FTIR study of carbon monoxide adsorption on ceria: CO 2? 2 carbonite dianion adsorbed species

Abstract

CO has been adsorbed in doses at room temperature by ceria which had been reduced with CO and then evacuated at 873 K, or only evacuated at this temperature, as well as by a Pd/CeO, catalyst, H,-reduced and evacuated at 823 K. From comparison of the observed IR spectra with literature results concerning matrixisolated Cs,CO, species, the formation of two carbonite COZspecies adsorbed over reduced ceria may be inferred. One of these species, with Czv geometry and with IR bands at around 1300 and 1160 cm-', was formed before the other one, with a C, structure and characterized by IR bands at 1270, 1071 and 771 cm-'. A band at 1465 cm-' was only tentatively assigned to a third carbonite species. COZspecies ultimately lead to C0:-

The dynamic surface chemistry during the interaction of CO with ceria captured by Raman spectroscopy

“…As well, new bands appeared at 2115 cm )1 and 1582 cm )1 , and a low-frequency shoulder formed on the 1166 cm )1 band at 1068 cm )1 . The 1068 cm )1 band has been assigned to a vibrational mode of cerium carbonate by several research groups [10,22,[24][25][26].…”

Surface sites on Pt–CeO2mixed oxide catalysts probed by CO adsorption: a synchrotron radiation photoelectron spectroscopy study

“…One possibility would be to assign the corresponding species to a surface carbonite, (CO 2 2À ), species. 24 These species have been identified on reduced ceria after CO adsorption at room temperature. 24 Finally, we assign the weak peak (E) at 285 eV to traces of atomic carbon on the ceria surface formed during preparation of the sample.…”

“…24 These species have been identified on reduced ceria after CO adsorption at room temperature. 24 Finally, we assign the weak peak (E) at 285 eV to traces of atomic carbon on the ceria surface formed during preparation of the sample. 44 This species vanishes from the surface after annealing to temperatures higher than 400 K. The intensity of this species does not increase during annealing and CO adsorption cycles, which means that CO does not dissociate on the Pt-free CeO 2 surface under the present experimental conditions.…”

“…monodentate, bidentate, tridentate, bridging, and chelating carbonates, carboxylates and carbonites. [17][18][19][20][21][22][23][24][25][26] In such cases the identification of the species and their adsorption sites is often assisted by density functional calculations. [25][26][27][28][29] In particular, interaction of CO molecules with planar CeO 2 (111), CeO 2 (110), and CeO 2 (100) surfaces 27 as well as CeO 2 particles 28 has been modelled by density functional theory (DFT).…”

Sensitivity of CO oxidation toward metal oxidation state in ceria-supported catalysts: an operando DRIFTS-MS study

“…31 The parallel development of the bands at 1028, 1300 and 1564 cm above 90-100°C (grey) and its intensity further increases with temperature. We attribute it to the formation of polydentate carbonates from the presence of CO 2 .…”