Abstract
Abstract Several monometallic and bimetallic nanowires of transition metals were synthesized by a photoreduction method using mesoporous silicas FSM-16 and HMM-1 as templates. The metal nanowires were characterized by physicochemical methods such as TEM, XRD, XAFS, XPS, IR, and gas adsorption. Mechanism for formation of Pt nanowires is discussed in terms of relative rates of migration and reduction of Pt ions in the one-dimensional channels. Dissolving silica matrix with HF gave unsupported nanowires, and in the presence of surfactants or ligands the nanowires were stabilized in solutions. The catalytic performances of Pt nanowires and nanoparticles in FSM-16 were studied in water-gas-shift reaction and hydrogenolysis of butane. It is noteworthy that Pt nanowire/FSM-16 shows higher activities than Pt nanoparticle/FSM-16 in both the reactions.
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