Open AccessWO₃/CeO₂/TiO₂ Catalysts for Selective Catalytic Reduction of NOx by NH₃: Effect of the Synthesis Method
Author(s) -
Katarzyna Michalow-Mauke,
Yonglai Lu,
Davide Ferri,
Thomas Graule,
Kazimierz Kowalski,
Martin Elsener,
Oliver Kröcher
Publication year - 2015
Publication title -
chimia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.387
H-Index - 55
eISSN - 2673-2424
pISSN - 0009-4293
DOI - 10.2533/chimia.2015.220
Subject(s) - catalysis , nox , selective catalytic reduction , chemical engineering , materials science , desorption , ammonia , inorganic chemistry , chemistry , adsorption , organic chemistry , combustion , engineering
WO3/CeO2/TiO2, CeO2/TiO2 and WO3/TiO2 catalysts were prepared by wet impregnation. CeO2/TiO2 and WO3/TiO2 showed activity towards the selective catalytic reduction (SCR) of NOx by NH3, which was significantly improved by subsequent impregnation of CeO2/TiO2 with WO3. Catalytic performance, NH3 oxidation and NH3 temperature programmed desorption of wet-impregnated WO3/CeO2/TiO2 were compared to those of a flame-made counterpart. The flame-made catalyst exhibits a peculiar arrangement of W-Ce-Ti-oxides that makes it very active for NH3-SCR. Catalysts prepared by wet impregnation with the aim to mimic the structure of the flame-made catalyst were not able to fully reproduce its activity. The differences in the catalytic performance between the investigated catalysts were related to their structural properties and the different interaction of the catalyst components.