Catalytic behavior and surface species investigation over γ-Al2O3 in dimethyl ether hydrolysis

Authors: Pussana Hirunsit, Kajornsak Faungnawakij, Supawadee Namuangruk, Chuleeporn Luadthong

Abstract:
The catalytic behavior and surface species over γ-Al₂O₃ in hydrolysis of dimethyl ether (DME) was examined by experimental and theoretical studies. It was experimentally observed that γ-Al₂O₃ substantially catalyzed DME hydrolysis producing methanol at 250–350^◦C with high stability at this temperature range with respect to carbon formation. Other carbon-containing species yielded from side reactions were present in trace amounts at temperatures below 375^◦C. The Density Functional Theory calculations results suggested that DME hydrolysis is thermodynamically favorable on the hydroxylated γ-Al₂O₃(1 1 0) but it is not favorable on (1 0 0) surfaces at this reaction temperature range. The DME hydrolysis on γ-Al₂O₃ is more likely to occur at a hydroxyl surface group which has relatively high acidity.

Keywords:
γ-Al₂O₃
Hydroxylated γ-Al₂O₃
Hydrolysis
Dimethyl ether
Methanol

Published in: Applied catalysis A: General  (Volumes 460–461, Pages 1-132, 10 June 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Catalytic behavior and surface species investigation over γ-Al2O3 in dimethyl ether hydrolysis

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