Fig. 3: In-situ QXANES characterization and AP-XPS spectroscopy of 4%Ni-4nm/γ-Mo2N catalyst treated at different temperature.
From: Reversing sintering effect of Ni particles on γ-Mo2N via strong metal support interaction
a The QXANES spectra of 4%Ni-4nm/γ-Mo2N catalyst from room temperature to 590 °C, the right panel of a is a comparison of Ni K edge of 4%Ni-4nm/γ-Mo2N catalyst at state of fresh, reduced at 400 °C, 480 °C, and 590 °C to Ni foil and NiO. b AP-XPS profiles of Ni 2p, N 1s + Mo 3p and Mo 3d of 4%Ni-4nm/γ-Mo2N catalyst. The fresh sample was activated in the AP-XPS chamber by a 40 mTorr N2/H2 (1:3 v/v) mixture at 300, 350, 400, 500, and 520 °C for 1 h. The spectra at the Ni 2p, Mo 3d/3p, N 1s, and C 1s XPS regions were collected at each temperature after an hour treatment. The C 1s photoemission line with the surface carbon feature (284.8 eV) was used for the binding energy calibration.
