Catalyzed Oxidation of Methanol on Acid/Base Modified VOx/Al2O3 Studied by Solid-state NMR

Chinese Journal of Magnetic Resonance ›› 2007, Vol. 24 ›› Issue (3): 239-247.

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Catalyzed Oxidation of Methanol on Acid/Base Modified VO_x/Al₂O₃Studied by Solid-state NMR

ZENG Dan-lin; YANG Jun; ZHENG An-min; CHEN Lei; XU Jun; YE Chao-hui; DENG Feng

State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics (Wuhan Institute of Physics and Mathematics, the Chinese Academy of Sciences), Wuhan 430071, China

Received:2007-01-04 Revised:2007-01-10 Published:2007-09-05 Online:2009-12-05
Contact: Deng Feng

Abstract

Abstract: Oxidation of methanol catalyzed by NaOH or HNO₃ modified VO_x/Al₂O₃ was studied by solid-state nuclear magnetic resonance (NMR) spectroscopy. The acid-treated VO_x/Al₂O₃ catalyst showed stronger Bronsted acid sites compared to the unmodified VO_x/Al₂O₃ catalyst, while the base-treated VO_x/Al₂O₃ catalyst had no Bronsted acid sites. As a result, the former exhibited higher selectivity in producing dimethoxymethane from oxidation of methanol whereas the oxidation reaction catalyzed by the later yielded mainly formate. These results indicate that the Bronsted acid sites in VO_x/Al₂O₃ catalysts play a key role in the oxidation reaction converting methanol to dimethoxymethane.

Key words: solid-state NMR, catalysis, methanol oxidation, vanadium oxide

ZENG Dan-lin; YANG Jun; ZHENG An-min; CHEN Lei; XU Jun; YE Chao-hui; DENG Feng. Catalyzed Oxidation of Methanol on Acid/Base Modified VO_x/Al₂O₃Studied by Solid-state NMR[J]. Chinese Journal of Magnetic Resonance, 2007, 24(3): 239-247.

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Catalyzed Oxidation of Methanol on Acid/Base Modified VO_x/Al₂O₃Studied by Solid-state NMR

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