Polyoxymethylene dimethyl ethers (PODE_n, CH₃O(CH₂O)_nCH₃, where n ≥ 1) are receiving much attention as ideal diesel fuel additives because they can significantly reduce the emission of smoke and engine exhaust during combustion. PODE_n are synthesized over acid catalysts. In this work, highly efficient sulfate titania catalysts were prepared by impregnation for the synthesis of PODE_n from dimethoxymethane (DMM) and paraformaldehyde (PF). XPS and XRF were used to determine the spatial distribution of S, and NH₃-TPD and Pyridine-IR were used to measure acid properties. The concentration of the precursor solution had an important effect on the catalyst activity. The spatial distribution of S influenced the acid properties and catalyst activity. A catalytic mechanism based on Brønsted and Lewis acid sites was proposed, which explained the synergistic effect of Brønsted and Lewis acid sites in the reaction for the first time.

聚甲醛二甲醚（颇得_Ñ，CH ₃ O（CH ₂ O）_Ñ CH ₃，其中Ñ  ≥1）受到较多关注作为理想的柴油机燃料添加剂，因为它们可以减少显著燃烧过程中的烟雾和发动机排气的排放。PODE _n在酸催化剂上合成。在这项工作中，通过浸渍从二甲氧基甲烷（DMM）和多聚甲醛（PF）合成PODE _n制备了高效硫酸盐二氧化钛催化剂。XPS和XRF用于确定S和NH ₃的空间分布-TPD和吡啶-IR用于测量酸性质。前体溶液的浓度对催化剂活性具有重要影响。S的空间分布影响酸性质和催化剂活性。提出了基于布朗斯台德和路易斯酸位的催化机理，这首次解释了布朗斯台德和路易斯酸位在反应中的协同作用。