Lithium-promoted V2O5−TiO2 catalysts for o-xylene oxidation to phthalic anhydride

Surface Species Formed after NO Adsorption and NO + O2 Coadsorption on ZrO2 and Sulfated ZrO2: An FTIR Spectroscopic Study

“…The increasing ecological requirements rouse an immense interest in selective catalytic reduction (SCR) of nitrogen oxides. This process is commercially applied with immobile NO x sources using ammonia as a reducing agent. , The most efficient catalysts are vanadia or vanadia−tungsta supported on TiO 2 . , However, efforts have been made to replace TiO 2 as a support by ZrO 2 because of the higher thermal stability of the latter. , At present, many studies are devoted to SCR of NO x by hydrocarbons (HC-SCR). This reaction has initially been reported to proceed over metal-exchanged zeolites, − but after that transition metal cations well dispersed on oxide supports have also been found to be efficient catalysts. , In particular, transition metal cations dispersed on ZrO 2 are reported to be promising HC-SCR catalysts. − More recently, a preliminary sulfatation of zirconia was found to favor the dispersion of supported metal cations which would facilitate good SCR performance .…”