Gas phase oxidehydration of glycerol to acrylic acid over Mo/V and W/V oxide catalysts

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• 作者：Lingqin Shen ; Hengbo Yin ; ^{yin@ujs.edu.cn" class="auth_mail} ; Aili Wang ; Xiufeng Lu ; Changhua Zhang
• 关键词：Glycerol ; Acrylic acid ; Oxidehydration ; Mo/V oxide catalysts ; W/V oxide catalysts
• 刊名：Chemical Engineering Journal
• 出版年：15 May, 2014
• 年：2014
• 卷：244
• 期：Complete
• 页码：168-177
• 全文大小：942 K

文摘

Gas phase oxidehydration of glycerol over Mo/V and W/V oxide catalysts was investigated in a fixed bed reactor. The Mo/V and W/V oxide catalysts were facilely prepared by calcination method and characterized by XRD, XPS, Raman, and NH₃-TPD techniques. In addition to MoO₃ or V₂O₅, Mo₆V₉O₄₀ was formed in Mo/V oxide catalysts. The presence of V in W/V oxide catalysts caused the formation of hexagonal or orthorhombic WO₃ while monoclinic WO₃ was formed in the absence of V component. For Mo/V oxide catalysts, Mo₁V_0.25 oxide catalyst gave the maximum acrylic acid yield of 20.1% and the maximum acetic acid yield of 20.8% at the reaction temperature of 300 掳C. Mo₁V₄ oxide catalyst gave the maximum acrolein yield of 28.8% at 300 掳C. For W/V oxide catalysts, W₁V_0.25 oxide catalyst gave the maximum acrylic acid yield of 25.7% and the maximum acetic acid yield of 21.2% at 300 掳C. However, pure WO₃ catalyst gave the highest acrolein yield of 50.3% at 300 掳C. The yields of CO and CO₂ increased with increasing V content in both bimetal oxide catalysts. More Mo⁵⁺, W⁵⁺, and V⁴⁺ cations present in the bimetal oxide catalysts gave high catalytic oxidation activity.