The effect of tin on the formation and properties of Pt/MgAl(Sn)Ox catalysts for dehydrogenation of alkanes

[Display omitted] •Tin containing layered double hydroxides (LDH) synthesis.•Propane and n-decane dehydrogenation on the platinum catalysts based on MgAl(Sn)Ox.•Electronic state of platinum in the Pt/MgAl(Sn)Ox catalysts. The MgAl(Sn) layered double hydroxides (LDH) with the atomic ratios Mg/(Al + S...

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Bibliographic Details
Published in:Catalysis today 2019-06, Vol.329, p.187-196
Main Authors: Belskaya, O.B., Stepanova, L.N., Nizovskii, A.I., Kalinkin, A.V., Erenburg, S.B., Trubina, S.V., Kvashnina, K.O., Leont’eva, N.N., Gulyaeva, T.I., Trenikhin, M.V., Bukhtiyarov, V.I., Likholobov, V.A.
Format: Article
Language:English
Subjects:
EXAFS
n-Decane dehydrogenation
Platinum catalysts
Propane dehydrogenation
Tin containing layered double hydroxides
XPS
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Summary:[Display omitted] •Tin containing layered double hydroxides (LDH) synthesis.•Propane and n-decane dehydrogenation on the platinum catalysts based on MgAl(Sn)Ox.•Electronic state of platinum in the Pt/MgAl(Sn)Ox catalysts. The MgAl(Sn) layered double hydroxides (LDH) with the atomic ratios Mg/(Al + Sn) = 3 and Sn/(Sn + Al) = 0, 0.002, 0.005, 0.01, 0.05, 0.1, 0.3, 0.5, 0.7, 1.0 were synthesized and the ratio Sn/(Sn + Al) ≤ 0.1 was shown to provide the formation of systems with uniform phase composition. Mixed oxides derived from LDH retain the high specific surface area of 150-200 m2/g and the basic properties when some aluminium atoms are replaced with tin. It was found that the Sn-containing mixed oxides are able to restore the layered structure during rehydration and intercalate the anion precursors of platinum into the interlayer space of the formed LDH. The emerging platinum sites initiate the reduction of tin at temperatures below 723 K. TEM, EXAFS and XPS studies demonstrated that tin introduction in the support increases the dispersion of supported platinum. An extreme dependence of the activity of Pt/MgAl(Sn)Ox catalysts in propane and n-decane dehydrogenation on the tin content in the support was revealed. The active catalysts are characterized by the phase and elemental uniformity of the support, highly disperse state of Pt(0), and the absence of a noticeable amount of reduced tin and bimetallic particles.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2018.11.081