Polyoxymethylene dimethyl ethers (OMEs) emerging as green additives for soot emission suppression receive significant attention due to their similar physical properties to diesel. Herein, the transformative pathways of dimethoxymethane (DMM) and trioxane reactions for OMEs production catalyzed by [Omim]Cl/ZnCl₂ having different ZnCl₂ content were demonstrated in combination with the clarification of active species, kinetic and thermodynamic properties, and chemical nature for trioxane decomposition and subsequential formaldehyde insertion steps. The role of [Omim]Cl, which could transform to [Omim]ZnCl₃ or [Omim]Zn₂Cl₅ under different ZnCl₂ content, laid in the formation of active zinc species and promotion of their homogeneity with reactants. The DMM chain growth, which followed the same mechanism and kinetic law, showed kinetic and thermodynamic regimes and had identical equilibrium distribution of OMEs. Only Zn₂Cl₅⁻ species were active for trioxane decomposition, which was the kinetic-relevant step, while both ZnCl₃⁻ and Zn₂Cl₅⁻ were effective for DMM chain elongation.

中文翻译：

---

[Omim]Cl/ZnCl2催化合成聚甲醛二甲醚的动力学和热力学研究

聚甲醛二甲醚 (OME) 作为抑制烟尘排放的绿色添加剂而受到广泛关注，因为它们与柴油具有相似的物理特性。在此，通过具有不同 ZnCl _{2含量的 [Omim]Cl/ZnCl 2}催化的二甲氧基甲烷 (DMM) 和三氧杂环己烷反应生产 OMEs 的转化途径，并阐明了活性物种、动力学和热力学性质以及化学性质三恶烷分解和随后的甲醛插入步骤。[Omim]Cl的作用，在不同的ZnCl ₂下可以转化为[Omim]ZnCl ₃或[Omim]Zn ₂ Cl ₅含量，在于形成活性锌物种并促进它们与反应物的均匀性。DMM 链增长遵循相同的机制和动力学定律，显示出动力学和热力学状态，并且具有相同的 OME 平衡分布。只有 Zn ₂ Cl ₅ ^-物种对三恶烷分解具有活性，这是动力学相关步骤，而 ZnCl ₃ ^-和 Zn ₂ Cl ₅ ^-对 DMM 链延长均有效。