Carbon Nanofibers: A Unique Catalyst Support Medium

Rodríguez, N.M.; Kim, Myung-Soo; Baker, Rose M.

doi:10.1021/j100101a003

Cited by 294 publications

(144 citation statements)

References 3 publications

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“…These include the hydrogenation of light alkenes [23][24][25][26][27], aldehydes [21,[28][29][30][31][32][33], polycyclic aromatic hydrocarbons [34], nitrobenzene [35], and cyclohexene [36]. They have also been used in alkene hydroformylation [37], vacuum residue hydroprocessing [38,39], ammonia and Fisher-Tropsch synthesis [40][41][42], cyclohexanol dehydrogenation [43], NO decomposition [44] and aniline oxidation [45,46].…”

Section: Introductionmentioning

confidence: 99%

Bio-oil upgrading in supercritical water using Ni-Co catalysts supported on carbon nanofibres

Remón

Arauzo

García

et al. 2016

Fuel Processing Technology

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This work addresses the preparation, characterisation and screening of different Ni-Co catalysts supported on carbon nanofibres (CNFs) for use in the upgrading of bio-oil in supercritical water. The aim is to improve the physicochemical properties of bio-oil so that it can be used as a fuel. The CNFs were firstly oxidised in HNO 3 and afterwards subjected to a thermal treatment to selectively modify their surface chemistry prior to the incorporation of the metal active phase (Ni-Co). The CNFs and the supported catalysts were thoroughly characterised by several techniques, which allowed a relationship to be established between the catalyst properties and the upgrading results.The use of Ni-Co/CNFs for bio-oil upgrading in supercritical water (SCW) significantly improved the properties of the original feedstock. In addition, the thermal treatment to which the fibres were subjected exerted a significant influence on their catalyticproperties. An increase in the severity of the thermal treatment led to a substantial reduction in the oxygen content of the CNFs, mainly due to the removal of the less 2 stable oxygen surface groups, which allowed their surface polarity to decrease. This decrease resulted in less formation of solid products. However, it also reduced the H/C and increased the O/C ratios of the upgraded liquid. Therefore, a compromise between the yield and the properties of the upgraded bio-oil was achieved with a Ni-Co supported on a CNF with a moderate amount of oxygen surface groups.

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Section: Introductionmentioning

confidence: 99%

Bio-oil upgrading in supercritical water using Ni-Co catalysts supported on carbon nanofibres

Remón

Arauzo

García

et al. 2016

Fuel Processing Technology

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“…There are two main reasons for this choice: (1) the open structure of CNF/SMF filters presents a low pressure drop through the reactor together with even gas-flow distribution; (2) the mesoporous morphology of the graphitic CNF ensures low mass-transfer resistance, and the high thermoconductivity of CNF/SMF Inconel allows strict temperature control during the exothermic acetylene hydrogenation. 13,19,20 Another major issue in the acetylene hydrogenation is the selectivity to ethylene, since this reaction is performed industrially to remove acetylene impurities from ethylene feedstock. 21 The control of the oligomerization of acetylene, which causes the deactivation of the catalyst by covering the metal surface with polyolefin (green-oil) [22][23][24][25][26] is also important.…”

Section: Introductionmentioning

confidence: 99%

Monodispersed Pd Nanoparticles for Acetylene Selective Hydrogenation: Particle Size and Support Effects

2008

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Monodispersed Pd nanoparticles (8, 11, and 13 nm in diameter) as confirmed by high resolution transmission electron microscopy were prepared via the reverse microemulsion method and deposited on structured supports consisting of carbon nanofibers (CNF) grown on sintered metal fibers (SMF). The CNF/SMF supports were subjected to oxidative treatments to introduce O-functional groups on the CNF surface. These groups were characterized by temperature-programmed decomposition (TPD) and X-ray photoelectron spectroscopy. The catalysts were used to study (a) the effect of Pd size and (b) the effect of the support nature on the selective acetylene hydrogenation. Antipathetic size dependence of TOF disappeared at particle size bigger than 11 nm. Initial selectivity to ethylene was found size-independent. The deactivation due to coke deposition was faster for smaller particles. The structure-sensitivity relations for the catalysts investigated are discussed in terms of "geometric" and "electronic nature" of the size effect and rationalized regarding Pd-C x phase formation which is size-dependent. Supports with increased acidity diminished the formation of coke and changed the byproduct distribution toward ethane.

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“…Furthermore, the adsorption allows further processing of the NO x accumulated in the pore structure of the adsorbent (Mochida et al 1985, Rodriguez et al 1994.…”

Section: No X Removal By Activated Carbon Fibersmentioning

confidence: 99%

Adsorption of SOX and NOX in activated viscose fibers

Plens

Monaro

Coutinho

2015

An. Acad. Bras. Ciênc.

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SO x and NO x are emissions resulting from combustion processes and are the main agents that contribute to the formation of acid rain, which causes harm to humans and the environment. Several techniques for removing these pollutants are applied in i.e. oil refineries, thermoelectric that use petroleum oils and vehicular pollution. Among these, highlight the adsorption of contaminants by the usage of activated carbon fibers and activated carbon, which are characterized by high surface area and uniform distribution of pores, providing appropriate conditions for application in processes of removing environmental contaminants. In the present work, activated viscose fibers (AVF) were prepared and applied in adsorption experiments of NO and SO 2 . The materials produced showed high values of surface area, with a predominance of micro pores with diameters in the range of 1.0 nm. The AVF had satisfactory performance in the removal of contaminants and are compatible with other synthetic fibers. Thus, the formation of active sites of carbon provides contaminants adsorption, demonstrating that carbon fibers cloth can be applied for the removal of pollutants.

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Carbon Nanofibers: A Unique Catalyst Support Medium

Cited by 294 publications

References 3 publications

Bio-oil upgrading in supercritical water using Ni-Co catalysts supported on carbon nanofibres

Bio-oil upgrading in supercritical water using Ni-Co catalysts supported on carbon nanofibres

Monodispersed Pd Nanoparticles for Acetylene Selective Hydrogenation: Particle Size and Support Effects

Adsorption of SOX and NOX in activated viscose fibers

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