A series of pure polyoxometalate salts, K_x[PMo₁₂O₄₀]³⁻ (K_xPMo, x = 1, 2, 3, 4), have been successfully prepared via a one pot hydrothermal method using F127 as a template. These obtained K_xPMo materials are mesoporous, and have high surface area (>40 m² g⁻¹) without depending on the supports. In particular, these K_xPMo materials display an increased efficiency towards oxidative desulfurization (ODS). These materials could be reused, and result in the complete desulfurization of diesel in 1 h. In addition, our experimental test shows that the high activity of K_xPMo catalysts (such as K_1.0PMo, K_2.0PMo, K_3.0PMo and K_4.0PMo) are linearly correlated with their electrochemically-active surface area (ECSA). K_4.0PMo has the largest ECSA value and exposes largest number anions ([PMo₁₂O₄₀]³⁻), resulting in the best ODS activity. This study reveals the role of ECSA in the ODS reaction, providing a new understanding for ODS in mesoporous K_xPMo materials.

中文翻译：

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一锅制备介孔KxPMo12O40（x = 1，2，3，4）材料用于氧化脱硫：电化学活性表面积（ECSA）决定其活性

通过以F127为模板的单锅水热法成功地制备了一系列纯多金属氧酸盐K _x [PMo ₁₂ O ₄₀ ] ^3-（K _x PMo，x = 1，2，3，4）。这些获得的K _x PMo材料是介孔的，并且具有高表面积（> 40 m ² g ^-1），而无需依赖于载体。特别是这些K _xPMo材料显示出更高的氧化脱硫（ODS）效率。这些材料可以重复使用，并在1小时内导致柴油完全脱硫。此外，我们的实验测试表明，K _x PMo催化剂（如K _1.0 PMo，K _2.0 PMo，K _3.0 PMo和K _4.0 PMo）的高活性与其电化学活性表面积（ECSA）线性相关。K _4.0 PMo具有最大的ECSA值，并且可暴露最多数量的阴离子（[PMo ₁₂ O ₄₀ ] ³⁻），从而获得最佳的ODS活性。这项研究揭示了ECSA在ODS反应中的作用，为中孔K _x PMo材料中的ODS提供了新的认识。