Abstract
A series of Co (10%)/Zn ( x%)/TiO 2 catalysts ( x=0–10%) have been prepared by conventional incipient wetness techniques. TPR, BET, Raman Spectroscopy and XRD data reveal that the presence of the Zn has a minimal effect on the properties of the Co/TiO 2 materials. XPS data reveal that the surface cobalt (and Ti) concentration does not decrease after Zn addition (0% Zn–1.95% surface Co; 5% Zn–3.45% surface Co; 10% Zn–2.05% surface Co) suggesting that the Co covers the Zn ions on the TiO 2 surface. At high Zn coverage, the reducibility of the Co increases slightly. Fischer–Tropsch synthesis performed on Co (10%)/Zn ( x%)/TiO 2 ( x=0, 5 and 10%) reveals that the Zn enhances the Co activity, but changes the selectivity to lower mass hydrocarbons. The 5% Zn catalyst shows optimal methane production relative to the other two catalysts.
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