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首页> 外文期刊>RSC Advances >Surfactant-assisted synthesis of Mo–V mixed oxide catalysts for upgraded one-step conversion of glycerol to acrylic acid
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Surfactant-assisted synthesis of Mo–V mixed oxide catalysts for upgraded one-step conversion of glycerol to acrylic acid

机译：表面活性剂辅助的Mo–V混合氧化物催化剂的合成，一步法将甘油转化为丙烯酸

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The catalytic properties of Mo–V mixed oxides hydrothermally synthetized in the presence of ionic surfactants (SDS and CTAB) were investigated in the gas-phase oxidative dehydration of glycerol. The presence of surfactants promoted a change in morphology of MoV _(2) O _(8) phase, directing to formation of rod-shaped crystals, and, consequently, an increase in macroporosity of materials, generated by intercrystallite spaces, when compared to a reference sample. Rod-like morphology stabilized the MoV _(2) O _(8) mixed oxide phase during glycerol conversion, avoiding migration of vanadium from crystalline to amorphous phase, like observed in the reference sample, favoring the dynamic of reduction/reoxidation of vanadium and, consequently contributing to an increase in efficiency and stability of the catalyst. Both SDS and CTAB catalysts presented higher productivity of acrylic acid and good catalytic stability, with no coke formation and considerable decrease in CO _(X) evolution during 6 h of reaction. SDS presented the best catalytic results with 100% of conversion, 57% of acrylic acid selectivity and 36% of CO _(X) selectivity.
机译：在甘油的气相氧化脱水中研究了在离子表面活性剂（SDS和CTAB）存在下水热合成的Mo–V混合氧化物的催化性能。表面活性剂的存在促进了MoV _（2）O _（8）相的形态变化，导致形成棒状晶体，因此，与之相比，由晶间空间产生的材料的大孔隙度增加了参考样品。棒状形态在甘油转化过程中稳定了MoV _（2）O _（8）混合氧化物相，避免了钒从晶态迁移到非晶相，就像在参考样品中观察到的那样，有利于钒和铁的还原/再氧化动力学。因此，有助于提高催化剂的效率和稳定性。 SDS和CTAB催化剂均显示出较高的丙烯酸产率和良好的催化稳定性，在6小时的反应过程中未形成焦炭，并且CO _（X）释放量大大降低。 SDS以100％的转化率，57％的丙烯酸选择性和36％的CO _（X）选择性表现出最佳的催化效果。

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