The method for the reprocessing of irradiated 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 for the regeneration of spent aluminum-palladium catalyst used for purification of gas mixtures of carbon monoxide in the systems of collective and individual protection of respiratory organs and the emissions of industrial enterprises, for purification of exhaust gases of internal combustion engines, as well as for other industrial and environmental purposes. A method for the reprocessing of irradiated aluminum-palladium catalyst for the oxidation of carbon monoxide, comprising the treatment of the catalyst solution moravcikova sodium concentration of 10-20 g/l at 25-60oC for 15-60 min, followed by washing and drying at 110-150oWith the speed of temperature rise 60-250 deg/min the Proposed method can significantly improve the degree of regeneration of spent aluminum-palladium catalyst. table 1.

The invention relates to the field of inorganic chemistry and can be used in particular for the regeneration of spent aluminum-palladium catalyst used for purification of gas mixtures of carbon monoxide in systemforex gases of internal combustion engines, as well as for other industrial and environmental purposes.

There is a method of regeneration of a catalyst containing a platinum group metal, including the treatment of the catalyst with an aqueous solution of nitric, hydrochloric and sulfuric acid at temperatures up to 100oC followed by treatment with an aqueous solution of reducing agent, which is used as formic acid, formaldehyde, etc., followed by rinsing with water and drying (Japan's Bid N 63-293679, publ. 22.11.88,, CL 01 J 23/96, 23/40, 38/48, C 07 B 43/04).

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 spent metal catalyst of the platinum group, including the treatment of the catalyst is 0.001-10 N aqueous solution of alkali and/or alkaline earth metal at a temperature of 5-250oC followed by washing and drying (U.S. Pat. USA N 4147660 from 11.06.78,, CL 01 J 23/96, C 01 B 2/16).

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

The degree of regeneration of the spent catalyst was evaluated CT> The claimed invention is directed to the solution of the following problem: increasing the degree of regeneration of spent aluminum-palladium catalyst, which is achieved by the proposed method includes treatment of the catalyst solution moravcikova sodium followed by washing and drying at a temperature of 110-150oC with the speed of temperature rise 60-250 deg/min

The difference of the proposed method against known is that the drying is carried out at 110-150oC with the speed of temperature rise 60-250 deg/min

Of scientific and technical literature authors unknown process operation carrying out drying at 110-150oC with the speed of temperature rise 60-250 deg/min during regeneration of spent aluminum-palladium catalyst.

The method is as follows.

Take 1-2 kg of spent aluminum-palladium (palladium metal supported on alumina) catalyst and process it 5-10 l of a solution moravcikova sodium concentration of 10-20 g/l at 25-60oC for 15-60 minutes After treatment, the catalyst is washed with distilled water. The washed catalyst was dried at 110-150oC with the speed of temperature rise 60-250 deg/min and the catalyst, obtained by a known method, was 0.60 to 0.70.

Example 1.

Take 1.5 kg of spent aluminum-palladium catalyst and carry out the processing of the 8 l of a solution moravcikova sodium concentration 15 g/l at 40oC within 15 minutes After treatment, the catalyst is washed with distilled water. The washed catalyst was dried at 110oC with the speed of temperature rise 60 deg/min Degree of regeneration of the spent catalyst was 0,81.

Example 2.

A process as in example 1, except the drying temperature, which was 130oC. the Degree of regeneration of the spent catalyst was 0.82.

Example 3.

A process as in example 1, except the drying temperature, which was 150oC. the Degree of regeneration of the spent catalyst of 0.85.

Example 4.

A process as in example 1, except for the speed of temperature rise, which was 150oC. the Degree of regeneration of the spent catalyst was 0.84.

Example 5.

A process as in example 1, except for the speed of temperature rise, which amounted to 250oC. Starfury drying and speed recovery temperature on the degree of regeneration of spent catalyst are shown in table.

As follows from the data shown in the table, the greatest degree of regeneration of spent aluminum-palladium catalyst is achieved by treatment of the catalyst solution moravcikova sodium followed by washing and drying at 110-150oC with the speed of temperature rise 60-250 deg/min At lower drying temperature and rate of temperature rise less than the specified degree of regeneration is reduced. Increasing the drying temperature is more than 150oC leads to the decrease of the degree of regeneration, on the other hand, the increase in the rate of rise of temperature above 250 deg/min does not result in a noticeable change in the degree of regeneration.

The essence of the proposed method is as follows.

Increasing the degree of regeneration of spent aluminum-palladium catalyst in the process of catalyst solution moravcikova sodium followed by washing and drying at 110-150oC with the speed of temperature rise 60-250 deg/min is likely to be due to the following reasons.

When the catalytic oxidation of carbon monoxide are the most active samples of the catalysts with the highest dispersion of the active components is pallavolo catalyst solution moravcikova sodium followed by washing leads to the recovery of palladium to the free metal, possessing high catalytic activity towards carbon monoxide. However, it is known that increasing the size of the particles deposited material contributes significantly to heat treatment at elevated temperatures and high partial pressure of water vapor. This is the reason for the decrease in the dispersion of the active phase and, correspondingly, reduce the catalytic activity. Drying the catalyst at a temperature of less than 110oC does not contribute to the rapid removal of water from the catalyst particles, resulting in the partial pressure of water vapor remains high for a time sufficient to considerably reduce the dispersion of the active phase, leading, ultimately, to the loss of catalytic activity and, accordingly, the degree of regeneration of spent aluminum-palladium catalyst. On the other hand, when drying the catalyst at a temperature of more than 150oC there is an increase in the particle size of the active phase in the increase of sintering of the metal, which also leads to loss of catalytic activity and, accordingly, the degree of regeneration of spent aluminum-palladium catalyst.

Low speed lifting tempo is ltate which the partial pressure of water vapor remains high over time, sufficient to considerably reduce the dispersion of the active phase, which, as noted above, the decrease of catalytic activity and, accordingly, the degree of regeneration of spent aluminum-palladium catalyst. The increase in the rate of rise of temperature above 250 deg/min, apparently, does not affect the dispersion and does not lead to a noticeable change in catalytic activity and, accordingly, the degree of catalyst regeneration.

Thus, the proposed method can significantly improve the degree of regeneration of spent aluminum-palladium catalyst.

Implementation of the proposed method will significantly expand the scope of the catalyst for purification of gas mixtures of carbon monoxide in the systems of collective and individual protection of respiratory organs and the emissions of industrial enterprises, 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 and technological problems.

From the above it follows that each of the signs stated together to a greater or lesser extent avago catalyst, and the entire set is sufficient to characterize the claimed technical solution.

The method for the reprocessing of irradiated aluminum-palladium catalyst for the oxidation of carbon monoxide, comprising the treatment of the catalyst solution moravcikova sodium followed by washing and drying, characterized in that the drying is carried out at 110 - 150oC with the speed of temperature rise of 60 to 250 deg/min

 

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