Oxidation Kinetics of Nanocrystalline Hexagonal RMn_1-xTi_xO₃ (R = Ho, Dy).

ABSTRACT: Hexagonal manganites, RMnO₃ (R = Sc, Y, Ho-Lu), are potential oxygen storage materials for air separation due to their reversible oxygen storage and release properties. Their outstanding ability to absorb and release oxygen at relatively low temperatures of 250-400 °C holds promise of saving energy compared to current industrial methods. Unfortunately, the low temperature of operation also implies slow kinetics of oxygen exchange in these materials, which would make them inefficient in applications such as chemical looping air separation. Here, we show that the oxidation kinetics of RMnO₃ can be improved through Ti⁴⁺-doping as well as by increasing the rare earth cation size. The rate of oxygen absorption of nanocrystalline RMn_1-xTi

SUBMITTER: Danmo FH 

PROVIDER: S-EPMC10510046 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature