Fig. 7. (a) XANES spectra of pure Ru-species (solid coloured lines) extracted by MCR-ALS plotted together with the reference spectra of RuBr3, [RuBr2(CO)3]2, and Ru foil (dashed red, green and blue lines respectively). (b) Concentration profiles of the three Ru-species extracted from MCR-ALS. (c) A list of experimental conditions applied during in situ XAS data collection. Conditions were varied within the described boundary conditions (see ESI,† “boundary conditions”): CO (0–5 bar), H2 (0–30 bar) and temperature (180–220 °C). Dashed lines indicate when the sample was changed. aA high concentration of RuBr3 was used, with 68 mg RuBr3 in 2 g IL. bFor all other entries, low concentrations of Ru were measured (13.6 mg in 2 g IL, similar to catalytic results presented in Table 1). cFormaldehyde (100 μL) was thermally decomposed to generate in situ CO gas. dIsopropanol (IPA, 250 μL) was added as propene precursor.
