Method of activating carbon monoxide oxidation catalyst

FIELD: oxidation catalysts.

SUBSTANCE: invention relates to sorption engineering and can be used for regeneration of different kinds of hopcalite lost catalytic activity during long-time storage. Regenerated sorbents can be used un respiratory masks and in processes or removing carbon monoxide from industrial emissions. Invention provides a method for activating carbon monoxide oxidation catalyst involving heat treatment thereof and characterized by that activation is conducted by heating catalyst bed 2-3 cm thick to 180-380°C at temperature rise velocity 10-20°C/min while constantly carrying away reactivation products.

EFFECT: enabled restoration of catalytic activity.

3 ex

 

The invention relates to the field of sorption techniques, namely the clean air mixtures of carbon monoxide and can be used for regeneration of different types of catalyst for the oxidation of carbon monoxide (hopcalite), have lost their catalytic activity during long-term storage.

The regenerated sorbent can be used in methods of respiratory protection and purification of industrial emissions of carbon monoxide.

There are different ways of activation of hopcalite, for example, by heat treatment at 550-850°WITH (EN 2063803, 20.07.96) or drying gas-air mixture when the temperature increases from 40-75 up to 150-250°WITH (EN 2035997, 27.05.96).

Using the known activation method does not lead to full recovery of hopcalite.

The closest in technical essence and the achieved results is an activation method of hopcalite by heat treatment of the layer at t=120-320°C, a pressure of 200-400 kg/m2, gas mixture composition, vol.%:

CO2- 0,4-1,0;

WITH not more than 0.01;

O2- 16-22;

Nitrogen and inert gases - leave

The disadvantage of the prototype is the impossibility of full recovery of the initial activity of the catalyst after long-term storage and stability of its activity through air purification.

The invention which is the recovery of the initial activity of the catalyst for oxidation of carbon monoxide after a long storage period.

The problem is solved by the proposed method activation catalyst for the oxidation of carbon monoxide by thermal processing, and activation of the catalyst is lead by heating the catalyst layer thickness of 2-3 cm to 180-380°With the speed of temperature rise 10-20°/min at a constant tap of products of reactivation.

Of scientific and technical literature the authors do not know the method of activation of the catalyst for oxidation of carbon monoxide by heating the layer thickness of 2-3 cm with speed of temperature rise 10-20°/min

The essence of the method consists in the following.

The catalyst for the oxidation of carbon monoxide (hopcalite) is a mixture of active oxides of copper and manganese. During long-term storage hopcalite well absorbs moisture from the air, thus there is the hydration of the active centers (manganese dioxide) with the formation of crystalline hydrates, which shield the active centers, thereby making it difficult to access carbon monoxide to them and reducing the efficiency of the catalyst as a whole. The process of oxidation WITH oxygen occurs on MnO2who is restored to MnO, and then MnO again oxidized to MnO2resulting in the alternate oxidation and reduction of the catalyst surface at high speed this process provides is raised by the presence of oxygen centers on the surface of hopcalite.

Thus the activation process hopcalite needed so that with one hand - held deep dehydration of the active centers, which occurs at t°>180°and on the other you want to save the saturation of the active surface oxygen, which is provided with a stationary process with constant removal of the reaction products.

As a result of numerous experiments were able to optimize the parameters of the activation process, which allows you to restore the catalyst activity. Empirically set temperature range of the heat treatment, the speed of temperature rise and the thickness of the catalyst layer.

The method is as follows.

Take the inactive catalyst for the oxidation of carbon monoxide, wet during storage to a moisture content of 3-25%, load it in a pan with a layer of 2-3 cm and placed in a chamber (stationary) furnace exhaust products vacuum or by fans. Turn up the heat with a speed of 10-20°/min to t=180-380°C, maintain the product at this temperature for 1-5 hours to produce mixing of the catalyst and the vacuum or suction fan reaction products. The process is carried out to obtain a catalyst with moisture content less than 1.0%. Next, the finished product is unloaded in a sealed container and analyzer the Ute to the dynamic activity of the carbon monoxide.

Example 1

Take 250 kg of inactive catalyst with dynamic activity 10 min (initial activity 46 min), moisture 8%, and load in pallets of 50 kg, the thickness of the product layer thickness is 2.0 cm, placed in a drying chamber furnace, equipped with exhaust ventilation, and turn up the heat with a speed of 10°/min to t=180°C, maintain the catalyst at this temperature for 5 hours, stir every 15-20 minutes Continuously running exhaust ventilation allows removal of reaction products from the working zone of the furnace. The finished product with a moisture content of 0.5% unload in sealed steel drums, cool and carry out tests on the dynamic activity of the carbon monoxide. The estimation of the dynamic activity of the catalyst is carried out on a dynamic device DP-2, the test conditions are the following:

the concentration of carbon monoxide to 6.2+/-0,3 mg/l;

- layer height - 2.5 cm;

- specific flow rate of the gas mixture of 0.32+/-0,01 DM3rpm·cm2;

the absolute humidity of the gas mixture of 8.6+/-0,3 mg/l;

the temperature at test 23+/-5°C.

The resulting catalyst had a dynamic activity 46 minutes

Example 2

Take 300 kg of inactive catalyst with dynamic activity 15 min (initial activity 48 min), moisture 6%, and load the pallets 60 kg, the thickness of the layer about the ukta is 3.0, see Next, the process is conducted as in example 1 except that the heating include speeds of 15°/min up to t=250°C and the product can withstand 4 hours.

The resulting catalyst had a dynamic activity 48 minutes

Example 3

Take 300 kg of inactive catalyst with dynamic activity 8 min (initial activity 45 min), moisture 10%, loaded onto pallets and lead the process as in example 2 except that the heating lead with the speed of 20°/min to t=380°C and the product is kept in a furnace for 3 hours.

The resulting catalyst had a dynamic activity 46 minutes

Empirically chosen and the optimal modes of activation, the choice of the main parameters of the following reason. At a temperature of less than 180°unable to carry out the dehydration oxygen centers, and when t>380°the process of recovery of active Mn+4to inactive Mn+2. The thickness of the catalyst layer during the heat treatment is chosen in such a way as to achieve an optimal balance between the process of removing water from the surface of the grains of the catalyst and removal of products from the working area of termoaparata. The speed of temperature rise within 10-20°/min ensures a gradual and uniform heating of the catalyst layer, as heating with a higher speed at high humidity catalyst (8-25%) is riodic to intensive allocation of water vapor in the beginning of the process, and heating with a rate of less than 10°/min economically feasible.

The proposed method allows you to completely restore the original activity of the catalyst for oxidation of carbon monoxide.

As follows from the above, each of the signs stated together to a greater or lesser extent affect the achievement of objectives, and the entirety is sufficient to characterize the claimed technical solution.

The activation method of the catalyst for oxidation of carbon monoxide, including its heat treatment, characterized in that the activation lead by heating the catalyst layer thickness of 2-3 cm to 180-380°With the speed of temperature rise 10-20°/min at a constant tap of products of reactivation.



 

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