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Citation: TAO Yue-Wu, ZHONG Shun-He. Laser Stimulated Selective Oxidation of i-Butane to Methacrylic Acid over Mo₄V₆O₂₄[J]. Chinese Journal of Applied Chemistry, ;2001, 18(1): 16-20. shu

Laser Stimulated Selective Oxidation of i-Butane to Methacrylic Acid over Mo₄V₆O₂₄

1.
College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072

Received Date: 27 April 2000
Available Online: 8 September 2000
Fund Project: 国家自然科学基金项目(29773031) (29773031)

A Mo/V complex oxide was prepared from (NH₄)₆Mo₇O₂₆·4H₂O and NH₄VO₃ by a coprecipitation method. The surface composition, structure, chemsorption and behavior of laser stimulated selective oxidation of isobutane have been investigated by XRD, IR, TPD and microreactor. The results showed that the main phase of the complex oxide is Mo₄V₆O₂₄, which has a storeyed structure composed of MoO₃ and V₂O₄. There are both Lewis base sites, O^2- in the surface Mo=O or Mo-O-V bonds, and Lewis acid site, V⁴⁺ appeared on the surface of complex oxide. Two methyl hydrogens in isobutane molecule can be chemisorbed on the terminal oxygen of the neibouring Mo=O bonds on the surface of the complex oxide. Under the conditions of 0 1 MPa, 200℃ and 1000 times of laser excitation with 972 cm^-1 on the Mo=O bonds, about 6.5% isobutane were converted to isobutene, methyl propenal and methacrylic aicd, among them 78% were the latter. A mechanism is proposed for isobutane selective oxidation.
- isobutane,
- selective oxidation,
- laser stimulated surface reaction,
- Mo/V complex oxide,
- methacrylic acid
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Laser Stimulated Selective Oxidation of i-Butane to Methacrylic Acid over Mo₄V₆O₂₄