Estimation Of NO x Deposition Velocities For Selected Commercial Photocatalytic Products

The photocatalytic degradation of nitrogen oxides (NOx) employing a wide variety of different materials with titanium dioxide is studied experimentally following diverse approaches; both laboratory tests as ambient air experiments. Then, different approximations are applied to estimate NOx deposition velocities by using the experimental data obtained for the most efficient photocatalytic materials under study. Estimates for NO are of the same order of magnitude but could differ significantly depending on the test or experiment and the numerical method followed for their calculation. Estimates for NO2 could be only inferred from ambient air measurements, giving values of one order the magnitude lower than those for NO.