7322g Cu(NO 3 ) 2 ·3H 2 O, 0.6116g CuCl 2 2H 2 O, 4.8ml PdCl 2 (Pd ion concentration 9.5mg / mL) was made into a solution, impregnated on the attapulgite clay carrier, dried at 80°C for 3 hours, and dried at 120°C for 3 hours to prepare the attapulgite clay-supported palladium-copper catalyst, which was pressed into tablets and sieved Particles with a particle size of 40-60 meshes are used, the loading amount of Cu is 12wt%, and the loading amount of Pd is 0.2wt%.

[0016] Preprocessing and evaluation: pass N 2 Raise the temperature to 400°C to treat the catalyst for 1 hour, and still pass N during the cooling process. 2 Protect until it drops to 25°C, and then switch to the air saturated with water vapor for 3h. The raw gas composition is CO: 0.5%, O 2 : 14.4%, N 2 : 85.1% (volume percentage), and saturated with water vapor, the gas volume space velocity is 6000h -1 , when the reaction temperature is 25 DEG C, ...

Embodiment 2

[0018] The catalyst described in Example 1 was used.

[0019] Preprocessing and evaluation: pass N 2 Raise the temperature to 400°C to treat the catalyst for 1 hour, and still pass N during the cooling process. 2 Protect until it drops to 25°C. The raw gas composition is CO: 0.5%, O 2 : 14.4%, N 2 : 85.1% (volume percentage), and saturated with water vapor, the gas volume space velocity is 6000h -1 , when the reaction temperature is 25 DEG C, after 80 minutes of reaction, the conversion rate of carbon monoxide reaches 100%, and the catalytic activity lasts for at least 180 minutes.

Embodiment 3

[0021] The catalyst described in Example 1 was used.

[0022] Preprocessing and evaluation: pass N 2 Raise the temperature to 400°C to treat the catalyst for 1 hour, and still pass N during the cooling process. 2 Protect until it drops to 25°C, and treat it with water vapor-saturated air at room temperature for 3 hours. The raw gas composition is CO: 0.5%, O 2 : 14.4%, N 2 : 85.1% (volume percentage), and saturated with water vapor, the gas volume space velocity is 10000h -1 , when the reaction temperature is 25 DEG C, after 30 minutes of reaction, the conversion rate of carbon monoxide reaches 85%, and the catalytic activity lasts for at least 120 minutes.

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PUM

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Abstract

The invention provides a carbon monoxide oxidation catalyst and a preparation method thereof. A carrier of the catalyst is attapulgite clay, active components of the catalyst are Cu and Pd, the loading capacity of the Cu is 8-12 wt percent, and the loading capacity of the Pd is 0.2-1 wt percent. The preparation method comprises the steps of: preparing Cu(NO3)2.3H2O, CuCl2.2H2O and PdCl2 in a mol ratio of (2-4):(1-2):(1.5-3) into a solution; and dipping equivalent or excessive solution to the carrier of the attapulgite clay, drying and tabletting to obtain the catalyst. The catalyst has higher catalysis activity, stability and water resistance, and can be used for carrying out effective catalytic oxidation on steam saturated CO under the reaction conditions of normal temperature, space velocity of 2500-10000h<-1> and CO content of 2000-10000ppm, wherein the activity duration of the catalyst is not lower than 120min.

Description

technical field [0001] The invention relates to a carbon monoxide oxidation catalyst, in particular to a carbon monoxide oxidation catalyst of natural attapulgite clay supported palladium copper and a preparation method thereof. The catalyst is suitable for use under normal temperature and normal humidity conditions. Background technique [0002] The catalytic oxidation process of CO at room temperature involves the elimination of environmental pollution, air purification, CO 2 Gas purification in lasers, CO sensors, gas masks, and CO removal in closed systems. However, at room temperature, especially in the presence of water vapor, many catalysts have disadvantages such as low activity and poor water resistance, which limit their use. Therefore, CO oxidation catalysts with high activity and high stability under normal temperature and humidity conditions have become a research hotspot. [0003] There are two main types of CO catalytic oxidation catalysts: supported noble m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/02C01B31/20C01B32/50
Inventor 王永钊赵永祥张卓李凤梅高晓庆
Owner SHANXI UNIV
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