The One-Step Oxidation of Methanol to Dimethoxymethane over Nanostructure Vanadium-Based Catalysts
The One-Step Oxidation of Methanol to Dimethoxymethane over Nanostructure Vanadium-Based Catalysts
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DOI：
10.1007/s10562-010-0263-x
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发表时间：
2010-03-01
影响因子：
2.8
通讯作者：
Sun, Yuhan
中科院分区：
文献类型：
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作者：
Guo, Heqin;Li, Debao;Sun, Yuhan
采用快速燃烧法（RC）制备了VOx-TiO2 （VT-RC）和硫酸化VOx-TiO2 （VTS-RC）催化剂，并通过甲醇一步氧化制二甲氧基甲烷（DMM）进行了评价。结果表明：VT-RC和VTS-RC催化剂均为纳米颗粒，具有孔隙结构；与共沉淀型VOx-TiO2 （VT-CP）催化剂相比，VT-RC催化剂表现出更多的酸性位点和更强的还原性。在VT催化剂中加入硫酸盐进一步增加了酸性位点的数量，对还原性影响不大。催化实验表明，在甲醇转化率为35%时，VT-RC催化剂具有较高的DMM选择性（89.96%），在甲醇转化率为48%时，VTS-RC催化剂的DMM选择性进一步提高（91.76%），这是由于这些催化剂的酸性位点数量更多，还原性更强。
The VOx-TiO2 (VT-RC) and sulfated VOx-TiO2 (VTS-RC) catalysts were prepared by rapid combustion method (RC) and evaluated by the one-step oxidation of methanol to dimethoxymethane (DMM). The results showed that the VT-RC and VTS-RC catalysts were consisted of nano-particles and exhibited pore structure. Compared with the coprecipitated VOx-TiO2 (VT-CP) catalyst, the VT-RC catalyst showed more acidic sites and stronger reducibility. The addition of sulfate into VT catalyst further increased the number of acidic sites and had little effect on the reducibility. The catalytic test showed that the VT-RC catalyst exhibited high DMM selectivity (89.96% at 35% methanol conversion), which was further increased on VTS-RC catalyst (91.76% at 48% methanol conversion), and that was due to the larger number of acidic sites and stronger reducibility on these catalysts.