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CO low temperature oxidation catalyst and its preparation process

An oxidation catalyst, carbon monoxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve problems such as large environmental pollution, achieve high catalytic activity, cost Low and high stability effects

Inactive Publication Date: 2006-04-26
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(CH 3COO) 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. The catalyst was uniformly black in color. 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 Applications(China)
IPC IPC(8): B01J23/75B01D53/62B01D53/86B01J37/03
CPCY02A50/20
Inventor 赵永祥王永钊高春光刘滇生
Owner SHANXI UNIV
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