Article, 2023

Optimization of high surface area VOx/TiO2 catalysts for low-temperature NH3-SCR for NOx abatement

Journal of Catalysis, ISSN 1090-2694, 0021-9517, Volume 421, Pages 228-239, 10.1016/j.jcat.2023.03.025

Contributors

Nannuzzi, Chiara 0000-0003-2848-6201 [1] Mino, Lorenzo 0000-0002-9882-8361 [1] Bordiga, Silvia 0000-0003-2371-4156 [1] Pedersen, Anders H. [2] Houghton, Jennifer M. [2] Vennestrøm, Peter Nicolai Ravnborg 0000-0002-6744-5640 [2] Janssens, Ton V W 0000-0002-1225-0942 (Corresponding author) [2] Berlier, Gloria 0000-0001-7720-3584 (Corresponding author) [1]

Affiliations

  1. [1] University of Turin
    2. [NORA names: Italy; Europe, EU; OECD];
  2. [2] Umicore ApS, Kogle Allé 1, 2970 Hørsholm, Denmark
    3. [NORA names: Denmark; Europe, EU; Nordic; OECD]

Abstract

We have prepared two series of VOx/TiO2 catalysts (V surface density in the range 1.6–7.7 V at/nm2) employing anatase TiO2 with different surface area (89 and 181 m2/g) to find the optimal composition for the low temperature NH3 Selective Catalytic Reduction and correlate their physico-chemical properties to performance. The same platelet-like morphology was observed for the two TiO2 supports by electron microscopies and X-ray diffraction, indicating that the different surface area is only related to particle size. A higher amount of defective surface sites (undercoordinated Ti4+ sites at edges, corner and steps positions) was found on the high surface area TiO2 by FTIR spectroscopy of CO probe molecule. The distribution of VOx species determined by FTIR and Raman spectroscopies is similar on the two series, reaching the monolayer coverage and maximum activity at ≈ 5 V at/nm2, which can be considered the optimal V density for these catalysts.

Keywords

CO probe molecule, FTIR, FTIR spectroscopy, NH3 selective catalytic reduction, NH3-SCR, NOx, NOx abatement, Raman spectroscopy, TiO2, VOx species, VOx/TiO2, VOx/TiO2 catalyst, X-ray, X-ray diffraction, abatement, activity, anatase, anatase TiO2, area, catalyst, catalytic reduction, composition, coverage, defect surface sites, diffraction, distribution, distribution of VOx species, electron, electron microscopy, high surface area TiO2, low-temperature NH3-SCR, low-temperature NH3-selective catalytic reduction, microscopy, molecules, monolayer, monolayer coverage, morphology, optimal composition, optimization, particle size, particles, performance, platelet-like morphology, probe molecules, properties to performance, reduction, selective catalytic reduction, series, sites, size, species, spectroscopy, surface, surface area, surface area TiO2, surface sites

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