Effect of Ce and Au addition on MnOx catalysts. Study of CO elimination.

MIGUEL A. PELUSO, WILLINTON Y. HERNÁNDEZ, MARÍA ISABEL DOMINGUEZ, JORGE E. SAMBETH, HORACIO J. THOMAS, MIGUEL A. CENTENO.

LATIN AMERICAN APPLIED RESEARCH

PLAPIQUI(UNS-CONICET)

Lugar: Bahia Blanca; Año: 2011

0327-0793

The effect of cerium and/or gold addition to a manganese oxide which was greatly active in CO oxidationwas studied. The catalysts obtained by this way were characterized by N2 adsorption, XRF, XRD and TPR,and their catalytic activity was measured in the CO oxidation reaction. The pure MnOx catalyst was activein the CO oxidation but the addition of 5 wt % cerium decreased their catalytic activity. Adding 2 wt % goldimproved the activity of MnOx and Ce/MnOx and caused a slight decrease of the catalyst specific area andof the average oxidation state of manganese in catalysts, which was found between 3.3 and 3.6. The orderof activity found on the basis of T50 for the four catalystswas: Au/MnOx > Au/Ce/MnOx > MnOx > Ce/MnOx,with T50 of 89, 95, 99 and 139 ºC, respectively. The solids Au/MnOx and Au/Ce/MnOx presented a T10 of 30and 49 ºC, indicating that gold favored the conversion at room temperature. The effect of water vapor on thereaction was also analyzed, finding a decrease in the catalytic activity of all catalysts, due to the blocking ofactive sites in the catalyst surface.