NOx Reduction by Ozone Oxidation

NOx Reduction by Ozone Oxidation

Nitrogen oxides (NOx) refer to a group of reactive gases that include nitric oxide (NO) and nitrogen dioxide (NO2). These compounds are produced during combustion processes, such as those occurring in vehicles, power plants, and industrial facilities. While NOx itself is not directly harmful, its atmospheric reactions and secondary products can have several adverse effects on the environment and human health. 

The Business Pain Points of High NOx Emissions

For businesses, the challenges associated with high NOx emissions are multifaceted. Here are some of the pain points:

  • Regulatory Compliance: Most countries have strict regulations governing NOx emissions. Non-compliance can result in substantial fines, legal actions, and a damaged reputation.
  • Operational Costs: High emissions often signal inefficiencies in fuel use, which can escalate operational costs. Moreover, the costs associated with upgrading equipment to meet emission standards can be significant.
  • Public Image and Marketability: As public awareness about environmental issues grows, companies with high emissions may face backlash from consumers and investors, potentially affecting market shares and profitability.

Applying Ozone

The characteristics of ozone application in the oxidation and denitrification industry are notable. Ozone exhibits a high selectivity towards NOx and acts rapidly, with ozone being able to complete the oxidation of NO within approximately 0.05 seconds. To enhance the absorption of oxidized products, it is recommended to strengthen the spray absorption process at the backend. Remarkably, without heating the flue gas, N2O5 can be readily absorbed by the lye. Additionally, ozone facilitates the oxidation and removal of heavy metals such as mercury and other pollutants. Notably, a high concentration of dust or solid particles in flue gas does not affect NOx removal efficiency. Moreover, ozone production can be flexibly adjusted based on the NOx concentration of the flue gas.

According to the complex oxidation reaction process of O3 for NOx, in fact, it is finally reflected through the change of the valence state of N. The main reactions are as follows:




nox reduction


  • Configurable NOx reduction rates scaling from min. 30% to 95%-plus
  • Effective treatment of a wide range of nitrogen oxides and harmful pollutants – also in conjunction with various Air Pollution Control (APC) equipment
  • A future-proof solution capable of meeting evolving NOx regulations
  • Low CAPEX when inlet NOx is of moderate level and existing APC equipment can be used
  • Transparent costs with ozone consumption reflecting removal efficiency
  • No need to interfere with / modify existing combustion equipment or to reheat the flue gas to high temperatures
  • No need to store hazardous chemicals required for traditional abatement processes

Economic Benefits of Ozone-Based NOx Reduction for Businesses

Implementing ozone technology not only assists in achieving regulatory compliance but also delivers several economic benefits:

  • Reduction in Regulatory Fines: Adhering to emission standards helps avoid costly penalties.
  • Operational Efficiency: Enhanced combustion efficiency reduces fuel costs.
  • Enhanced Corporate Image: Embracing green technology improves public perception and investor confidence.
  • Market Opportunities: Sustainability leaders often gain access to new markets and customer segments.
  • Long-term Cost Savings: The initial costs are generally offset by long-term savings from operational efficiencies and fewer penalties.

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