PM reduction over vanadium SCR

Feiling, Alexander; Beidl, Christian

doi:10.1007/978-3-658-19012-5_7

Cited by 1 publication

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Catalytic performance was determined in a steady-state regime in a quartz tube plug flow reactor (ID 8 mm) and both the setup and some catalytic results have been reported in ref. 38 In brief, 250 mg sieved catalyst (150-300 μm) were mixed 250 mg SiO2 (150-300 μm) for dilution to gain a total bed length of 10 mm. The gas hourly space velocity (GHSV, calculated with regards to the catalyst bed with SiO2) was kept at 50 000 h -1 .…”

Section: Catalysismentioning

confidence: 99%

NH₃-SCR over V–W/TiO₂ Investigated by Operando X-ray Absorption and Emission Spectroscopy

et al. 2019

View full text Add to dashboard Cite

V-W/TiO2 based catalysts, which are used for the removal of NOx from the exhaust of diesel engines and stationary sources via Selective Catalytic Reduction with NH3 (NH3-SCR), were studied by operando X-ray absorption spectroscopy and emerging photon-in/photon-out techniques. In order to minimize the influence of highly X-ray absorbing tungsten and the fluorescence of titanium we used a high energy resolution fluorescence setup that is able to separate efficiently the V Kβ1,3 emission lines and additionally allows to record valence-to-core (vtc) X-ray emission lines. The High Energy Resolution Fluorescence Detected X-ray Absorption Spectroscopy (HERFD-XAS) and vtc X-ray Emission Spectroscopy (vtc-XES) proved to be the only way to perform operando V K edge X-ray spectroscopic study on industrially relevant V-W/TiO2 catalysts so far. The V-W/TiO2 and V/TiO2 samples were synthesized by incipient wetness impregnation and grafting and exhibit high activity towards NH3-SCR. Raman spectroscopy showed that they mainly contained highly dispersed, isolated and polymeric V-oxo species. HERFD-XAS and XES identified redox cycling of vanadium species between V 4+ and V 5+. However, no direct chemical bond between V and N was observed. As result of the obtained information we suggest that the primary role of V species in SCR is to provide redox sites, whereas, adsorption and reaction of NOx and NHx species may occur via the neighboring O atoms or on the acidic support.

show abstract

Section: Catalysismentioning

confidence: 99%

NH₃-SCR over V–W/TiO₂ Investigated by Operando X-ray Absorption and Emission Spectroscopy

et al. 2019

View full text Add to dashboard Cite

show abstract

PM reduction over vanadium SCR

Cited by 1 publication

References 16 publications

NH₃-SCR over V–W/TiO₂ Investigated by Operando X-ray Absorption and Emission Spectroscopy

NH₃-SCR over V–W/TiO₂ Investigated by Operando X-ray Absorption and Emission Spectroscopy

Contact Info

Product

Resources

About

PM reduction over vanadium SCR

Cited by 1 publication

References 16 publications

NH3-SCR over V–W/TiO2 Investigated by Operando X-ray Absorption and Emission Spectroscopy

NH3-SCR over V–W/TiO2 Investigated by Operando X-ray Absorption and Emission Spectroscopy

Contact Info

Product

Resources

About

NH₃-SCR over V–W/TiO₂ Investigated by Operando X-ray Absorption and Emission Spectroscopy

NH₃-SCR over V–W/TiO₂ Investigated by Operando X-ray Absorption and Emission Spectroscopy