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In the TunNOx project a highly efficient photocatalytic reactor was developed, which can be integrated into transverse ventilation systems of road tunnels. First, an active photocatalytic coating was developed and tested in the laboratory at variable reactant concentrations, humidity, temperature and irradiance levels. Superior abatement of nitrogen oxides (NOx) and nitrous acid (HONO) was observed even at high NOx levels, low temperature and high humidity, which are typically not beneficial in photocatalysis. Second, by using a porous photocatalytically coated mesh, a prototype reactor was developed, which was adapted to the conditions typically prevailing in tunnel ventilation systems and which could be used as one segment of a larger reactor. Based on experimental results of the abatement of NO, NO2 and diesel exhaust in the prototype reactor a simple model was developed by which NOx abatement of 45–80 % is calculated for typical road tunnel conditions.
Villena et al. (Wed,) studied this question.