Lanthanide (III) (La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) Ions Loaded in CeO₂ Support; Fundamental Natures, Hydrogen Reduction, and CO Oxidation Activities

Abstract

The introduction of guest metal ions significantly change the nature of bare support materials. In this study lanthanide, Ln,

Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

“…Applications of rare earth-substituted ceria materials span the types of fields expected for these materials, from oxide ion conductors in solid oxide fuel cells, where the enhanced sinterability of fine powders into ceramics is beneficial [136,137,143,149,150], to catalysts for CO and soot oxidation, where the high surface and exposure of specific crystal faces may offer some benefits [103,105,107,108,113,115,132,133,135,[150][151][152][153]. Photocatalytic properties are of increasing focus for degradation of pollutants or organic transformations, and some of the rare earth-substituted materials have been screened for these applications [101,124,141,154].…”

Photocatalytic CO2 Reduction and Thermal CO Oxidation to CO2 over Cu/Ni-loaded TiO2 Photo and Thermal Catalysts

“…This indicates that the bending and stretching modes are oppositely affected by the loaded metal ions. Figure 4 displays CO oxidation profiles along with the reaction temperature obtained using two different methods: 1) CO 2 gas sensor detection and 2) temperature-programmed reaction mass spectrometry [7,11,18]. For the CO 2 gas sensor detection method, the sample temperature was increased to the desired temperature and stabilized for 30 min.…”

“…To satisfy increasing demand, considerable effort has been devoted to the designing of new catalysts with higher catalytic performance [1,[7][8][9]. Among various strategies, guest transition metal doping/loading of a host metal oxide has been extensively employed [1,7,[10][11][12][13]. For recycling energy production using CO 2 reduction, Ola and Maroto-Vale loaded Cr, V, and Co onto honeycomb monolithic TiO 2 structures, tested vaporphase CO 2 photoreduction, and observed CH 4 and acetaldehyde production rates of 4.87 and 11.13 μmol g −1 h −1 , respectively, for 0.5 wt% V TiO 2 monoliths [9].…”

Ce(OH)2Cl and lanthanide-substituted variants as precursors to redox-active CeO2materials

“…46 It is already established that Prsubstitution in ceria provides the lowest temperature reduction, amongst the lanthanides, followed by Tb-substitution. 47 It should be noted that for all materials there is no evidence for phase separation after the two cycles of TPR: powder XRD shows that the average fluorite structure is maintained in all cases (ESI †). It is also noteworthy that the surface areas of the samples show some variation, Table 2, and the poorer reducibility of the Tb-substituted oxide may in part be due to its lower surface area.…”