Innovation provider

Jagiellonian University


Radosław Rudź
phone: +48 12 663 38 32
fax: +48 12 663 38 31


Dinitrogen oxide (N2O) is formed as a by-product of inter alia the catalytic oxidation of ammonia in nitric acid manufacture plants. N2O emissions significantly contribute to the greenhouse effect, because it accumulates heat about 310 times more efficiently than CO2. In addition, it can affect the destruction of the stratospheric ozone layer. Therefore, it is necessary to ensure their efficient elimination of exhaust gases, both for stationary sources (industrial plants) and mobile (vehicles with combustion engines).
The subject of the technological offer is the catalyst for the low-temperature decomposition of dinitrogen oxide in the tail gases from the nitric acid plant. Active ingredient of the catalyst is mixed oxide of cobalt, zinc and nickel, promoted by alkali metals (sodium and potassium) affecting the increase of catalytic activity, and by alkaline-earth metals (magnesium and calcium) added to facilitate the shaping, while providing appropriate structure and strength at the same time. The catalyst is active already at 50°C and the 90% N2O conversion is obtained below 350°C.


Low-temperature catalytic decomposition of dinitrogen oxide, carried out by the developed catalytic system which is the subject of the offer, is much more favorable in comparison with other solutions because of:
  • no need for using any reducing agents;
  • relatively low operating temperature;
  • high catalytic activity in the presence of other components;
  • of tail gases (oxygen, water and other oxides of nitrogen).

Innovative aspects (ecologic, social and economic)

Application examples

Experimental studies, both in the laboratory scale and in the pilot plant, carried out for several prototype catalysts confirmed the high catalytic activity of offered materials.
The degree of decomposition of dinitrogen oxide in a mixture of N2O and He, at a temperature of 300°C was 95%, while
decomposition products were only molecular nitrogen and oxygen. The pilot plant at a temperature of 350°C revealed
the degree of decomposition of dinitrogen oxide was higher than 90%.



Current stage of development

Available for demonstration – field tested

Intellectual Property Rights

Patent applied for

Country of origin


Country of application




National Contact Point

dr Włodzimierz A. Sokół
National Contact Point for Eco-efficient Technologies and Management Systems
Central Mining Institute (GIG)

Plac Gwarkow 1
40-166 Katowice

Tel: +48 32 259 22 11
Fax: +48 259 22 11