Catalyst support effects: gas-phase hydrogenation of phenol over palladium

Park, Colin; Keane, Mark A.

doi:10.1016/s0021-9797(03)00171-1

Cited by 98 publications

(68 citation statements)

References 78 publications

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“…Graphitic nature inherent to the CNF enhances the palladium activity for hydrogenation as compared to the amorphous form of activated carbon (ACF). Electron transfer between the conductive CNF support and the palladium particles, inducing electronic perturbations of the metal could explain this activity increase [22,23].…”

Section: Catalytic Performances Of Pd/cnf/smf Inconelmentioning

confidence: 99%

Palladium on carbon nanofibers grown on metallic filters as novel structured catalyst

Tribolet

Kiwi‐Minsker

2005

Catalysis Today

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A novel composite material based on carbon nanofibers (CNF) grown on sintered metal fibers (SMF Inconel ) filter was investigated for its favorable properties as catalytic support. The CNF were formed directly over the SMF Inconel by thermal (650 8C) chemical vapor deposition of ethane-hydrogen mixture. The CNF/SMF Inconel composite consists of metal fibers entangled by CNF network of microns thickness and strongly anchored to the metal surface. The properties of the CNF/SMF Inconel were controlled by the synthesis conditions. The CNF coating reduced the filter porosity and decreased the material permeability, but the pressure drop during the gas passage through the reactor remained low for CNF fraction <10%. Palladium was deposited on CNF previously activated by boiling in hydrogen peroxide. The activity and selectivity of Pd8/CNF/SMF Inconel catalysts were tested in the selective hydrogenation of acetylene and compared with Pd supported on activated carbon fibers (Pd8/ACF). The TOF was one order of magnitude higher for Pd8/CNF/SMF Inconel as compared to Pd8/ACF. This effect was attributed to a strong metal-support interaction of Pd8-nanoparticles with the graphitized CNF. The reaction was found to be structure sensitive leading to a decrease of TOF for the Pd8-particles <3 nm. #

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Section: Catalytic Performances Of Pd/cnf/smf Inconelmentioning

confidence: 99%

Palladium on carbon nanofibers grown on metallic filters as novel structured catalyst

Tribolet

Kiwi‐Minsker

2005

Catalysis Today

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“…Thus, CNF supports have been reported to induce an increase in the catalytic performance of nickel nanoparticles during hydrogenations of 1-butene, 1,3-butadiene [6] and crotonaldehyde [7]. Other reports have shown advantageous properties of CNFs catalytic supports [8][9][10].…”

Section: Introductionmentioning

confidence: 97%

Carbon nanofibers grown on metallic filters as novel catalytic materials

Tribolet

Kiwi‐Minsker

2005

Catalysis Today

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Carbon nanofibers (CNF) were synthesized on sintered metal fibers (SMF) filters of nickel and Ni-containing alloys (Inconel, stainless steel (SS)) by thermal chemical vapor deposition of ethane in the presence of hydrogen at $660 8C. The CNFs were formed directly over the SMF filters without deposition of metal particles. The catalytic active sites leading to the CNF formation were attained by oxidation-reduction of the SMF filter. The CNFs present platelet morphology as determined by X-ray diffraction and transmission electron microscopy. The CNF/ SMF composites have thin carbon layer in the microns range strongly anchored to the metal surface. The initial open structure of SMF filters is preserved. Scanning electron microscopy together with temperature programmed oxidation suggests the formation of uniform CNFs deposits on SMF Inconel with fiber's diameters in the range of 70 nm. Carbon deposits with a different nature were observed over SMF Ni and SMF ss .The CNF/SMF Inconel composites have high specific surface area due to mesopores of CNFs, high thermo-conductivity and open 3D macrostructure. This is advantageous for catalytic applications, especially during the catalysis of highly exo/endothermic reactions in reactors with structured catalytic bed. #

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“…[3,7,[17][18][19][20][21][22][23][24][25][26]. In this paper we report on the application of Co and Pd by wet-impregnation/ion-adsorption techniques on CNF, pre-treated in concentrated nitric acid.…”

Section: Introductionmentioning

confidence: 99%

TEM and XPS studies to reveal the presence of cobalt and palladium particles in the inner core of carbon nanofibers

Winter

Bezemer

Spek

et al. 2005

Carbon

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In this paper, the presence of a considerable number of Co (3-4 nm) and Pd (1-4 nm) particles in the inner tube (4-9 nm inner diameter) of carbon nanofibers is demonstrated with TEM and XPS. Oxidation of freshly grown fibers in nitric acid resulted in opening of the inner tube of the fibers and in creating adsorption sites on the internal and external surface of the fibers needed for anchoring of the metal precursors. It is demonstrated that analysis with TEM tilt series is a very powerful tool to locate the actual position of the metal particles, i.e. on the external or internal surface of the fibers. The fraction of metal present in the inner core of the fibers varied from 10-15% for Pd to 28-34% for Co, depending on the synthesis method.

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Catalyst support effects: gas-phase hydrogenation of phenol over palladium

Cited by 98 publications

References 78 publications

Palladium on carbon nanofibers grown on metallic filters as novel structured catalyst

Palladium on carbon nanofibers grown on metallic filters as novel structured catalyst

Carbon nanofibers grown on metallic filters as novel catalytic materials

TEM and XPS studies to reveal the presence of cobalt and palladium particles in the inner core of carbon nanofibers

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