Reaction of propane + NO + oxygen over PtRh was investigated using proton-conductive Sn0.9In0.1P2O7 (SIPO), Sn0.95Al0.05P2O7 (SAPO), Sn0.9Mg0.1P2O7 (SMPO), and Fe0.5Nb0.5P2O7 (FNPO) materials as catalyst supports. The proton conductor-supported PtRh catalysts (0.01 wt % Pt content and 0.005 wt % Rh content) showed significantly different activities; temperatures at which propane oxidation achieved 50% conversion (T50%) were 313, 330, 405, and 550 °C for Pt-Rh/FNPO, Pt-Rh/SIPO, Pt-Rh/SAPO, and Pt-Rh/SMPO, respectively; T50 % values for NO reduction were 330, 386, 465, and greater than 600 °C for Pt-Rh/FNPO, Pt-Rh/SIPO, Pt-Rh/SAPO, and Pt-Rh/SMPO, respectively. A similar tendency was also seen for the dependence of catalytic activity on space velocity. Only small differences in BET surface area and particle size were observed among FNPO, SIPO, SAPO, and SMPO. In addition, the dispersion state of PtRh was similar among the impregnated catalysts. Conversely, proton conductivity of these catalyst supports decreased in the order FNPO > SIPO > SAPO > SMPO. In particular, protons were most strictly restricted to the lattice oxide ions in SMPO. On the basis of these results, the catalytic activity of PtRh/proton conductors was correlated with proton conduction in the bulk of the catalyst supports.
Proton-conductor-supported ultra-low loading Pt-Rh three-way catalysts
Dreiwegekatalysator mit ultraniedrigem Pt-Rh-Gehalt auf protonenleitendem Träger
Journal of Physical Chemistry C ; 117 , 4 ; 1827-1832
2013
6 Seiten, 6 Bilder, 3 Tabellen, 22 Quellen
Aufsatz (Zeitschrift)
Englisch
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