3 years ago
Promotional synergistic effect of Cu and Nb doping on a novel Cu/Ti-Nb ternary oxide catalyst for the selective catalytic reduction of NOx with NH3
A series of Ti-Nb binary oxide were synthesized by co-precipitation as supports to prepare Cu/Ti-Nb mixed oxide catalysts through wetness impregnation. The novel catalyst 0.8%Cu/Ti2 NbOx exhibited an excellent catalytic activity and N2 selectivity with a broad operation temperature (250–425x with NH3 . A series of analytical techniques including high resolution transmission electron microscopy (HRTEM), N2 -physisorption, X-ray diffraction (XRD), Laser Raman spectra (LRS), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), NH3 temperature-programmed desorption (NH3 -TPD), H2 temperature-programmed reduction (H2 -TPR) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) were used to investigate the correlations among catalyst structure, surface properties and catalytic performance. For the support Ti2 NbOx , the specific surface area was larger than that of TiO2 , promoting the high dispersion of the active component. Also, the surface acid sites were increased by addition of niobium oxide species and the redox capability of the support was enhanced by doping copper species. Moreover, the introduction of copper species effectively enhanced the catalytic performance within 225–4003 -SCR performance over 0.8%Cu/Ti2 NbOx catalyst. Hydrothermal aging treatment experiment demonstrated that 0.8%Cu/Ti2 NbOx catalyst had an excellent hydrothermal stability. In addition, water vapor or/and SO2 had a slightly reversible inhibition influence on the catalytic performance over 0.8%Cu/Ti2 NbOx , indicating that it was a promising candidate for NH3 -SCR catalyst in the future practical application. The reaction pathway over 0.8%Cu/Ti2 NbOx catalyst followed both Eley-Rideal mechanism and Langmuir-Hinshelwood mechanism at 225
Publisher URL: www.sciencedirect.com/science
DOI: S0926337317307580
You might also like
Never Miss Important Research
Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.
Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.