Results (
Thai) 1:
[Copy]Copied!
A series of CuZnAlCeO catalysts with Zn partially substituted by Ce were prepared by co-precipitation,and employed for hydrogen production via dimethyl ether steam reforming (DME SR). The catalyticactivity of these catalysts largely depends on CeO2 content. The catalyst containing 10 wt% CeO2 exhibitsthe best catalytic performance. The techniques of X-ray diffraction (XRD), N2O chemisorption, X-rayabsorption fine structure (XAFS, including XANES and EXAFS), temperature-programmed reduction(H2-TPR) and CO desorption (CO-TPD) were used for catalyst characterization. The results of XRD, H2-TPRand N2O chemisorption conformably indicate that partial substitution of Zn by Ce can remarkablyimprove the dispersion of Cu species. The presence of Ce could not only inhibit the sintering of Cuspecies, but also improve the reducibility of copper oxides. The CO-TPD results clearly indicate that thetwo catalysts with 5 and 10 wt% CeO2 possess higher CO-chemisorption capability than others, which isconsistent with the results of Cu dispersion. The linear fitting results of XANES spectra reveal that thesetwo catalysts also contain higher amount of Cu þ species, which determines their better catalytic performance for DME SR
Being translated, please wait..