New route to CeO2/LaCoO3 with high oxygen mobility for total benzene oxidation

Electrospun LaCoO 3 and Ce(NO 3 ) 3 ·6H 2 O were used as precursors to synthesize CeO 2 /LaCoO 3 (SSI-LaCoCe) with high oxygen mobility by solid state impregnation. Besides, electrospinning and ball milling technologies were also adopted to prepare the other two La-Co-Ce oxides, which are denoted as ES-LaCoCe and BM-LaCoCe, respectively. The catalysts were evaluated for total benzene oxidation in comparison with bare electrospun LaCoO 3 and CeO 2 , and characterized by means of O 2 -TPSR, XRD, BET, TEM, H 2 -TPR, O 2 -TPD, and XPS. Relative to LaCoO 3 , an enhanced catalytic performance can be obtained for La-Co-Ce oxides. Importantly, the concentration of surface adsorbed oxygen species from the highest to the lowest is SSI-LaCoCe > BM-LaCoCe > ES-LaCoCe, which is in good agreement with the order of catalytic activity in terms of T 50 . The high oxygen mobility in SSI-LaCoCe can be connected with sufficient interaction between active LaCoO 3 and CeO 2 . On the other hand, O 2 -TPSR analysis match well with the catalytic behaviors of La-Co-Ce oxides. Moreover, the catalyst with the best performance, SSI-LaCoCe, also represents good thermal stability during the long-term continuous test.