The role of platinum on the NO_x storage and desorption behavior of ceria: an online FT-IR study combined with in situ Raman and UV-vis spectroscopy

Abstract

Elucidating the role of platinum on NOx storage/desorption behavior of ceria by online gas-phase analysis combined with in situ spectroscopy.

Mechanism of the Periodic Unsteady-State Water–Gas Shift Reaction on Highly Dispersed Cu-Loaded CeO2 Catalysts

“…Difference spectra with respect to the spectrum of the preoxidized Cu(1)/CeO 2 are shown in Figure B, and formation rates of CO 2 and H 2 are plotted in Figure C. Exposure of the preoxidized Cu(1)/CeO 2 to CO resulted in CO 2 formation, accompanied by the appearance of broad absorption bands in the band range of 400–800 nm, which were assigned to the Ce 3+ –□–M ( n –1)+ species (hereafter denoted as Ce 3+ –□) on CeO 2 . ,− Considering that the band appears under reductive conditions, the contribution of the d–d transition of the Cu­(II) species to the bands is unlikely. After He purging, exposure of the reduced catalyst to H 2 O resulted in the formation of H 2 and CO 2 , accompanied by the disappearance of the bands due to the Ce 3+ –□ species.…”

Oxygen vacancies enhance the photocatalytic deep oxidation of NO over an N-doped KNbO3 catalyst

“…To effectively remove NO x , many technologies and methods have been explored and developed. 9,10 Among them, the photocatalytic oxidation of NO technology is considered to be the simplest, most effective and most environmentally friendly technology. 11,12…”