Song Inhak, Lee Hwangho, Jeon Se Won, Kim Taejin, Kim Do Heui
School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.
Chem Commun (Camb). 2020 Dec 21;56(98):15450-15453. doi: 10.1039/d0cc06006b. Epub 2020 Nov 25.
The involvement of Lewis and Brønsted acid sites on VO/TiO catalyst in the selective catalytic reduction of NO with NH (NH-SCR) is under debate. Here, a Li doping strategy is applied to selectively block Brønsted sites, which aims to prepare model catalysts with the same V loading but different ratios of the two acid sites. Time-resolved in situ DRIFTS observation demonstrates that the surface ammonia species pre-adsorbed on Lewis and Brønsted sites can participate equally in the reaction. Consideration of site redistribution in the early stages of the transient reaction is key to accurate measurement of the ammonia consumption rate.
