Focus on the modified CexZr1−xO2 with the rigid benzene-muti-carboxylate ligands and its catalysis in oxidation of NO

Zr-doped CeO2 nanorods as versatile catalyst in the epoxidation of styrene with tert-butyl hydroperoxide as the oxidant

“…4, the +4 oxidation state is the main chemical valence of cerium on the surface characterized by XPS, and a small amount of +3 oxidation state also co-existed. +3 oxidation state of cerium was introduced by the spontaneous transformation of Ce 4+ (0.97 Å) to the larger Ce 3+ (1.10 Å), compensating for the lattice contraction induced by slightly smaller radius Zr 4+ (0.84 Å) [40]. The percentages of Ce 3+ to the total Ce are 8.7%, 10.6%, 14.6%, and 9.5% for the CeO 2 , Ce 0.95 Zr 0.05 O 2 , Ce 0.9 Zr 0.1 O 2 and Ce 0.8 Zr 0.2 O 2 catalysts, respectively.…”

Insights into synergistic effect of chromium oxides and ceria supported on Ti-PILC for NO oxidation and their surface species study

“…oxygen species [26]. Many studies have revealed that the enhanced mobility is advantageous to the promotion of 7 O 2 adsorption and activation [34], which is believed to be crucial for the increase of the catalytic activity. Therefore, 8…”

Influence of Ce/Zr Ratio on the Synergistic Effect over CuCe1–xZrxOy/ZSM-5 Catalysts for the Self-Sustained Combustion of Carbon Monoxide

“…(1) and (2) (Konysheva and Francis, 2013), where the [Ce 3+ ] and [Ce 4+ ] stand for the sums of the integrated peak areas related to their XPS signals respectively: As shown in Table 1, the Cu/Si, Ce/Si, and Zr/Si ratios detected by XPS are higher than those obtained from atomic absorption spectroscopy, indicating that the copper, cerium, and zirconium are enriched on the surface of ZSM-5 grains since XPS as a surface technique preferentially detects species with a sampling depth of 3-10 nm. Although the Cu/Si ratio of the bulk is maintained at about 0.025, the surface atomic ratio of Cu/Si ratio increases with cerium content, reaching the maximum of 0. , which has been claimed to be the source of a synergistic interaction between copper and cerium species (Qi et al, 2012 (Cai et al, 2014). The spontaneous transformation of Ce 4+ (rCe 4+ = 0.97 Ǻ) ion to the larger Ce 3+ (rCe 3+ = 1.10 Ǻ) could compensate for this lattice contraction.…”