Effect of Sn on methane decomposition over Fe supported catalysts to produce carbon.
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Data
2011
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In this work, alumina-supported Sn containing Fe catalysts were investigated
in CVD reactions (Chemical Vapor Deposition) using methane for carbon
production. The catalysts were prepared with 10 wt.% of Fe (as Fe2O3) and 3, 6 and
12 wt.% of Sn (as SnO2) supported on Al2O3 named hereon Fe10Sn3A, Fe5Sn6A
and Fe10Sn12A, respectively. These catalysts were characterized by SEM, TPCVD,
TPR, TG, Raman,XRDand 57Fe and 119Sn Mössbauer spectroscopy.Methane reacts
with Fe10A catalyst (without Sn) in the temperature range 680–900◦C to produce
mainly Fe0, Fe3 C and 20 wt.% of carbon deposition. TPR and TPCVD clearly
showed that Sn strongly hinders the CH4 reaction over Fe catalyst. 57Fe Mössbauer
suggested that in the presence of Sn the reduction of Fe+3 by methane becomes very
difficult. 119Sn Mössbauer showed Sn+4 species strongly interact with metallic iron
after CVD, producing iron-tin phases such as Fe3SnC and FeSn2. This interaction
Sn–Fe increases the CVD temperatures and decreases the carbon yield leading to the
production of more organized forms of carbon such as carbon nanotubes, nanofibers
and graphite.
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Iron and tin catalysts, Carbon deposition, Chemical vapor deposition
Citação
FREITAS, P. E. de et al. Effect of Sn on methane decomposition over Fe supported catalysts to produce carbon. Hyperfine Interactions, v. 203, p. 67-74, 2011. Disponível em: <https://link.springer.com/article/10.1007/s10751-011-0348-y>. Acesso em: 20 abr. 2017.