title: Effects of SO2on selective catalytic reduction of NO with NH3over a TiO2photocatalyst.
abstract: The effect of SO2gas was investigated on the activity of the photo-assisted selective catalytic reduction of nitrogen monoxide (NO) with ammonia (NH3) over a TiO2photocatalyst in the presence of excess oxygen (photo-SCR). The introduction of SO2(300 ppm) greatly decreased the activity of the photo-SCR at 373 K. The increment of the reaction temperature enhanced the resistance to SO2gas, and at 553 K the conversion of NO was stable for at least 300 min of the reaction. X-ray diffraction, FTIR spectroscopy, thermogravimetry and differential thermal analysis, x-ray photoelectron spectroscopy (XPS), elemental analysis and N2adsorption measurement revealed that the ammonium sulfate species were generated after the reaction. There was a strong negative correlation between the deposition amount of the ammonium sulfate species and the specific surface area. Based on the above relationship, we concluded that the deposition of the ammonium sulfate species decreased the specific surface area by plugging the pore structure of the catalyst, and the decrease of the specific surface area resulted in the deactivation of the catalyst.
authors.affiliation: Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Yamamoto
authors.forename: Kentaro
authors.initials: K
authors.lastname: Teramura
authors.forename: Saburo
authors.initials: S
authors.lastname: Hosokawa
authors.forename: Tsunehiro
authors.initials: T
authors.lastname: Tanaka
keywords: NH3-SCR; SO2; photocatalyst