Comprehensive H2-TPR Study of the Lanthanide Oxides Reducibility
Oleksii Bezkrovnyi
Abstract
Abstract The present work focuses on the study of the interaction of rare-earth oxides (REOs: La 2 O 3 , CeO 2 , Pr 6 O 11 , Nd 2 O 3 , Sm 2 O 3 , Eu 2 O 3 , Gd 2 O 3 , Tb 4 O 7 , Dy 2 O 3 , Ho 2 O 3 , Er 2 O 3 , Tm 2 O 3 , Yb 2 O 3 , Lu 2 O 3 , and Y 2 O 3 ) with hydrogen using the H 2 -TPR technique. The temperature windows for surface and bulk H 2 -TPR peaks of all nanocrystalline rare-earth oxides were determined and discussed in detail. A comprehensive analysis of the reducibility of rare-earth oxides was also conducted. This analysis identifies the pathways and general trends of the reduction processes in nanocrystallites of all rare-earth oxides — key information for their use in a wide range of scientific applications, such as heterogeneous catalysis and luminescent materials. Graphical Abstract