Abstract The solubility of ammonium tungstate in a special hydrothermal condition is exploited to synthesize uniform microspheres of Ce-Cu-W-O oxides. Compared to their W-undoped counterparts, they possess more Ce3+ and oxygen vacancies, thereby promoting oxygen mobility. The formed rich WO3 surface can effectively provide acid sites, which is helpful for adsorption of vinyl chloride and interrupting the C–Cl bond. In addition, the presence of WO3 induces the formation of finer CuO nanoparticles with respect to the traditional coprecipitation method, thereby resulting in a better reducibility. Benefiting from both the enhanced acidity and reducibility, the Ce-Cu-W-O microspheres deliver excellent low-temperature vinyl chloride oxidation activity (a reaction rate of 2.01 × 10−7 mol/(gcat·s) at 250 °C) and high HCl selectivity. Moreover, subtle deactivation occurs after the three cycling activity tests, and a stable vinyl chloride conversion as well as mineralization are observed during the 72-h durability test at 300 °C, which demonstrates good thermal stability. Our strategy can provide new insights into the design and synthesis of metal oxides for catalytic oxidation of chlorinated volatile organic compounds.

中文翻译：

---

用于高效催化氧化氯乙烯排放物的 Ce-Cu-WO 微球的新合成路线

摘要 利用钨酸铵在特殊水热条件下的溶解度，合成了均匀的Ce-Cu-WO氧化物微球。与未掺杂 W 的对应物相比，它们具有更多的 Ce3+ 和氧空位，从而促进氧迁移。形成的富WO3表面可以有效提供酸性位点，有利于氯乙烯的吸附和中断C-Cl键。此外，与传统的共沉淀方法相比，WO3 的存在会诱导形成更细的 CuO 纳米粒子，从而导致更好的还原性。受益于增强的酸性和还原性，Ce-Cu-WO 微球具有优异的低温氯乙烯氧化活性（250°C 下的反应速率为 2.01 × 10−7 mol/(gcat·s)）和高 HCl选择性。而且，在三个循环活性测试后发生了轻微的失活，在 300°C 的 72 小时耐久性测试中观察到稳定的氯乙烯转化和矿化，这表明具有良好的热稳定性。我们的策略可以为催化氧化氯化挥发性有机化合物的金属氧化物的设计和合成提供新的见解。