Cerium, manganese and cerium/manganese ceramic monolithic catalysts. Study of VOCs and PM removal

COLMAN LERNER ESTEBAN; M. PELUSO; JORGE E. SAMBETH; HORACIO J. THOMAS

JOURNAL OF RARE EARTHS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 34 p. 675 - 682

1002-0721

Abstract: Ceramic supported cerium, manganese and cerium-manganese catalysts were prepared by direct impregnation of aqueousprecursor, and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller method(BET), temperature programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS) acidity measurements and electricalconductivity. The catalytic activity was evaluated for volatile organic compounds (VOC) (ethanol, methyl ethyl ketone and toluene)oxidation. Additionally, catalysts were tested in particulate matter (PM) combustion. The characterization results indicated that Cewas in the form of Ce4+ and Ce3+, and Mn existed in the form of Mn4+ and Mn3+ on the surface of the Mn/AC sample and in the formof Mn4+ in the Ce/Mn/AC monolith. VOC oxidation results revealed that the Ce/Mn/AC sample showed an excellent performancecompared with ceramic supported CeO2 (Ce/AC) and MnOx (Mn/AC) samples. The PM combustion was also higher on Ce/Mn/ACmonoliths. The enhanced catalytic activity was mainly attributed to the Ce and Mn interaction which enhanced the acidity, conductivityand the reducibility of the oxides.