The regeneration method of the aluminum-palladium catalyst for the oxidation of carbon monoxide

 

(57) Abstract:

The invention relates to the field of inorganic chemistry and can be used, in particular, to restore the activity of the palladium catalyst used for equipment products, such as filter cartridges, used for the purification of gas mixtures of carbon monoxide in the systems of collective and individual protection of respiratory organs, for equipment catalytic converters for purifying exhaust gases of internal combustion engines, as well as for other industrial and environmental purposes. Describes how the regeneration of the aluminum-palladium catalyst for the oxidation of carbon monoxide, comprising the treatment of the catalyst gas nitrogen mixture. First, the catalyst is treated with gaseous nitrogen, then the nitrogen-containing compound, and take nitric mixture ratio of nitrogen and hydrogen 12 : (0,05-0,30), processing is carried out at 20 to 100C for 20-40 min, then treated with gaseous nitrogen. The method allows to significantly increase the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties while maintaining high is organic chemistry and can be used in particular, to restore the activity of the catalyst used for equipment items (filter cartridges, gas masks, self-rescuers), used for the purification of gas mixtures of carbon monoxide in the systems of collective and individual protection of respiratory organs, to curb catalytic converters for purifying exhaust gases of internal combustion engines, as well as for other industrial and environmental purposes.

The known method of regeneration ruteniysoderzhaschim catalyst comprising regeneration by heating at a temperature of 150-350oC and a pressure of 0.1-10 mm RT. Art. and subsequent reduction with hydrogen at a temperature of 100 to 600oC during the period of time required for activation (U.S. Pat. USA N 4331557 from 22.05.80,, CL 01 J 23/96, 21/42).

The disadvantage of this method is the low degree of regeneration of spent catalyst.

Closest to the proposed technical substance and the number of matching characteristics is a method of regeneration of the aluminum-palladium catalyst includes treatment of the catalyst attivazione mixture containing 0.5 to 5.0. % oxygen at a temperature of 260-350oC with subsequent restoration of the waters of izlagaemogo invention.

The disadvantage of this method is the small number of regeneration cycles.

The claimed invention is directed to the solution of the following problem: the increase in the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties while maintaining at a high level, the degree of regeneration of the catalyst, which is achieved by the proposed method includes treatment of the catalyst gas nitrogen mixture, with the first catalyst is treated with gaseous nitrogen, then the nitrogen mixture, and take nitric mixture ratio of nitrogen and hydrogen is 1:(0,05-0,30), processing is carried out at a temperature of 20-100oC for 20-40 minutes, then treated with gaseous nitrogen.

The difference of the proposed method against known is that the first catalyst is treated with gaseous nitrogen, then the nitrogen mixture, and take nitric mixture ratio of nitrogen and hydrogen is 1:(0,05-0,30), processing is carried out at a temperature of 20-100oC for 20-40 minutes, then treated with gaseous nitrogen.

Of scientific and technical literature authors unknown Tue, consisting of nitrogen and hydrogen in the ratio of 1: (0,05-0,30).

The degree of regeneration of the catalyst was evaluated as the ratio of the activity of the catalyst after regeneration to the initial activity of the catalyst, i.e., conforming to the requirements documentation.

The method is as follows.

The aluminum-palladium catalyst (palladium metal supported on alumina) is treated with gaseous nitrogen for 10 minutes, then the mixture of nitrogen and hydrogen in the ratio of 1:(0,05-0,30) at a temperature of 20-100oC for 30 minutes, then nitrogen gas for 10 minutes. Treatment of the catalyst can be carried out, when the latter is in part filled them filter cassettes, catalytic Converter, etc., and rasaratnam condition. The number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties, when using the proposed method was 11-17, the degree of regeneration of the catalyst was 0.92 to 1.00. The number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties, etc is CLASS="ptx2">

Example 1.

The aluminum-palladium catalyst is treated with gaseous nitrogen for 10 minutes, then a gas mixture consisting of nitrogen and hydrogen in the ratio of 1: 0.05 at a temperature of 20oC for 30 minutes, then nitrogen gas for 10 minutes. The number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties amounted to 14, the degree of regeneration of the catalyst was 0.92.

Example 2.

A process as in example 1 except the ratio of nitrogen and hydrogen, which was 1: 0.15 in. The number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties amounted to 13, the degree of regeneration of the catalyst amounted to 1.00.

Example 3.

A process as in example 1 except the ratio of nitrogen and hydrogen, which amounted to 1:0,30. The number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties amounted to 15, the degree of regeneration of the catalyst amounted to 0.98.

Primr>oC. the Number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties amounted to 15, the degree of regeneration of the catalyst amounted to 1.00.

Example 5.

A process as in example 1, except temperature processing, which amounted to 100oC. the Number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties amounted to 11, the degree of regeneration of the catalyst was 0.99.

The time interval of the catalyst gas mixture of nitric set experimentally. For example, when processing the loaded catalyst filter cassettes at a temperature of 25oC gas mixture consisting of nitrogen and hydrogen in the ratio of 1:0,20, less than 20 min, the degree of regeneration of the catalyst was 0.69; at 30 min - 0,99; and at 40 min to 1.00.

The effect of the ratio of nitrogen : hydrogen and temperature treatment on the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties, and steece, the greatest increase in the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties, while maintaining at a high level, the degree of regeneration of the catalyst is observed when processing aluminum-palladium catalyst at a temperature of 20-100oC for 20-40 min of a gas mixture consisting of nitrogen and hydrogen in the ratio of 1: (0,05-0,30). At processing temperatures above 100oC there is a significant decrease in the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties, the degree of regeneration of the catalyst is maintained at a sufficiently high level. When the hydrogen content is less than 0.05 there is a significant reduction in the degree of regeneration of the catalyst, at that time, as the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties remains high. On the other hand, when the hydrogen content of more than 0,30 any noticeable changes in the number of regeneration cycles, after which the loaded catalyst filter cartridge sohra.

The essence of the proposed method is as follows.

The increase in the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties, while maintaining at a high level, the degree of regeneration of the catalyst during the processing of a catalyst with a gas mixture consisting of nitrogen and hydrogen in the ratio of 1: (0,05 - 0,30) at a temperature of 20-100oC for 20-40 min, is likely to be due to the following reasons. Pre-treatment with gaseous nitrogen leads to the complete removal of oxygen from the catalyst particles, which makes further thermodynamically impossible for the oxidation of palladium. The result of the subsequent treatment of the catalyst with a gas mixture consisting of nitrogen and hydrogen in the ratio of 1:(0,05-0,30), at a temperature of 20-100oC for 20-40 min is the recovery of palladium to the free metal, which is actually a carrier of a catalytic properties. The content of hydrogen, which plays the role of reducing agent, less than 0.05 and the time of regeneration less than 20 min is sufficient for full recovery of palladium, which leads to a significant decrease in risky impractical because hydrogen is much more expensive than nitrogen, and a notable increase in the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties, as well as the degree of regeneration of the catalyst is not observed. Carrying out processing at a temperature not exceeding 100oC completely eliminates the possibility of thermal deformation of parts and components of the filter cartridge, which is the main reason for the increase in the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance characteristics. The final operation is the treatment of the regenerated catalyst with gaseous nitrogen, resulting in the removal of catalyst particles of the gaseous products of the recovery of palladium.

Thus, the method has been changed significantly increase the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties while maintaining at a high level degree of regeneration.

Implementation of the proposed method will significantly expand the area under the protection of the respiratory organs, for purification of exhaust gases of internal combustion engines, as well as for other industrial and environmental objectives that will provide an opportunity to effectively solve a wide range of environmental problems.

From the above it follows that each of the signs stated together to a greater or lesser extent affect the solution of the problem, namely: to increase the number of regeneration cycles, after which the loaded catalyst filter cartridge keeps its original performance properties while maintaining at a high level, the degree of regeneration of the catalyst, and the entirety is sufficient to characterize the claimed technical solution.

1. The regeneration method of the aluminum-palladium catalyst for the oxidation of carbon monoxide, comprising the treatment of the catalyst nitrogen gas mixture, characterized in that the first catalyst is treated with gaseous nitrogen, then the nitrogen mixture, and take nitric mixture ratio of nitrogen and hydrogen is 1 : (0,05 - 0,30), processing is carried out at 20 - 100oC for 20 - 40 min, then treated with gaseous nitrogen.

2. The method according to p. 1, characterized in that the catalyst treatment

 

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