Operando Study of PtPd Nanoparticles on Al2O3 During Methane Oxidation

We plan to investigate the shape, elemental distribution, oxidation state, strain and epitaxy of a model PdPt catalyst supported on single crystalline alpha-Al2O3(0001) by high-energy surface X-ray diffraction under operando conditions. We will perform time-resolved experiments during the catalyst light-off and under steady state operation to determine sinter kinetics. Simultaneously we will monitor the catalytic activity of the particles by online mass spectroscopy. Due to the high ecological impact of gasoline and diesel fuels, natural gas and biofuel alternatives become more important than ever. However, methane, the major component of these fuels, is a greenhouse gas more potent than CO2. In addition, methane also occurs as an exhaust gas in “lean burning” conventional engines due to incomplete combustion. Hence, it is vital for the exhaust treatment in both cases to ensure full oxidation of CH4 to CO2 and water by tailored PtPd catalysts.