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:
•lack of necessity to use 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).
Experimental studies, both in the laboratory scale and in the pilot plant at the Fertilizers Research Institute in Puławy (Poland), carried out for several prototype catalysts confirmed the high catalytic activity of materials offered. These studies consisted of:
•passing a mixture of nitrous oxide and helium through the bed of a catalyst placed in a quartz reactor,
•passing a tail gases from the pilot plant of nitric acid manufacturing, characterized by the same composition as the tail gases in the real industrial plant, through the catalytic system, and then determining the tail composition after reaction.
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%.
Description of the technology
Subject of the offer is a catalyst based on cobalt oxide doped with nickel and zinc ions, for the low-temperature decomposition of dinitrogen oxide in tail gases from nitric acid plants, reducing greenhouse gas emissions. Catalyst is active already at 50°C and the 90% of N2O conversion is obtained below 350°C. Additional advantage of the catalyst is no necessity to use additional reducing agents.
Specifications
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.
Main advantages of its use
Applications
Additional information (attached documents)
Jagiellonian University, founded 1364, is the oldest university in Poland and one of the oldest worldwide. The research and teaching activities are conducted at 15 faculties, including the Medical College (Collegium Medicum). Over 3,700 researchers work at the university and the total number of students is about 50,000.
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