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CO low temperature oxidation catalyst and its preparation process

A technology of oxidation catalyst and carbon monoxide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc. It can solve the problems of large environmental pollution and achieve high catalytic activity and low cost. The effect of low and high stability

Inactive Publication Date: 2008-01-23
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the catalyst requires a higher concentration of acid, resulting in greater environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The catalyst was prepared by liquid phase precipitation method, and 17.4632g Co(NO 3 ) 2 ·6H 2 Dissolve O in 30ml of distilled water, add 4.0mol / L ammonium bicarbonate solution drop by drop under strong stirring until pH = 7.5, after the dropwise addition, raise the temperature to 30°C, react for 3 hours, filter and wash repeatedly with distilled water , dried in an oven at 80-120°C, and then placed in a muffle furnace and baked at 300°C for 3 hours in a flowing air atmosphere to obtain Co 3 o 4 Catalyst, the catalyst is a uniform black color. After tableting and sieving, the particles with a particle size of 40-60 mesh are taken.

[0021] The raw gas composition is CO: 0.5%, O 2 : 14.4%, N 2 : 85.1% (volume percentage), gas volume space velocity is 5000h -1 , when the reaction temperature is 25°C, the catalyst can keep catalytic CO completely converted to CO 2 360min.

Embodiment 2

[0023] The catalyst was prepared by liquid phase precipitation method, and 17.4632g Co(NO 3 ) 2 ·6H 2 Dissolve O in 30ml of distilled water, add 7.4mol / L ammonia water drop by drop under strong stirring until pH = 9.0, react at 25°C for 5 hours after the addition, then filter and wash repeatedly with distilled water, place in an oven for 80 Dry at -120°C, then place in a muffle furnace and bake at 300°C for 3 hours in a flowing air atmosphere to obtain Co 3 o 4 catalyst. The catalyst was uniformly black in color. After tableting and sieving, the particles with a particle size of 40-60 mesh are taken.

[0024] When using the raw material gas described in Example 1, the gas volume space velocity and the reaction temperature, the catalyst can keep catalytic CO fully converted into CO 2 120min.

Embodiment 3

[0026] Catalyst was prepared by liquid phase precipitation method, 14.9358g Co(CH3 COO) 2 4H 2 Dissolve O in 30ml of distilled water, add 4.0mol / L ammonium bicarbonate solution drop by drop at room temperature to pH = 6.5, or add dropwise in reverse order, after the dropwise addition, raise the temperature to 50°C, react for 2 hours, and filter And washed repeatedly with distilled water, dried in an oven at 80-120 °C, and then placed in a muffle furnace and roasted at 300 °C for 3 hours in a flowing air atmosphere to obtain Co 3 o 4 catalyst. Uniform black color in catalyst. After tableting and sieving, the particles with a particle size of 40-60 mesh are taken.

[0027] When using the raw material gas described in Example 1, the gas volume space velocity and the reaction temperature, the catalyst can keep catalytic CO fully converted into CO 2 150min.

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Abstract

The low-temperature oxidation catalyst with Co3O4 as constituent for carbon monoxide is prepared by: by cobalt inorganic salt as predecessor and weak base as precipitant and liquid-phase deposition or homogeneous precipitation method, controlling pH value as 6-10, reacting for 1-5h at 25-80Deg; filtering, cleaning, drying, and calcining. The product has high catalytic activity and stability, and fit to wide applying range as -78-100Deg, air speed 2500-20000h-1, and CO content 0.25-2.0%. This method is simple and low cost.

Description

technical field [0001] The invention relates to a catalyst for catalyzing the oxidation of carbon monoxide, in particular to a low-temperature oxidation catalyst for carbon monoxide suitable for the range of -78-100°C and a preparation method thereof. Background technique [0002] The low-temperature catalytic oxidation of carbon monoxide (CO) has attracted much attention because of its important practical value in many aspects, such as filter self-rescuer and fire-fighting self-rescue respirator for underground mines, elimination of environmental pollution, reduction of tobacco damage, air purifiers, closed Formula CO 2 Lasers, fuel cells, CO gas sensors, and CO elimination in closed systems. [0003] At present, there are three main types of catalysts used for CO catalytic oxidation: noble metal type, perovskite type oxide and non-noble metal oxide type. [0004] Supported noble metal (Pt, Pd, etc.) catalysts are widely used in the catalytic oxidation of CO. Pt / SnO as d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J37/03B01D53/62B01D53/86
CPCY02A50/20
Inventor 赵永祥王永钊高春光刘滇生
Owner SHANXI UNIV
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