The catalyst for ozone decomposition

 

(57) Abstract:

The invention relates to heterogeneous catalysts for ozone decomposition and can be used in the production involving ozone: wastewater treatment and processing of semiconductors in the microelectronics industry, etc. the Task of the invention is to provide a catalyst for ozone decomposition activity is in a humid environment exceeds the activity of the known catalyst at 25 and 50%, respectively. The problem is solved by the proposed composition of the catalyst, in the following ratio of components, %: Mn3O47 - 20; CuO 3 - 10; NiO 30 - 50; Calum 30 - 40 (mono and dialuminum calcium). Thus, the proposed composition of the catalyst increases the ratio of decomposition of ozone in dry and humid environments, respectively, at 25 and 50%, which will allow to gain a deeper degree of purification of gas emissions from residual ozone or decrease the amount of used catalyst. table 1.

The invention relates to heterogeneous catalysts for ozone decomposition and can be used in industries involving ozone: wastewater treatment and processing of semiconductors in the microelectronics industry, etc.

A known catalyst for the decomposition of ozone is humid environment g (0.4 to 0,6)10-4.

The objective of the invention is to provide a catalyst for ozone decomposition activity is in a humid environment exceeds the activity of the known catalyst at 25 and 50%, respectively.

The problem is solved by the proposed composition of the catalyst in the following ratio of components, Mn3O47 20; CuO 3 10; NiO 30 - 50; taluma 30 40 (mono and dialuminum calcium).

The difference of the proposed catalyst for the decomposition of ozone from the prototype is that it as the active component further comprises an oxide of Nickel, an oxide of manganese Mn3O4, in the following ratio, wt. Mn3O47 20; CuO 3 10; NiO 30 50; Calum 40. It is established that the introduction of the catalyst of Nickel oxide in the range of 30 to 50% and the remaining components in the above limits increases the activity of the catalyst in dry and wet environment at 25 and 50%, respectively.

The proposed catalyst is produced by mixing the three basic carbonates of the above metals and taluma, pressed into pellets, hydrothermal treatment and subsequent annealing. The proposed catalyst can be called gopalam-H.

Example 1. Shredded about what ETP 5 mm and a height of 6 mm under a pressure of 4 t/cm2. Next, the tablets were subjected to hydrothermal treatment at a temperature of 80oC for 6 h, dried at a temperature of 120oC for 6 h and was progulivali at a temperature of 420oC for 6 hours composition of the obtained catalyst, Tulum 40; NiO 30; CuO 10; Mn3O420.

The synthesized catalyst was used for the decomposition of ozone in dry and wet ozone-oxygen mixtures.

Test conditions catalysts:

the rate of ozone-oxygen mixture 150 l/h,

the input concentration (0.5 to 1%).

For a measure of catalyst activity took the activity coefficient g (coefficient of ozone decomposition), showing the proportion of dissolved molecules in the collision with the surface of the catalyst in the total number of collisions with the surface. The activity coefficient g was calculated by the formula:

< / BR>
where space velocity, cm3;

Co inlet concentration of O3;

C output the concentration of O3;

Vtthermal velocity of the molecules cm/s;

S the external surface of the catalyst, cm2.

The activity of preparation of the catalyst in the dry and wet gas 2.610-4and 1.010-4respectively.

The synthesis of the catalyst in examples 2 to 4 conduct is vnesti obtained catalysts proposed in the table.

Thus, the proposed composition of the catalyst increases the ratio of decomposition of ozone in dry and humid environments, respectively, at 25 and 50% that will allow you to gain a deeper degree of purification of gas emissions from residual ozone or decrease the amount of used catalyst.

The catalyst for the decomposition of ozone containing oxides of manganese, copper and Tulum, characterized in that it further comprises Nickel oxide, and the oxide contains manganese oxide manganese at the following content, wt.

Oxide of manganese 7 20

Nickel oxide 30 50

The copper oxide 3 10

Tulum 30 40

 

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