Characterization of NiAl and NiCuAl catalysts prepared by different methods for hydrogen production by thermo catalytic decomposition of methane

Suelves, I.; Lázaro, M.J.; Moliner, R.; Echegoyen, Yolanda; Palacios, J.M.

doi:10.1016/j.cattod.2006.05.071

Cited by 133 publications

(84 citation statements)

References 27 publications

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“…A detailed description of the experimental set up was previously reported [20]. Nickel or nickel-cobalt catalysts using Al 2 O 3 as textural promoter with Ni:Al or Ni+Co:Al molar ratio of 67:33 were prepared by the fusion method described in [21]. Following biogas designation, the as-produced BCNFs were denoted BCNF1 and BCNF2 together with CDB reaction temperature (6 for 600 ºC or 7 for 700 ºC), such as BCNF2-7 for those obtained from a CH 4 :CO 2 mixture of 60:40, at 700 ºC.…”

Section: Production and Composition Of Bcnfsmentioning

confidence: 99%

Graphitic nanomaterials from biogas-derived carbon nanofibers

Cuesta

Cameán

Ramos

et al. 2016

Fuel Processing Technology

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Carbon nanofibers with different microstructure and elemental composition that were produced in the catalytic decomposition of synthetic biogas mixtures, in a rotary-bed reactor using nickel and nickel-cobalt catalysts at 600 ºC and 700 ºC, were heat treated in the temperature interval 2600-2800 ºC to explore their ability to graphitize. The influence of treatment temperature as well as carbon nanofibers composition, particularly metallic species, on the structural and textural properties of the materials prepared is discussed. Graphitic nanomaterials with great development of the three-dimensional structure (d 002 ~ 0.3360 nm, L c ~ 48 nm, L a ~ > 100 nm) and low porosity (S BET ~ 20 m 2 g -1 ) have been achieved. Because of the catalytic effect of silicon in the presence of inherent nickel and cobalt metals, more structurally ordered materials were obtained from the carbon nanofibers by adding silica. Based on the results of this work, the utilization of biogasderived carbon nanofibers for the production of synthetic nanographite to be used in different applications, such as electrode material in energy storage devices in which both high degree of graphitic order and small surface area are required, appears feasible.

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Section: Production and Composition Of Bcnfsmentioning

confidence: 99%

Graphitic nanomaterials from biogas-derived carbon nanofibers

Cuesta

Cameán

Ramos

et al. 2016

Fuel Processing Technology

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“…Ni, Co and Fe based catalysts using Al 2 O 3 as textural promoter with an X:Al molar ratio of 67:33 (X: Ni, Co or Fe) and denoted as Ni/Al 2 O 3 , Co/Al 2 O 3 and Fe/Al 2 O 3 , were prepared by the fusion method previously described in [46]: briefly, nitric salts of the metal and aluminium were crushed, followed by calcination of the resulting mixture at 450 °C for 8h. The powder samples were grounded and sieved to particle size in the 100-200 µm range to avoid external and internal mass transfer limitations [30].…”

Section: Catalysts Synthesismentioning

confidence: 99%

Relationship between carbon morphology and catalyst deactivation in the catalytic decomposition of biogas using Ni, Co and Fe based catalysts

Llobet

Pinilla

Moliner

et al. 2015

Fuel

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A novel approach to the decomposition of biogas consisting in the simultaneous production of syngas (H 2 and CO mixture) and bio-nanostructured filamentous carbon (BNFC) is proposed. Catalysts with different active phases such as Ni, Co or Fe on Al 2 O 3 are studied in the temperature range between 600 and 900 ºC. Their behaviour was analysed considering CH 4 and CO 2 conversions, reaction rates, catalyst stability and carbon production. Additionally, the BNFC produced were characterised by transmission electron microscopy. Depending on the active phase and the reaction temperature, different carbon types were identified: fishbone, parallel and chain-like BNFC and encapsulating carbon. Large amounts of BNFC and good catalyst stability were achieved with the Ni/Al 2 O 3 catalyst at 600 ºC, pointing out that carbon accumulation is not directly responsible of catalyst deactivation and that the key factor is the nature of carbon formed during the reaction.

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“…Carbon nanofibers (CNFs) were grown by methane decomposition over a catalyst based on nickel (Ni:Cu:Al 2 O 3 ), prepared by a co-precipitation method, as described elsewhere [12]. A fixed bed reactor was used in which CNFs were grown for ten hours, an appropriate duration to obtain sufficient amount of deposited carbon without any observed deactivation.…”

Section: Synthesis Of the Carbon Materialsmentioning

confidence: 99%

Nanostructured Carbon Materials as Supports in the Preparation of Direct Methanol Fuel Cell Electrocatalysts

et al. 2013

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Different advanced nanostructured carbon materials, such as carbon nanocoils, carbon nanofibers, graphitized ordered mesoporous carbons and carbon xerogels, presenting interesting features such as high electrical conductivity and extensively developed porous structure were synthesized and used as supports in the preparation of electrocatalysts for direct methanol fuel cells (DMFCs). The main advantage of these supports is that their physical properties and surface chemistry can be tailored to adapt the carbonaceous material to the catalytic requirements. Moreover, all of them present a highly mesoporous structure, diminishing diffusion problems, and both graphitic character and surface area can be conveniently modified. In the present work, the influence of the particular features of each material on the catalytic activity and stability was analyzed. Results have been compared with those obtained for commercial catalysts supported on Vulcan XC-72R, Pt/C and PtRu/C (ETEK). Both a highly ordered graphitic and mesopore-enriched structure of these advanced nanostructured materials resulted in an improved electrochemical performance in comparison to the commercial catalysts assayed, both towards CO and alcohol oxidation.

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Characterization of NiAl and NiCuAl catalysts prepared by different methods for hydrogen production by thermo catalytic decomposition of methane

Cited by 133 publications

References 27 publications

Graphitic nanomaterials from biogas-derived carbon nanofibers

Graphitic nanomaterials from biogas-derived carbon nanofibers

Relationship between carbon morphology and catalyst deactivation in the catalytic decomposition of biogas using Ni, Co and Fe based catalysts

Nanostructured Carbon Materials as Supports in the Preparation of Direct Methanol Fuel Cell Electrocatalysts

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