Table 2.

Summary of the experimental results of three different systems studied in this work

System	Sample	SSA (m2/g)	f R	d A (nm)	d R (nm)	R 0/R at 300 °C, 3000 ppm H2	Figure
Undoped TiO2	As-obtained	67.7	0.07	20	16	4	1
	Annealed at 700 °C	–	0.75	37	57	10
TiO2:5 at.% Cr	Mostly anatase	126.6	0.16	9	8	3	2
	Mostly rutile	102.9	0.77	12	11	12
TiO2-SnO2	TiO2	57	0.05	25	9	2	3
	10% SnO2	60	0.73	28	14	8.5