How to prepare efficient and stable supported POMs catalysts is the key to improve the catalytic efficiency of POMs. In this work Cs⁺ and Cu²⁺ doped phosphomolybdenum vanadium acid has been inserted into the crevice of expanded graphite for the catalytic oxidation of methacrolein to methacrylic acid. The supported POMs show excellent acidity and oxidability due to the good dispersion of POMs crystals and interactions between POMs and expanded graphite that expanded graphite can draw electrons from POMs. The catalytic activity has been improved for 8 times and methacrylic acid selectivity has been increased more than 20%. Unlike other supported POMs, expanded graphite supported POMs shows good catalytic stability. This work shows an easy way to prepared efficient supported POMs for catalytic oxidation.

如何制备高效稳定的负载型POMs催化剂是提高POMs催化效率的关键。在这项工作中 Cs ⁺和 Cu ²⁺将掺杂磷钼钒酸插入膨胀石墨的缝隙中，用于将甲基丙烯醛催化氧化为甲基丙烯酸。由于POM晶体的良好分散性以及POM与膨胀石墨之间的相互作用，膨胀石墨可以从POM中吸引电子，负载型POM表现出优异的酸性和氧化性。催化活性提高8倍，甲基丙烯酸选择性提高20%以上。与其他负载型 POM 不同，膨胀石墨负载型 POM 显示出良好的催化稳定性。这项工作展示了一种制备用于催化氧化的高效负载型 POM 的简单方法。