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Ni nanoparticles and the Kirkendall effect in dry reforming of methane

(2018) APPLIED SURFACE SCIENCE. 452. p.239-247
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Abstract
n this study we report a simple preparation technique for Ni/c-Al2O3 catalysts for the dry reforming of methane (DRM) at 800 C to produce CO and H2 (synthesis gas). Hard-templating with low and high surface area activated carbon was applied. The produced synthesis gas exhibited a low product ratio of H2: CO [0.04–0.12], due to reverse water-gas shift. After 75 h time on stream (TOS) minimal deactivation of the catalyst could be observed. A rather unusual activity evolution was found involving a sequence of minimum-maximum-plateau. A scheme was suggested, explaining the activity evolution based on the Ni-nanoparticle positioning from being bare or encapsulated by Al2O3. The Al2O3 shell cracks and undergoes restructuring during reaction making more active sites available for the reaction. Superior metal dispersion was achieved with average nickel nanoparticle size at 4.9 ± 1.3 nm. The sintering mechanism was also investigated. Surprisingly, hollow nickel nanoparticles were observed at 25 h TOS due to the nanoscale Kirkendall effect. This diffusion phenomenon between the core, Ni0 , and the outer shell, NiO, (Ni2+) lead to pronounced structural and morphological changes of the catalyst.
Keywords
Dry reforming, Methane, Greenhouse gases, Heterogeneous catalysis, Kirkendall effect, Hollow Ni-nanoparticles

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MLA
Pegios, N. et al. “Ni Nanoparticles and the Kirkendall Effect in Dry Reforming of Methane.” APPLIED SURFACE SCIENCE 452 (2018): 239–247. Print.
APA
Pegios, N., Bliznuk, V., Theofanidis, S.-A., Galvita, V., Marin, G., Palkovits, R., & Simeonov, K. (2018). Ni nanoparticles and the Kirkendall effect in dry reforming of methane. APPLIED SURFACE SCIENCE, 452, 239–247.
Chicago author-date
Pegios, N. , V. Bliznuk, Stavros-Alexandros Theofanidis, Vladimir Galvita, Guy Marin, R. Palkovits, and K. Simeonov. 2018. “Ni Nanoparticles and the Kirkendall Effect in Dry Reforming of Methane.” Applied Surface Science 452: 239–247.
Chicago author-date (all authors)
Pegios, N. , V. Bliznuk, Stavros-Alexandros Theofanidis, Vladimir Galvita, Guy Marin, R. Palkovits, and K. Simeonov. 2018. “Ni Nanoparticles and the Kirkendall Effect in Dry Reforming of Methane.” Applied Surface Science 452: 239–247.
Vancouver
1.
Pegios N, Bliznuk V, Theofanidis S-A, Galvita V, Marin G, Palkovits R, et al. Ni nanoparticles and the Kirkendall effect in dry reforming of methane. APPLIED SURFACE SCIENCE. 2018;452:239–47.
IEEE
[1]
N. Pegios et al., “Ni nanoparticles and the Kirkendall effect in dry reforming of methane,” APPLIED SURFACE SCIENCE, vol. 452, pp. 239–247, 2018.
@article{8562416,
  abstract     = {n this study we report a simple preparation technique for Ni/c-Al2O3 catalysts for the dry reforming of
methane (DRM) at 800 C to produce CO and H2 (synthesis gas). Hard-templating with low and high surface
area activated carbon was applied. The produced synthesis gas exhibited a low product ratio of H2:
CO [0.04–0.12], due to reverse water-gas shift. After 75 h time on stream (TOS) minimal deactivation of
the catalyst could be observed. A rather unusual activity evolution was found involving a sequence of
minimum-maximum-plateau. A scheme was suggested, explaining the activity evolution based on the
Ni-nanoparticle positioning from being bare or encapsulated by Al2O3. The Al2O3 shell cracks and undergoes
restructuring during reaction making more active sites available for the reaction. Superior metal dispersion
was achieved with average nickel nanoparticle size at 4.9 ± 1.3 nm. The sintering mechanism was
also investigated. Surprisingly, hollow nickel nanoparticles were observed at 25 h TOS due to the nanoscale
Kirkendall effect. This diffusion phenomenon between the core, Ni0
, and the outer shell, NiO, (Ni2+)
lead to pronounced structural and morphological changes of the catalyst.},
  author       = {Pegios, N.  and Bliznuk, V. and Theofanidis, Stavros-Alexandros and Galvita, Vladimir and Marin, Guy and Palkovits, R.  and Simeonov, K. },
  issn         = {0169-4332 },
  journal      = {APPLIED SURFACE SCIENCE},
  keywords     = {Dry reforming,Methane,Greenhouse gases,Heterogeneous catalysis,Kirkendall effect,Hollow Ni-nanoparticles},
  language     = {eng},
  pages        = {239--247},
  title        = {Ni nanoparticles and the Kirkendall effect in dry reforming of methane},
  url          = {http://dx.doi.org/doi:10.1016/j.apsusc.2018.04.229},
  volume       = {452},
  year         = {2018},
}

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