Centre Technology Transfer CITTRU

Catalyst for low-temperature decomposition of dinitrogen oxide in tail gases from a nitric acid plant

Posted by Centre Technology Transfer CITTRUResponsive · Innovative Products and Technologies · Poland

Summary of the technology

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

  • 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:
  • high catalytic activity in the presence of other components of tail gases (oxygen, water and other oxides of nitrogen).
  • lack of necessity to use any reducing agents;
  • relatively low operating temperature;

Applications

  • Catalyst based on cobalt oxide doped with nickel and zinc ions is dedicated for the low-temperature decomposition of dinitrogen oxide in tail gases from nitric acid plants, reducing greenhouse gas emissions. Catalyst does not require the use of additional reducing agents.

Additional information (attached documents)

Additional information (attached documents)

Related keywords

  • Outoor Air Pollution/Treatment
  • Clean Production / Green Technologies
  • Environmental Engineering / Technology
  • Other pollution and recycling related
  • Industrial chemicals
  • Catalyst
  • dinitrogen oxide
  • decomposition
  • air pollution
  • nitric acid
  • protection of environment
  • greenhouse gas

About Centre Technology Transfer CITTRU

Technology Transfer Office from Poland

Centre for Innovation, Technology Transfer and University Development (CITTRU) is a part of Jagiellonian University, whose role is to promote university research, to support innovation and to create cooperation with the business. CITTRU main task is to offer the scientific achievements of the Jagiellonian University in the market by providing legal protection, licensing, sale of intellectual property rights, creation of academic business, coordination of company-ordered research projects, etc. Currently promoted technologies are mainly focused on new materials science, pharmacology and medical technology. Inventions offered by Jagiellonian University are promoted and awarded during numerous exhibitions, e.g. 58th International Exhibition of Innovation, Research and New Technologies INNOVA (BRUSSELS 2009), 38th International Exhibition of Invention New Techniques & Products (Geneva 2010) or 24th International exhibition of environmental equipment, technologies and services POLLUTEC (Paris 2009).

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