Fe catalysts for methane decomposition to produce hydrogen and carbon nano materials

Lu, Zhou; Reddy, E. Linga; Harb, Moussab; Saih, Youssef; Aguilar‐Tapia, Antonio; Ould‐Chikh, Samy; Hazemann, Jean‐Louis; Li, Jun; Wei, Nini; Gary, Daniel; Del‐Gallo, Pascal; Basset, Jean‐Marie

doi:10.1016/j.apcatb.2017.02.052

Cited by 223 publications

(112 citation statements)

References 79 publications

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“…In this way, the development of catalysts that moderate the operating temperature of the endothermic methane decomposition process (CH 4 (g) → C (s) + 2H 2 (g), ∆H 0 = 75.6 kJ·mol −1 ) and at the same time promote the formation of carbon nanofilaments such as carbon nanotubes (CNT) and nanofibers (CNF) is of paramount importance. Transition metals, and more specifically Ni, Co, and Fe, offer high solubility and carbon diffusion through their crystalline structure [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

2018

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The catalytic decomposition of methane (CDM) process produces hydrogen in a single stage and avoids CO 2 emission thanks to the formation of high added value carbon nanofilaments as a by-product. In this work, Ni monometallic and Ni-Co, Ni-Cu, and Ni-Fe bimetallic catalysts are tested in the CDM reaction for the obtention of fishbone carbon nanofibers (CNF). Catalysts, in which Al 2 O 3 is used as textural promoter in their formulation, are based on Ni as main active phase for the carbon formation and on Co, Cu, or Fe as dopants in order to obtain alloys with improved catalytic behaviour. Characterization of bimetallic catalysts showed the formation of particles of Ni alloys with a bimodal size distribution. For the doping content studied (5 mol. %), only Cu formed an alloy with a lattice constant high enough to be able to favor the carbon diffusion through the catalytic particle against surface diffusion, resulting in higher carbon formations, longer activity times, and activity at 750 • C; whereas Ni, Ni-Co, and Ni-Fe catalysts were inactive. On the other hand, Fe also improved the undoped catalyst performance presenting a higher carbon formation at 700 • C and the obtention of narrow carbon nanofilaments from active Ni 3 Fe crystallites.

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Section: Introductionmentioning

confidence: 99%

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

2018

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“…very interesting catalytic formulation. The formation of cobalt carbide CoC2 may then complicate the regeneration of metal catalysts (Figure 1), as reported in the literature [52]. Figures 6-8 present, respectively, the evolution with time on stream (TOS) of H2 yield and the coproduced carbon on SP-(90, 180, 360, 720 min) samples.…”

Section: Catalysts Behavior Under Cmd-regeneration Cyclesmentioning

confidence: 56%

“…Zhou et al conducted an Fe catalyst for CMD and investigated the effect of space velocity on the methane conversion. When a space velocity (3750 mL/g-cat/h), close to the one used in the present work (5000 mL/g-cat/h), was considered, they found a methane conversion of about 38% [52]. Figure 6 compared the evolution, with time of stream (TOS), of the methane conversion obtained over the fresh catalyst and the spent catalysts subjected to successive cycles of CMD/regeneration.…”

Section: Catalysts Behavior Under Cmd-regeneration Cyclesmentioning

confidence: 62%

“…Through this study's experiments, the authors were able to verify that significant catalyst deactivation occurred toward higher regeneration times (involving a succession of cycles) despite a very interesting catalytic formulation. The formation of cobalt carbide CoC 2 may then complicate the regeneration of metal catalysts (Figure 1), as reported in the literature [52]. very interesting catalytic formulation.…”

Section: Catalysts Behavior Under Cmd-regeneration Cyclesmentioning

confidence: 80%

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In Situ Regeneration of Alumina-Supported Cobalt–Iron Catalysts for Hydrogen Production by Catalytic Methane Decomposition

et al. 2018

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A novel approach to the in situ regeneration of a spent alumina-supported cobalt–iron catalyst for catalytic methane decomposition is reported in this work. The spent catalyst was obtained after testing fresh catalyst in catalytic methane decomposition reaction during 90 min. The regeneration evaluated the effect of forced periodic cycling; the cycles of regeneration were performed in situ at 700 °C under diluted O2 gasifying agent (10% O2/N2), followed by inert treatment under N2. The obtained regenerated catalysts at different cycles were tested again in catalytic methane decomposition reaction. Fresh, spent, and spent/regenerated materials were characterized using X-ray powder diffraction (XRD), transmission electron microscopy (TEM), laser Raman spectroscopy (LRS), N2-physisorption, H2-temperature programmed reduction (H2-TPR), thermogravimetric analysis (TGA), and atomic absorption spectroscopy (AAS). The comparison of transmission electron microscope and X-ray powder diffraction characterizations of spent and spent/regenerated catalysts showed the formation of a significant amount of carbon on the surface with a densification of catalyst particles after each catalytic methane decomposition reaction preceded by regeneration. The activity results confirm that the methane decomposition after regeneration cycles leads to a permanent deactivation of catalysts certainly provoked by the coke deposition. Indeed, it is likely that some active iron sites cannot be regenerated totally despite the forced periodic cycling.

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“…Then, the fourth peak was associated to the interaction between bulk CeO 2 and Fe species (777 °C). Thereby, the broad peak around 777 °C were mainly regarded as the redox reaction between Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ , which was driven by the generation of Fe‐O‐Ce . However, with the addition of HSiW, a shift of reduction peaks toward higher temperature was observed on the rest of four catalysts, demonstrated the existence of the synergetic reactions among HSiW and Ce‐Fe‐O x and oxygen species .…”

Section: Resultsmentioning

confidence: 99%

Silicotungstic acid modified Ce‐Fe‐O_x catalyst for selective catalytic reduction of NO_x with NH₃: Effect of the amount of HSiW

Song

Xing

Zhang

et al. 2019

Applied Organom Chemis

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The HSiW(x)/Ce‐Fe catalysts were used to research the effect of silicotungstic acid contents on the catalytic activity in the selective catalytic reduction of NOx with NH3. Doping different contents of silicotungstic acid affected surface species and redox property as well as the catalytic activity. With the increasing amount of HSiW (x = 5%, 10% and 20%), the redox reaction between Fe3+/Fe2+ and Ce4+/Ce3+ enhanced, which could improve the ratio of Ce3+ and Fe3+. And then, more Ce3+ increased the ratio of chemisorbed oxygen (Oα). Besides, the type and strength of acid sites over HSiW(x)/Ce‐Fe was affected by the HSiW contents. These factors facilitated the catalytic performance. Thus, the NOx conversion of HSiW(x)/Ce‐Fe(x = 20%) was higher than 90%, which maintained in a wide temperature range between 200 and 400 °C.

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Fe catalysts for methane decomposition to produce hydrogen and carbon nano materials

Cited by 223 publications

References 79 publications

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

In Situ Regeneration of Alumina-Supported Cobalt–Iron Catalysts for Hydrogen Production by Catalytic Methane Decomposition

Silicotungstic acid modified Ce‐Fe‐O_x catalyst for selective catalytic reduction of NO_x with NH₃: Effect of the amount of HSiW

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Fe catalysts for methane decomposition to produce hydrogen and carbon nano materials

Cited by 223 publications

References 79 publications

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

In Situ Regeneration of Alumina-Supported Cobalt–Iron Catalysts for Hydrogen Production by Catalytic Methane Decomposition

Silicotungstic acid modified Ce‐Fe‐Ox catalyst for selective catalytic reduction of NOx with NH3: Effect of the amount of HSiW

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Silicotungstic acid modified Ce‐Fe‐O_x catalyst for selective catalytic reduction of NO_x with NH₃: Effect of the amount of HSiW