Hydrogenation of crotonaldehyde over graphite nanofiber supported nickel

Salman, Fırat; Park, C; Baker, Rose M.

doi:10.1016/s0920-5861(99)00132-7

“…Preferential blocking of either the armchair or the zigzag graphitic edge faces with P or B, respectively, indicated that the effects could be ascribed to the catalytic action of Ni residing on the zigzag faces (10). Similar effects were found when the hydrogenation of crotonaldehyde on Ni/CNF was studied (11). The nanofibre-supported catalysts were more active than Ni/Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 66%

Preparation and Activity of Small Rhodium Metal Particles on Fishbone Carbon Nanofibres

Ros

¹

2002

Journal of Catalysis

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A number of different impregnation and ion-exchange procedures have been employed to synthesize very small rhodium metal particles on HNO 3 /H 2 SO 4 -oxidized fishbone carbon nanofibres. The surface-oxidation of the nanofibres with HNO 3 /H 2 SO 4 is a prerequisite for a good interaction between aqueous catalyst precursor solutions and the fibres. Depending upon the preparation technique applied and using 1 wt% rhodium metal loadings average particle sizes ranging from 1.1 to 2.1 nm were detected with XAFS spectroscopy. The rhodium metal particles are so small that metalsupport interactions on carbon nanofibres can be investigated with XAFS spectroscopy. All catalysts are highly active in the liquidphase hydrogenation of cyclohexene. No significant effect of particle size on the catalytic activity is observed, suggesting that other factors, such as clustering of the support particles in the liquid phase, are much more important. c 2002 Elsevier Science (USA)

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“…Furthermore, with particles of this size, metalsupport interactions can be studied. Several researchers found increased activities or selectivities when carbon nanofibres or nanotubes were used as the support (7)(8)(9)(10)(11)(12)(13). More information about the interaction between the metal and the CNF support could shed some light on these phenomena.…”

Section: Preparation Of Small Rhodium Particles On Surface-oxidized Cmentioning

confidence: 99%

“…The metal and support of the catalyst originally used to grow the CNFs, however, have to be removed after synthesis. Investigation of use of carbon nanotubes and carbon nanofibres as catalyst support has only started recently (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). Carbon nanotubes are mostly used to study the effects of this novel carbon material on the properties of the final supported catalyst.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Activity of Small Rhodium Metal Particles on Fishbone Carbon Nanofibres

Ros

¹

,

Keller

²

,

Dillen

³

et al. 2002

Journal of Catalysis

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A number of different impregnation and ion-exchange procedures have been employed to synthesize very small rhodium metal particles on HNO 3 /H 2 SO 4 -oxidized fishbone carbon nanofibres. The surface-oxidation of the nanofibres with HNO 3 /H 2 SO 4 is a prerequisite for a good interaction between aqueous catalyst precursor solutions and the fibres. Depending upon the preparation technique applied and using 1 wt% rhodium metal loadings average particle sizes ranging from 1.1 to 2.1 nm were detected with XAFS spectroscopy. The rhodium metal particles are so small that metalsupport interactions on carbon nanofibres can be investigated with XAFS spectroscopy. All catalysts are highly active in the liquidphase hydrogenation of cyclohexene. No significant effect of particle size on the catalytic activity is observed, suggesting that other factors, such as clustering of the support particles in the liquid phase, are much more important. c 2002 Elsevier Science (USA)

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“…The exposed surface of the carbon nanofibers mainly consists of prismatic planes with high surface reactivity when compared to the graphite basal planes of the carbon nanotubes. Among the different potential applications of these materials, catalysis either within the gas or the liquid phase seems to be the most promising according to the results recently reported in literature (Salman et al, 1999). Metals supported on carbon nanofibers or nanotubes exhibit unusual catalytic activity and selectivity patterns when compared to those encountered with traditional catalyst supports such as alumina, silica or activated carbon.…”

Section: Introductionmentioning

confidence: 99%