Extended Data Fig. 9: Catalytic activity and characterization of PdPt@Al2O3.
From: Templated encapsulation of platinum-based catalysts promotes high-temperature stability to 1,100 °C
a, Propene combustion activity of the fresh and 1,100 °C aged metal-free alumina support. Reaction mixture: 0.15 vol.% C3H6, 3 vol.% O2, and 5 vol.% steam. Aging performed at 1,100 °C for 5 h in air with 10 vol. % steam (40 ml/min total flow). b, c, Characterization of the assynthesized and 1,100 °C aged PdPt@Al2O3: b, XPS. c, XRF. d, e, Representative HAADF-STEM image of 1,100 °C aged PdPt@Al2O3 and EDS spectrum showing no Pd or Pt detectable signal. Fe, Co, Cu, Zr and Sn normal signal from the TEM column/holder. f, XRD and g, 27Al NMR of as-synthesized and 1,100 °C aged PdPt@Al2O3.
