Selective Catalytic Reduction of NOx with Ammonia and Hydrocarbon Oxidation Over V2O5–MoO3/TiO2 and V2O5–WO3/TiO2 SCR Catalysts

• Published in: Topics in catalysis Vol. 62; no. 1-4; pp. 129 - 139
• Main Authors: Zheng, Lei, Casapu, Maria, Stehle, Matthias, Deutschmann, Olaf, Grunwaldt, Jan-Dierk
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-02-2019; Springer Nature B.V
• Subjects: Aldehydes; Ammonia; Catalysis; Catalysts; Catalytic activity; Chains; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Dodecane; Formaldehyde; Formulations; Hydrocarbons; Industrial Chemistry/Chemical Engineering; Molybdenum oxides; Molybdenum trioxide; Nitrogen oxides; Original Paper; Oxidation; Pharmacy; Physical Chemistry; Propylene; Selective catalytic reduction; Selectivity; Titanium dioxide; Tungsten oxides; Vanadium oxides; Vanadium pentoxide; SCR; DPF; Hydrocarbon oxidation; Molybdenum; Formaldehyde; Vanadium
• ISSN: 1022-5528; 1572-9028
• DOI: 10.1007/s11244-018-1097-9

The NH
3
-SCR performance in the presence of short and long chain hydrocarbons (propylene and dodecane) as well as of formaldehyde was investigated for a series of V
2
O
5
–MoO
3
/TiO
2
(VMoTi) and V
2
O
5
–WO
3
/TiO
2
(VWTi) catalysts. The results demonstrate that vanadium oxides act as the main catalytically active component for NO
x
conversion, hydrocarbon (HC) and formaldehyde oxidation. Among VMoTi and VWTi materials with different vanadium loading, the catalysts containing 3 wt% V
2
O
5
lead to the highest catalytic activity. The ability to simultaneously remove NO
x
, HC and HCHO over VMoTi is inferior to that of the conventional WO
3
-based catalyst. However, VMoTi exhibits higher CO
2
selectivity, especially during oxidation of long-chain HCs, which represents an important advantage for a possible multifunctional catalyst. Apart from CO, formaldehyde was detected as byproduct during HC oxidation for both catalyst formulations.