The One Step Oxidation of Methanol to Dimethoxymethane on V2O5/CeO2 Catalysts
Heqin Guoa, Bo Houa, Litao Jiaa, Debao Lia*
a State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China.
*Corresponding author: Tel. /Fax: +86 351 4040410. E-mail addresses: firstname.lastname@example.org
Dimethoxymethane (CH3OCH2OCH3), as an important chemical intermediate, was widely used as diesel additive and building block in organic synthesis. Generally, DMM is produced by the two-stage synthesis. Such a flow chart could lead to a high cost, which inhibits the application of DMM. Compared with the two-step technique, the one-stage technique can synthesize DMM on the bi-founctional (employing redox sites and acidic sites) catalysts (3CH3OH + 1/2O2 °úCH3OCH2OCH3 + 2H2O). This technique is expected to avoid the drawback of the two-stage production.
In the present study, the V2O5/CeO2 catalysts with different V2O5 content were prepared by the Sol-Gel method and characterized by XRD, BET, Raman, NH3-TPD and H2-TPR techniques. The catalytic properties were evaluated by the one-step oxidation of methanol to dimethoxymethane. The results showed that the vanadium was monolayer dispersed as V2O5 content was 15 wt%, aggregated as V2O5 crystalline above 20 wt% and formed CeVO4 at 30 wt%. The higher dispersion of vanadium can lead to stronger reducibility and more acidic sites, which were closely related to the higher methanol conversion and dimethoxymethane (DMM) selectivity.
Keywords: Vanadia-cerium catalyst; Methanol oxidation reaction; Acidity; Redox; Dimethoxymethane
See more of this Group/Topical: Catalysis and Reaction Engineering Division