Alumina-supported iron oxide nanoparticles as Fischer–Tropsch catalysts: Effect of particle size of iron oxide

Park, Jo-Yong; Lee, Yun-Jo; Khanna, Pawan K.; Jun, Ki‐Won; Bae, Jong Wook; Kim, Young Ho

doi:10.1016/j.molcata.2010.03.025

Cited by 200 publications

(114 citation statements)

References 29 publications

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“…This result could be explained in terms of that the reduction process Fe 3 O 4  FeO  Fe took place continuously, as it has been reported elsewhere [27].…”

Section: Oxygen Carrier Reducibilitysupporting

confidence: 78%

Performance of a highly reactive impregnated Fe2O3/Al2O3 oxygen carrier with CH4 and H2S in a 500Wth CLC unit

Cabello

Dueso

Garcı́a-Labiano

et al. 2014

Fuel

103

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A synthetic Fe-based oxygen carrier prepared by impregnation using -Al 2 O 3 as support, successfully tested for gas CLC combustion, has been now evaluated with respect to gas combustion in a 500 W th CLC continuous unit when the fuel, CH 4 , contained variable amounts of H 2 S.Full gas combustion was reached at oxygen carrier-to-fuel ratio values higher than 1.5. The presence of sulfur in the fuel gas hardly affected the reactivity and combustion efficiency of the oxygen carrier, independently of the amount of sulfur in the gas stream. All the sulfur introduced as H 2 S in the fuel reactor (FR) was released in the same reactor as SO 2 . Furthermore, oxygen carrier particles extracted from the CLC unit after the experimental tests with H 2 S addition were 3 characterized by means of different techniques and no sulfur was detected in any case. The impregnated Fe-based oxygen carrier was highly reactive and sulfur resistant, and can be considered as a suitable material for CLC with gaseous fuels that contain sulfur.

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“…This result could be explained in terms of that the reduction process Fe 3 O 4  FeO  Fe took place continuously, as it has been reported elsewhere [27].…”

Section: Oxygen Carrier Reducibilitysupporting

confidence: 78%

Performance of a highly reactive impregnated Fe2O3/Al2O3 oxygen carrier with CH4 and H2S in a 500Wth CLC unit

Cabello

Dueso

Garcı́a-Labiano

et al. 2014

Fuel

103

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show abstract

“…TPR results in Figure 4 show that the iron catalyst produces a broad peak at 450°C, with a further series of peaks at temperatures between 700 and 850°C. The reduction of iron oxide supported on alumina is complex and occurs in a number of stages [54][55][56]. Park et al report that a first peak between 400 and 560 °C is related to the conversion of Fe 2 O 3 into Fe 3 O 4 , which subsequently is reduced into FeO and Fe metal at 600-800°C [56].…”

Section: Iron Aluminamentioning

confidence: 99%

“…The reduction of iron oxide supported on alumina is complex and occurs in a number of stages [54][55][56]. Park et al report that a first peak between 400 and 560 °C is related to the conversion of Fe 2 O 3 into Fe 3 O 4 , which subsequently is reduced into FeO and Fe metal at 600-800°C [56]. As such, the first peak observed in TPR represents the first stage of reduction into Fe 3 O 4 , whilst further peaks represent the subsequent reduction to and Fe.…”

Section: Iron Aluminamentioning

confidence: 99%

The use of different metal catalysts for the simultaneous production of carbon nanotubes and hydrogen from pyrolysis of plastic feedstocks

Acomb

Williams

2016

Applied Catalysis B: Environmental

229

120

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Nickel, iron, cobalt and copper catalysts were prepared by impregnation and used to produce carbon nanotubes and hydrogen gas from a LDPE feedstock. A two stage catalytic pyrolysis process was used to enable large yields of both products. Plastics samples were pyrolysed in nitrogen at 600°C, before the evolved gases were passed to a second stage and allowed to deposit carbon onto the catalyst at a temperature of 800°C. Carbon nanotubes were successfully generated on nickel, iron and cobalt but were barely observed on the copper catalyst. Iron and nickel catalysts gave the largest yield of both hydrogen and carbon nanotubes as a result of metal-support interactions which were neither too strong, like cobalts, nor too weak like copper. These metal support interactions proved a key factor in CNT production. A nickel catalyst with a weaker interaction was prepared using a lower calcination temperature. Yields of both carbon nanotubes and hydrogen gas were lower on the Ni-catalyst prepared at the lower calcination temperature, as a result of sintering of the nickel particles. In addition, the catalyst prepared at a lower calcination temperature produced metal particles which were too large for CNT growth, producing amorphous carbons which deactivate the catalyst instead. Overall the iron catalyst gave the largest yield of CNTs, which is attributed to both its good metal-support interactions and irons large carbon solubility.

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“…have reasonably strong interaction with the surfaces of meso-MgO support thus suppressing the reduction of the particles that are limited to mesoporous material. In contrast, the big particles have less contact area with the support, consequently resulting in more reduction of NiO to Ni [26,27]. The calculated reduction degrees of Ni species are listed in Table 2.…”

Section: Tpr Test Of Catalyst Precursorsmentioning

confidence: 99%

Significantly Improved Catalytic Performance of Ni-Based MgO Catalyst in Steam Reforming of Phenol by Inducing Mesostructure

Yang

Wang

2015

Catalysts

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Abstract:A Ni/meso-MgO catalyst with high surface area and small Ni nanoparticles was synthesized and investigated for hydrogen production by steam reforming of phenol for the first time. Compared to conventional Ni/MgO, the Ni/meso-MgO catalyst showed higher catalytic activity and stability. X-ray Diffraction, N2 adsorption, hydrogen temperature programmed reduction, transmission electron microscopy and thermal gravimetry results indicated that the Ni/meso-MgO catalyst had higher surface area than Ni/MgO and Ni particles of Ni/meso-MgO were narrowly distributed in the range of 5~6 nm with an average size of 5.3 nm, while Ni particles of Ni/MgO were in the range of 6~10 nm with an average size of 7.92 nm. The small and uniform Ni nanoparticles in Ni/meso-MgO were attributed to the high surface area and the confinement effect of the mesoporous structure of meso-MgO, which could effectively limit the growth of the active metal and stabilize Ni particles during the procedure of NiO reduction. The mesoporous structure of Ni/meso-MgO also played an important role in suppressing Ni nanoparticle sintering and carbon deposition during the steam reforming of phenol reaction.

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Alumina-supported iron oxide nanoparticles as Fischer–Tropsch catalysts: Effect of particle size of iron oxide

Cited by 200 publications

References 29 publications

Performance of a highly reactive impregnated Fe2O3/Al2O3 oxygen carrier with CH4 and H2S in a 500Wth CLC unit

Performance of a highly reactive impregnated Fe2O3/Al2O3 oxygen carrier with CH4 and H2S in a 500Wth CLC unit

The use of different metal catalysts for the simultaneous production of carbon nanotubes and hydrogen from pyrolysis of plastic feedstocks

Significantly Improved Catalytic Performance of Ni-Based MgO Catalyst in Steam Reforming of Phenol by Inducing Mesostructure

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