Improved high temperature stability of NH3-SCR catalysts based on rare earth vanadates supported on TiO2WO3SiO2

XAFS Study on the Specific Deoxidation Behavior of Iron Titanate Catalyst for the Selective Catalytic Reduction of NOx with NH3

“…[3][4][5][6] Although this catalyst system has been utilized for several decades in industry, some disadvantages still exist such as a narrow operation temperature window, low N 2 selectivity and poor stability at high temperatures, and, more importantly, the biological toxicity of the active V 2 O 5 phase, restricting its further application especially for the NO x reduction process for mobile sources such as diesel engines. [3,7,8] Therefore, more and more researchers now devote themselves to the development of new, highly efficient and environmentally friendly NH 3 -SCR catalysts with improved low-temperature deNO x efficiency, hydrothermal stability or resistance to co-existing pollutants, including zeolite catalysts promoted by metal cations (e.g., Fe-ZSM-5, Fe-BEA, Cu-ZSM-5, Cu-beta, Cu-CHA) [9][10][11][12][13][14][15][16][17][18][19][20] and single metal oxide, supported type, or mixed oxide catalysts (e.g., g-Fe 2 O 3 nanorods, Fe 2 O 3 / WO 3 /ZrO 2 , Ti 0.9 Fe 0.1 O 2Àd , Ce-P-O, CeTiO x , CeWO x , MnO x , (Fe 3Àx Mn x ) 1Àd O 4 ). [21][22][23][24][25][26][27][28][29] In our previous study, we reported a novel, environmentally benign iron titanate (FeTiO x ) catalyst for NH 3 -SCR of NO x prepared by a facile coprecipitation method, achieving high deNO x efficiency, N 2 selectivity, and H 2 O/SO 2 durability in the medium temperature range.…”

Highly dispersed iron vanadate catalyst supported on TiO2 for the selective catalytic reduction of NOx with NH3

“…The vanadium-based catalysts have also been successfully used in the deNO x process for heavy duty diesel engines in 2005 using urea as an efficient reductant [3]. However, although it has been utilized industrially for several decades, some disadvantages still remain for this catalyst system, such as a narrow operation temperature window, low N 2 selectivity, and sublimation of V 2 O 5 at high reaction temperatures [1,4,5], which greatly restrict its further application in the deNO x process for mobile sources. Accordingly, the in-depth study and improvement of vanadium-based catalysts for the NH 3 -SCR process is still of great concern in the field of environmental catalysis [5][6][7][8][9][10][11][12][13].…”

Investigation of Iron Vanadates for Simultaneous Carbon Soot Abatement and NH3-SCR

“…For this purpose, an active SCR catalyst formulation has been loaded over supports showing different soot oxidation functionalities. SCR catalyst materials were selected among metal/rare earth vanadates that have been shown to act as efficient catalyst precursors for NH 3 -SCR reaction [11][12][13][14][15][16], while among the different supports, standard TiO 2 -WO 3 -SiO 2 (TWS) was used and compared with more efficient carbon oxidation carriers like CeO 2 and Ce 0.75 Zr 0.25 O 2 [17]. In particular, this work investigates FeVO 4 and Fe 0.5 Er 0.5 VO 4 supported on TWS, CeO 2 , Ce 0.75 Zr 0.25 O 2 (CeZrO 2 ), and Al 2 O 3 in the simultaneous soot oxidation and NH 3 -SCR reactions.…”