Photo-assisted SCR over highly dispersed silver sub-nanoparticles in zeolite under visible light: An Operando FTIR study

Houeida Issa Hamoud , Mama Lafjah , Fatima Douma , Oleg I. Lebedev , Fatiha Djafri , Valentin Valchev (1) , Marco Daturi , Mohamad El Roz

1 LCS - Laboratoire catalyse et spectrochimie

In this study, the photo-assisted SCR-NH 3 activities of vanadium containing zeolite X (ZX-V) and Ag@ZX-V catalysts are investigated under visible-light and soft temperature conditions (RT and T = 150 °C). The highly dispersed silver was incorporated into the zeolite structure as Ag n + nano and sub-nano-clusters with small particle size (< 1 nm) using a However, at T =150 °C a significant photo-assisted SCR activity is observed under visible light irradiation with more than 18 % of additional NO x removal. The different behavior of the material at 150°C in respect to its activity at RT is mainly attributed to the additional formation of silver nanoparticles and to the possible formation and conversion of intermediates that are not formed and or converted at RT (thermodynamic limitation). Basing on this study, a possible mechanism of the photo-assisted SCR reaction is proposed.

Mots clés: Photo-assisted SCR; Silver clusters; Zeolite; Photocatalysis; Plasmon

Domaines: Chimie

Houeida Issa Hamoud, Mama Lafjah, Fatima Douma, Oleg I. Lebedev, Fatiha Djafri, et al.. Photo-assisted SCR over highly dispersed silver sub-nanoparticles in zeolite under visible light: An Operando FTIR study. Solar Energy, 2019, 189, pp.244-253. ⟨10.1016/j.solener.2019.07.020⟩. ⟨hal-03040743⟩