Catalytic reduction of NO by NH3 over Fe–Cu–OX/CNTs-TiO2 composites at low temperature

Activity of iron–copper oxides supported on TiO2 and carbon nanotubes (CNTs) for low-temperature selective catalytic reduction of NO by NH3 in the presence of oxygen was investigated. The addition of FeOX and CNTs synergistically promoted the NO conversion through the adsorption of NO and NH3 and the catalytic oxidation of NO to NO2. NO2 adsorbed on the surface of the catalysts was found to be essential for NO reduction at low temperature, and approximately 90% NO conversion could be achieved at reaction temperature as low as 150 °C. Moreover, it was found that the deactivation caused by H2O could be recovered after H2O was switched off, while the deactivation caused by SO2 was dependent on the reaction temperature.

Figure optionsDownload high-quality image (217 K)Download as PowerPoint slideHighlights
► Fe–Cu–OX/TiO2-CNTs composites were prepared by a sol–gel method.
► A NOX conversion of 90% was achieved at 150–300 °C.
► The additions of FeOX and CNTs synergistically promote the NOX conversion.
► Adsorbed NO2 on the surface is important for NOX reduction at low temperature.
► The reactions follow both the L–H and E–R mechanism.