470641 Precise Deposition of Pt Promoter Onto Silica Supported Cobalt for Fischer-Tropsch Synthesis
In this study, we demonstrate that such a selective deposition is possible. We first employ a variation of “strong electrostatic adsorption” to synthesize silica supported cobalt oxide nanoparticles of the optimum size. Second, Pt is steered onto the cobalt oxide by controlling the impregnation pH. We compare this sample to a Pt/Co catalyst prepared by the common, undirected method of co-impregnation of Pt and Co. In both methods, with fixed 10wt% of cobalt and varying 1 to 0.03 wt% of Pt, samples were characterized by XRD, TPR, and STEM.
The catalysts were tested at conventional Fischer-Tropsch conditions of 220oC and 20 bar with H2/CO ratio 2:1. The reactivity of the catalysts clearly depends on the preparation method, which can be attributed to the intimate coordination of Pt with Co. It is suggested that hydrogen spillover effects not only Co oxide reduction but also extends to the Fischer-Tropsch reaction itself.
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