Structural and Catalytic Characterization of Radiation-Induced Ni/TiO2 Nanoparticles
The radiolysis route is applied to synthesize nickel catalysts deposited on titanium dioxide. The TPR profile of radiation-induced Ni/TiO2 catalyst indicates a more complete reduction of the irradiated catalysts compared to the conventionally H2-reduced one. When tested in the benzene hydrogenation, the radiolytic Ni/TiO2 exhibits catalytic properties with higher efficiency than the H2-reduced catalyst. This observation is assigned to the presence of intermetallic Ni–Ti compounds (Ni2.66Ti1.33 and Ni3Ti) evidenced by XRD. In contrast, the calcined and H2-reduced catalyst contains predominantly the oxidized Ni5TiO7 phase, where the nickel is in strong interaction with the support. The TEM observations show highly dispersed nickel.
KeywordsNanoparticles Interfacial phases Nickel Titania Radiolytic process Hydrogenation
This study has benefited of the aid of the Algerian “Fond National de la Recherche” (Project CNEPRU N° D00920100029) and National Project of Research PNR. It has been partially supported by French-Algerian cooperation (Contract “Tassili” CMEP 04 MDU 616). The authors are grateful to Patricia Beaunier, Paris 6 University for HRTEM imaging.
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