Unexpected redox behaviour of large surface alumina containing highly dispersed ceria nanoclusters

Abstract

In CeO2–Al2O3 prepared by the EISA route, Ce4+ can be totally reduced into Ce3+ between 400 and 500 °C with the participation of Al2O3 in the reversible reduction process.

Highly active and stable Ni dispersed on mesoporous CeO2-Al2O3 catalysts for production of syngas by dry reforming of methane

“…The higher mobility of oxygen in the Ni-based samples prepared by EISA method is in agreement with the shift to lower temperature in the Ce reduction observed during TPR, generating more oxygen vacancies [41]. During the re-oxidation step it was not formed CO2, which is an indication of the low basicity of these samples, characteristic of CeAl material, as shown in a previous study [25].…”

“…No peaks due to CeO2 phase wereobserved for all the catalysts prepared by EISA method or impregnation. This result suggests that ceria nanoparticles are highly dispersed as nanoclusters on the large alumina surface as observed in our previous work[25].…”

“…It is reported in the literature [38] [25] showed that CexAl materials calcined at low temperature (400 °C), containing…”

“…Many researchers [22][23][24] reported its utilization as a catalyst support to promote the carbon removal mechanism. Fonseca et al [25] have synthetized CeO2-Al2O3 mesoporous materials by EISA method (with 6 to 35…”

Influência de agentes precipitantes no desempenho de catalisadores de ferro na desidrogenação do etilbenzeno

“…The precursors were obtained from the sol-gel process. This method is the most convenient alternative for producing catalysts, when compared to the traditional wet mixing technique, as it allows the mixing of components at the molecular level, leading to the formation of more homogeneous solids (Fonseca, et al, 2019).…”