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Properties of surface compounds in methanol conversion on γ-Al2O3: Data of in situ IR spectroscopy

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Abstract

In situ IR spectroscopic studies show that a formate, an aldehyde-like complex, and bridging and linear methoxy groups exist on the alumina surface involved in methanol conversion. In the absence of methanol in the gas phase, the interaction between two bridging methoxy groups yields dimethyl ether in the gas phase. When methanol is present in the gas phase, it interacts with methoxy groups on the surface. This reaction makes the main contribution to the formation of dimethyl ether. The linear methoxy group undergoes conversion via several routes. The main route is desorption with methanol formation in the gas phase, and no more than 10% of the linear methoxy groups are converted into formate and aldehyde, which are CO2 sources in the gas phase. In the absence of methanol in the gas phase, the conversion rate of the methoxy groups is independent of the presence of water and oxygen. A scheme of the surface reactions is suggested to explain the conversion of the methoxy groups.

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 119991, Russia

    V. A. Matyshak, L. A. Berezina & O. N. Sil’chenkova

  2. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, 119991, Russia

    V. F. Tret’yakov, G. I. Lin & A. Ya. Rozovskii

Authors
  1. V. A. Matyshak
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  2. L. A. Berezina
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  3. O. N. Sil’chenkova
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  4. V. F. Tret’yakov
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  5. G. I. Lin
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  6. A. Ya. Rozovskii
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Correspondence to V. A. Matyshak.

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Original Russian Text © V.A. Matyshak, L.A. Berezina, O.N. Sil’chenkova, V.F. Tret’yakov, G.I. Lin, A.Ya. Rozovskii, 2009, published in Kinetika i Kataliz, 2009, Vol. 50, No. 1, pp. 120–131.

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Matyshak, V.A., Berezina, L.A., Sil’chenkova, O.N. et al. Properties of surface compounds in methanol conversion on γ-Al2O3: Data of in situ IR spectroscopy. Kinet Catal 50, 111–121 (2009). https://doi.org/10.1134/S0023158409010157

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