Ni-exsolved PrBaMn2-xNixO6-δ-based catalysts for high performance of ethanol steam reforming

PrBaMn2O6-delta (PBMO) and PrBaMn2-xNixO6-delta (PBMNO) with exsolved Ni nanoparticles (1.25 wt.%, NiPBMNO) are prepared for the development of high- performance catalysts for ethanol steam reforming (ESR). The activity of Ni- PBMNO increases with temperature and is higher than that of PBMO. At 600 degrees C, Ni-PBMNO demonstrates an ethanol conversion above 90%, an H-2-CO yield about 80%, and a negligible amount of CH4. Both Ni-PBMNO and PBMO remain unchanged structurally in dry and wet N-2. The former adsorbs more H2O than the latter by forming hydroxyl groups in the lattice because of its higher concentration of oxygen vacancy caused by Ni exsolution, rendering a coking resistance one to two orders higher than conventional catalysts. In the ESR atmosphere, the PBMNO substrate decomposes increasingly without lowering ESR activity. The co-existence of CO2 and H2O is necessary for the decomposition that formed BaCO3 and MnO. (C) 2020 Elsevier Ltd. All rights reserved.