Table 2. X-ray Photoelectron Spectroscopy Results with Surface Atomic Ratios of Both Catalysts after Different Reduction Temperatures.
a
Quantitative analysis was done by measuring the peak areas of the Fe2p, Si2p, and Ti2p core lines and by applying appropriate atomic sensitivity factors in the survey scans. The estimated error of the surface atomic ratios was ±0.01 at/at for Fe/Si and ± 0.03 at/at for Fe/Ti.
b
Schematic representations were based on XPS, STEM-EDX, TEM, and Mössbauer data.