https://doi.org/10.1016/j.cej.2022.135394
“Among various metal oxides, e.g. Al2O3, SiO2, and TiO2, used as supports in methanation catalysis, CeO2 has drawn intensive attention due to its basic nature, high stability, and capacity for oxygen vacancy formation [29], [30]. These vacancies can directly dissociate CO2 to CO*, and thus provide a pathway to initiate and enhance CO2 conversion [8], [31], while a high affinity between surface lattice oxygen and metal atoms can stabilize guest cations, maintaining high metal dispersion on CeO2 support [32]. However, a detailed understanding of such interaction between highly dispersed metal clusters sites and CeO2 support sites is lacking, as is insight into the reaction mechanism. This absence of knowledge retards the rational design of efficient materials utilized in the ICCU process, and therefore addressing these deficiencies in knowledge is paramount.”