科创中国

Cesium salts supported heteropoly acid for oxidation of methacrolein to methacrylic acid

• 摘要：

  A series of novel heteropoly catalysts (H₄PMo₁₁VO₄₀/Cs₄PMo₁₁VO₄₀) with core shell structure were designed and synthesized for effective oxidation of methacrolein to methacrylic acid. The effects of H₄PMo₁₁VO₄₀ supporting amount on catalytic properties were investigated. With the hydrothermal treatment temperature increased from 25 to 180 °C, the surface area of Cs₄PMo₁₁VO₄₀ decreased from 123.6 to 7.7 m² g⁻¹, while the acidity and oxidation susceptibility of Cs₄PMo₁₁VO₄₀ were enhanced due to its re-crystallization. The XRD results showed that the crystalline form of H₄PMo₁₁VO₄₀ changed from triclinic to cubic form because of the guidance effect of Cs₄PMo₁₁VO₄₀. BET, NH₃-TPD and XPS results indicated that compared with bulk H₄PMo₁₁VO₄₀, surface area and oxidation susceptibility of the supported one increased significantly, and the acidity decreased. The sui thickness of H₄PMo₁₁VO₄₀ layer on Cs₄PMo₁₁VO₄₀ was a key point to tune the surface area, oxidation susceptibility and acidity of catalysts. At 310 °C, the methacrolein conversion and methacrylic acid selectivity on the optimum supported catalyst were more than 85% and 75%, respectively, which were much better than those on bulk H₄PMo₁₁VO₄₀ (39% and 46%), Cs₄PMo₁₁VO₄₀ (15.6% and 0%) and Cs_2.6H_1.4PMo₁₁VO₄₀ (99.9% and 36.5%).

• 作者：

  Lilong Zhou;Lei Wang;Yanyan Diao;Ruiyi Yan;锁江 张

• 刊名：

  Molecular Catalysis

• 在线出版时间：

  2017