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Noxer - Improving air quality

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Combustion reactions produce nitrogen compounds such as nitrogen monoxide (NO) and nitrogen …

Combustion reactions produce nitrogen compounds such as nitrogen monoxide (NO) and nitrogen
dioxide (NO2), commonly known as NOx. They are a factor in the formation of acid rain and summer
smog. A substantial proportion of the NOx generated comes from automobile exhaust. In its
ongoing endeavour to develop roads that are increasingly safe, aesthetic and environmentally
friendly, Eurovia has embarked on a pro-active environmental policy. The company has developed
the innovative NOxer process to efficiently and effectively combat pollution and provide optimum comfort for road users and local residents.

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  • 1. COMBATING POLLUTION NOxer Improving air quality
  • 2. NOxer THE PROCESS THAT COMBATS POLLUTION Combustion reactions produce nitrogen compounds such as nitrogen monoxide (NO) and nitrogen dioxide (NO2), commonly known as NOx. They are a factor in the formation of acid rain and summer smog. A substantial proportion of the NOx generated comes from automobile exhaust. In its ongoing endeavour to develop roads that are increasingly safe, aesthetic and environmentally friendly, Eurovia has embarked on a pro-active environmental policy. The company has developed the innovative NOxer process to efficiently and effectively combat pollution and provide optimum comfort for road users and local residents. KEY BENEFITS A daptable to many types of road infrastructure (pavements, cobblestones, noise barriers, tunnel entrances, paint, etc.) KEY figures Pollution reduction exceeding 4mg/m2/hr echanical and safety performance M remains unchanged ollution reduction at source over P broad surfaces ighly effective in combating H atmospheric pollution ptimum comfort for residents and O users nvironmental enhancement of E roads Overall pollution reduction of 15 to 25%
  • 3. HIGHLY INNOVATIVE POLLUTION REDUCTION A MULTI-PURPOSE PROCESS Research carried out by Eurovia resulted in the development of an effective and reliable process that can be used in a wide variety of applications. NOxer is used as a coating on vertical structures (noise barriers) and horizontal substrates (roads and cobblestones). By adapting the various materials (slurries, paints, etc.), NOxer can also be applied in confined spaces (tunnels, car parks), where the use of appropriate lighting and specific catalysers is sufficient to initiate the chemical reaction. NOxer SERVES THE ENVIRONMENT The reaction does not displace pollution. The concentrations of nitrogen compounds removed by rainwater runoff are very small. Pollution reduction is therefore limited, over time, only by the service life of the substrate to which the NOxer coating has been applied. The additional cost of the technology is small, yet it significantly reduces the concentration of airborne pollutants that can cause discomfort and respiratory complications. SUSTAINABLE INNOVATION The reaction requires no energy input other than light. Its remains effective over time since the active ingredient acts as a catalyst: it is neither consumed nor altered during the reaction. Titanium dioxide is a stable, chemically and biologically inert compound. It can be recycled and the substrate to which it is applied can be recycled at the end of its service life.
  • 4. PROVEN EFFECTIVENESS To optimise the process, Eurovia’s research centre has developed a number of analytical systems to measure the performance of the NOxer process in the laboratory. The test consists in measuring pollution levels in air flowing through a reactor containing a specimen of the NOxer coating. In light equivalent to that of a sunny day, 75% of the NOx entering into contact with the coating are eliminated; in light equivalent to that of a cloudy day, the process remains highly active. Nitrogen oxide (NOx) concentration (ppb) 1,000 900 IN SITU TESTS SUBSTANTIATING PERFORMANCE A large number of measurement campaigns using highperformance analytical resources are being carried out to estimate the gain in air quality achieved by NOxer. Monitoring protocols have been developed for the entire NOxer range, using a specially adapted autonomous vehicle and other resources. The measurements are carried out either in line by standardised NOx analysers or by passive sampling devices. Effectiveness has been demonstrated for each of the NOxer applications (noise barriers, pavements, etc.). The photocatalytic reaction produces stable nitrogen compounds that are washed off the coating in water either naturally by rain or mechanically by spraying. Process activation 800 700 600 500 400 300 Light: cloudy day Light: sunny day 200 100 0 Time TECHNICAL DEPARTMENT 18, place de l’Europe - 92565 Rueil-Malmaison cedex Tel.: +33 1 47 16 38 00 - Fax: +33 1 47 16 38 01 www.eurovia.com technique@eurovia.com - December 2013 – 500 copies – Photos: Eurovia photo library CONCLUSIVE LABORATORY TEST RESULTS

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