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Catalyst for low-temperature CO catalytic oxidation and preparation method of catalyst

A low-temperature catalysis and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of poor stability and water resistance of catalysts, limiting direct industrialization and other problems, to achieve the effect of inhibiting the formation of surface carbonate, increasing the stability and reducing the cost.

Inactive Publication Date: 2014-06-04
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While the currently reported Co 3 o 4 Due to the relatively poor stability and water resistance of the catalyst, its direct industrialization is limited

Method used

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  • Catalyst for low-temperature CO catalytic oxidation and preparation method of catalyst
  • Catalyst for low-temperature CO catalytic oxidation and preparation method of catalyst
  • Catalyst for low-temperature CO catalytic oxidation and preparation method of catalyst

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] A catalyst for low-temperature catalytic oxidation of CO, which has a core-shell structure, and the core is Co 3 o 4 , the shell is CeO 2 -ZrO 2 , the ratio of core to shell is calculated according to the mole percentage of each metal atom contained, as follows:

[0028] Co 94%

[0029] Zr 5%

[0030] Ce 1%.

[0031] A kind of above-mentioned preparation method for the catalyst of CO low-temperature catalytic oxidation, specifically comprises the following steps:

[0032] (1) Add 125mL of 1mol / L Co(NO 3 ) 2 Solution I and 374mL of 0.5mol / L Na 2 CO 3 Solution II is co-current, and the amount of each drop of co-current is controlled to be 0.05-0.07ml dropwise added to 30mL of 0.5mol / L NaCO 3 In the beaker of solution III, control the stirring speed to 200-300r / min and the temperature at 60°C during the dropping process, and control the pH value within the range of 8.8-9.2 through online monitoring of the pH meter. After the dropping is completed, age for 1h, and...

Embodiment 2

[0037] A catalyst for low-temperature catalytic oxidation of CO, which has a core and shell structure, and the core is Co 3 O 4 , the shell is CeO 2 -ZrO 2 , the ratio of core to shell is calculated according to the mole percentage of each metal atom contained, as follows:

[0038] Co 89%

[0039] Zr 8%

[0040] Ce 3%.

[0041] Above-mentioned a kind of preparation method of the catalyst that is used for CO low-temperature catalytic oxidation, specifically comprises the steps:

[0042] (1), put 125mL of 1mol / L Co(NO 3 ) 2 Solution 1 and 374mL of 0.5mol / L Na 2 CO 3 The solution II is co-current, and the amount of each drop of the co-current is controlled to be 0.05-0.07 ml and added dropwise to 30 mL of 0.5 mol / L NaCO 3 In the beaker of solution III, control the stirring speed to be 200-300r / min and the temperature to be 60°C during the dripping process, and control the pH value within the range of 8.8-9.2 through the online monitoring of the pH meter. Suction filtra...

Embodiment 3

[0047] A catalyst for low-temperature catalytic oxidation of CO, which has a core and shell structure, and the core is Co 3 O 4 , the shell is CeO 2 -ZrO 2 , the ratio of core to shell is calculated according to the mole percentage of each metal atom contained, as follows:

[0048] Co 89%

[0049] Zr 5%

[0050] Ce 6%.

[0051] Above-mentioned a kind of preparation method of the catalyst that is used for CO low-temperature catalytic oxidation, specifically comprises the steps:

[0052] (1), put 125mL of 1mol / L Co(NO 3 ) 2 Solution 1 and 374mL of 0.5mol / L Na 2 CO 3 The solution II is co-current, and the amount of each drop of the co-current is controlled to be 0.05-0.07 ml and added dropwise to 30 mL of 0.5 mol / L NaCO 3 In the beaker of solution III, control the stirring speed to be 200-300r / min and the temperature to be 60°C during the dripping process, and control the pH value within the range of 8.8-9.2 through the online monitoring of the pH meter. Suction filtra...

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Abstract

The invention discloses a catalyst for low-temperature CO catalytic oxidation and a preparation method of the catalyst. The catalyst for the low-temperature CO catalytic oxidation is of a core-shell structure, the core is Co3O4, the shell is CeO2-ZrO2, and the core and the shell contain following metal atoms in mole percent: 84-94 percent of Co, 5-10 percent of Zr and 1-6 percent of Ce. The preparation method comprises the following steps: preparing Co3O4 catalyst particles by adopting a parallel flow co-precipitating method; and then loading CeO2-ZrO2 shell layers on the surfaces of the Co3O4 catalyst particles by adopting a sol-gel method to obtain the catalyst for the low-temperature CO catalytic oxidation. After being activated by inert gas, the prepared catalyst for the low-temperature CO catalytic oxidation is extremely high in catalytic activity and high in stability; the required temperature for complete CO oxidation is smaller than or equal to -65 DEG C.

Description

technical field [0001] The invention relates to a catalyst for low-temperature catalytic oxidation of CO, a preparation method thereof and its application in low-temperature catalytic oxidation of CO, belonging to the technical field of environmental catalysis. Background technique [0002] The low-temperature catalytic oxidation of CO has attracted much attention in the field of catalysis due to its wide application in the purification of automobile exhaust, tunnel and factory combustion exhaust gas. [0003] Since the 1970s, a lot of research work on CO low temperature oxidation reaction and catalytic system has been carried out at home and abroad. Its catalytically active components are generally noble metals (Pt, Pd and Rh). Catalyst costs have been greatly increased due to the continued increase in the price of these precious metals. [0004] Although gold catalysis has been particularly active in the low-temperature oxidation of CO in recent years, the price of gold ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J35/02B01D53/86B01D53/62B01J35/00
CPCY02A50/20
Inventor 吴贵升王卫国毛东森卢冠忠
Owner SHANGHAI INST OF TECH
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