An activation process for a carbon monoxide removal catalyst

Abstract

The application discloses an activation process of a carbon monoxide removal catalyst, and forms an activation layer of NH4HCO3-NH4ClO in the carbon monoxide removal catalyst through a two-step deposition method, and then the carbon monoxide removal catalyst can be activated by heating.

Description

Technical Field

[0001] This invention relates to catalyst activation processes, and more particularly to an activation process for a carbon monoxide removal catalyst. Background Technology

[0002] Carbon monoxide removal catalysts can effectively convert CO into CO2 and are widely used in waste gas treatment, air purification, gas masks and other fields.

[0003] Carbon monoxide removal catalysts include various systems, which can be broadly classified into noble metal catalysts and non-noble metal catalysts. Noble metal catalysts generally include gold, platinum, palladium, rhodium, etc., which are characterized by high efficiency but high price. Non-noble metal catalysts include copper-chromium systems, copper-zinc systems, copper-manganese systems, etc., which are characterized by poor residual efficiency and sensitivity to water vapor.

[0004] Both the precious metal catalysts and the non-precious metal catalysts mentioned above have a limited lifespan, after which their treatment efficiency will decrease, leading to a reduction in carbon monoxide removal efficiency. Furthermore, carbon monoxide removal catalysts cannot be used as disposable items; they need to be activated to enable reuse.

[0005] Experiments have shown that placing the carbon monoxide removal catalyst in a high-temperature, high-pressure hydrogen atmosphere can effectively activate it. However, since hydrogen is a flammable and explosive gas, and the high-temperature, high-pressure conditions are harsh and dangerous, it is difficult to popularize. Summary of the Invention

[0006] This invention develops an activation process for a carbon monoxide removal catalyst. An activation layer of NH4HCO3-NH4ClO is formed in the carbon monoxide removal catalyst through a two-step deposition method, and then the catalyst is activated by heating.

[0007] An activation process for a carbon monoxide removal catalyst, the specific activation process being as follows:

[0008] (1) Take a 1%-2% (NH4)2CO3 aqueous solution, immerse it with 2-3 times its mass of the carbon monoxide removal catalyst to be activated and adsorb it completely, and then freeze dry it.

[0009] (2) Take a 3%-5% HClO aqueous solution, where the HClO content is equal to the molar amount of (NH4)2CO3 in step (1), atomize it and introduce it into the carbon monoxide to be activated to remove the catalyst with clean air until the adsorption is complete. Keep it moist at this temperature for 1-2 hours, and then dry it with dry and cold air.

[0010] (3) Place it in an oven and process it for 1-2 hours to obtain an activated carbon monoxide removal catalyst.

[0011] Furthermore, step (2) is performed entirely at 10-20℃.

[0012] Further, in step (2), the dry, cold air is blown to dry the product until the moisture content is below 10%.

[0013] Furthermore, the temperature of the oven in step (3) is 80℃-100℃.

[0014] Advantages of this invention:

[0015] 1. This invention first deposits (NH4)2CO3, then adsorbs HClO, and controls the molar amounts of (NH4)2CO3 and HClO to form an activation layer of NH4HCO3-NH4ClO in a two-step deposition method. Then, by raising the temperature, the carbon monoxide removal catalyst can be activated.

[0016] 2. Step (2) of this invention needs to be carried out at a lower temperature to prevent the NH4HCO3-NH4ClO activation layer from decomposing prematurely;

[0017] 3. In step (2) of this invention, the moisture content of the dry air drying process must be strictly controlled, as the moisture content will affect the subsequent activation effect. Detailed Implementation

[0018] The same batch of palladium-platinum system carbon monoxide removal catalysts to be activated were used for activation in the following examples and comparative examples.

[0019] Example 1

[0020] An activation process for a carbon monoxide removal catalyst, the specific activation process being as follows:

[0021] (1) Take a 1.6% (NH4)2CO3 aqueous solution, immerse it in twice the mass of the carbon monoxide removal catalyst to be activated and adsorb it completely, and then freeze dry it.

[0022] (2) Take a 3.5% (w / w) aqueous solution of HClO, wherein the HClO content is equal in molar amount to (NH4)2CO3 in step (1), atomize it and introduce it into the carbon monoxide to be activated to remove the catalyst with clean air until the adsorption is complete. Keep it moist at this temperature for 1.5 hours, and then dry it with dry and cold air until the water content is 8%. This step is carried out at 18℃ throughout.

[0023] (3) Place it in an oven at 95°C and treat for 1.5 hours to obtain an activated carbon monoxide removal catalyst.

[0024] After the activated carbon monoxide removal catalyst is treated once by the above activation process, it can be activated and the effect is comparable to that of treatment in a high-temperature and high-pressure hydrogen atmosphere.

[0025] Comparative Example 1

[0026] (NH4)2CO3 was replaced with NH4HCO3. The molar amount of NH4HCO3 was twice that of (NH4)2CO3, but it did not adsorb HClO aqueous solution. The drying process was the same as in Example 1.

[0027] After one treatment using the above process, the catalytic efficiency of the activated carbon monoxide removal catalyst is only slightly improved; after the fifth treatment, the catalytic efficiency is significantly improved, but it is still weaker than that of Example 1.

[0028] Comparative Example 2

[0029] (NH4)2CO3 was not used; instead, HClO aqueous solution was directly adsorbed. The amount of HClO used was twice that of Example 1, and the drying process was the same as that of Example 1.

[0030] In this process, HClO decomposes during the drying with cold air after adsorption, resulting in a very poor activation effect.

[0031] Comparative Example 3

[0032] The operation of adsorbing HClO in step (2) of Example 1 is taken as step (1), and the operation of depositing (NH4)2CO3 in step (1) of Example 1 is taken as step (2). The drying process is the same as that in Example 1.

[0033] The activation effect of this process is very poor, basically the same as that of Comparative Example 2.

[0034] Comparative Example 4

[0035] Step (2) involves drying the product with cold air until the moisture content is 15%. All other operations are the same as in Example 1.

[0036] This process requires two treatments to achieve the activation effect of Example 1.

[0037] Comparative Example 5

[0038] The processing temperature in step (2) is controlled at 25 degrees Celsius, and the remaining operations are the same as in Example 1.

[0039] This process also requires two treatments to achieve the activation effect of Example 1.

[0040] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An activation process for a carbon monoxide removal catalyst, characterized in that: The activation process is as follows: (1) Take a 1%-2% (NH4)2CO3 aqueous solution, immerse it with 2-3 times its mass of the carbon monoxide removal catalyst to be activated and adsorb it completely, and then freeze dry it. (2) Take a 3%-5% HClO aqueous solution, where the HClO content is equal to the molar amount of (NH4)2CO3 in step (1), atomize it and introduce it into the carbon monoxide to be activated to remove the catalyst with clean air until the adsorption is complete. Keep it moist at this temperature for 1-2 hours, and then dry it with dry and cold air. (3) After being placed in an oven and treated for 1-2 hours, an activated carbon monoxide removal catalyst is obtained. Step (2) must be performed at 10-20℃ throughout; Step (2) Dry with cold air until the moisture content is below 10%.

2. The activation process of the carbon monoxide removal catalyst according to claim 1, characterized in that: The temperature of the oven in step (3) is 80℃-100℃.