Ethanol selective oxidation into syngas over Pt-promoted fluorite-like oxide: SSITKA and pulse microcalorimetry study

M. N. Simonov, V. A. Sadykov, V. A. Rogov, A. S. Bobin, E. M. Sadovskaya, N. V. Mezentseva, A. V. Ishchenko, T. A. Krieger, A. C. Roger, A. C. van Veen

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

5 Цитирования (Scopus)

Аннотация

Catalysts based on oxides with a high lattice oxygen mobility and reactivity are known to be able to efficiently transform ethanol into syngas by selective oxidation. Mechanism of this reaction over Pt/Pr0.15Sm0.15Ce0.35Zr0.35O2 catalyst was studied by using SSITKA and pulse microcalorimetry. The rate–determining step is C[sbnd]C bond rupture in ethanol/acetaldehyde molecules, while C[sbnd]H bond breaking in the ethanol dehydrogenation step proceeds easily. The mechanism is described by step-wise red–ox scheme including ethanol oxidative decomposition on Pt sites with participation of bridging oxygen species (with the heat of adsorption ∼ 550 kJ/mol O2) located at Pt-oxide interface followed by fast reoxidation of reduced support sites by O2. Rapid oxygen migration from the oxide sites to Pt provides conjugation between these steps, thus suppressing coking.

Язык оригиналаанглийский
Страницы (с-по)157-163
Число страниц7
ЖурналCatalysis Today
Том278
DOI
СостояниеОпубликовано - 1 дек 2016

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