Table 2. Percentages of different iron species calculated from the deconvolution of UV-visible absorbance spectra of FeZ-DR and FeZ-CA.

	Fea		Feb		Fec		Fed
Catalyst	Center (nm)	Area (%)	Center (nm)	Area (%)	Center (nm)	Area (%)	Center (nm)	Area (%)
FeZ-DR	225	57	301	25	410	18	-	-
FeZ-DRe	226	52	300	29	406	19	-	-
FeZ-CA	220	42	300	22	410	24	521	12
FeZ-CAe	221	40	305	24	411	24	522	12

Notes:

^aIsolated iron species in tetrahedral coordination.

^bIsolated and oligonuclear Fe clusters.

^cLarge Fe clusters.

^dLarger Fe_xO_y particles.

^eThe sample treated at 500°C in He.