It is highly beneficial develop new methods for synthesis of supported catalysts where particle size can be finely tuned to optimize their selectivity and activity for a range of reactions. In this work, we develop a very promising approach to synthesis of size-controlled Rh nanoparticles by doping-segregation method. More specifically it based on using Rh doped SrTiO<sub>3</sub> as the first step of nanoparticle synthesis, followed by controlled segregation of Rh induced by thermal treatment. The segregation behavior of Rh dopant was studied by various in-situ characterization techniques including environmental TEM, complemented by such in-situ techniques as XAFS, XRD and DRIFTS. More specifically, we investigated the effect of such conditions as reduction temperature on the size of Rh nanoparticles, which critical to exercise the size control of Rh nanoparticles. We then applied this method to prepare very active and selective catalysts for CO2 reduction by reverse water gas shifts reaction.

Controlling size of Rh nanoparticles produced by doping-segregation method and tuning them for catalytic CO2 conversion

254th National Meeting (2017)

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