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Promoting effect of Rh on the activity and stability of Pt-based methane combustion catalyst in microreactors

: Neuberg, Stefan; Pennemann, Helmut; Shanmugam, Vetrivel; Zapf, Ralf; Kolb, Gunther

Volltext ()

Catalysis communications 149 (2021), Art. 106202, 5 S.
ISSN: 1566-7367
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IMM ()
methane; combustion; platinum; rhodium; bimetallic; catalytic stability

For the combustion of methane, a partial replacement of platinum by rhodium leads to a significantly improved light-off behavior of the corresponding mixed Pt-Rh/γ-Al2O3 catalysts compared to a catalyst containing only Pt supported on γ-Al2O3. For all Pt-Rh/γ-Al2O3 catalysts, mixed Ptsingle bondRh crystals of low particle size were found. At 600 °C, the stability of catalysts, was found to increase with increasing rhodium content. The crystal size was determined by HR-TEM for spent catalyst samples after 40 h stability test. The samples containing higher amounts of rhodium showed smaller crystal size suggesting this as the origin of the increased catalyst stability.