The Co/TiO2 catalyst with a nominal Co-loading of 10 mol-% by metal was prepared as nano powder using double-flame spray pyrolysis and sieved through a 250 µm mesh sieve to achieve homogenous agglomerate sizes as described in detail by Gäßler et al. The catalyst is characterized by N2 physisorption (BET), X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) analysis, temperatureprogrammed reduction with hydrogen (H2-TPR), and CO2 chemisorption. The results of the H2-TPR (figure ) show two reduction peaks with their respective maxima at 340 °C and 390 °C. The XRD measurements revealed a crystalline phase composition of Co3O4 (ICSD: 97004), anatase-TiO2 (ICSD: 172916) and rutile-TiO2 (ICSD: 9161) with crystallite sizes of 7.2 ± 0.2, 21.0 ± 0.3 and 10.7 ± 0.2 nm for Co3O4, a-TiO2 and r-TiO2 respectively. Further characterization results are summarized in table .