Beta zeolite exhibits satisfactory catalytic activity in the synthesis of polyoxymethylene dimethyl ethers. However, their microporous channels have adverse effects on mass transfer of macromolecules. In this work, it was found that the textural and acidic properties of catalysts could be improved by citric acid treatment. Extensive characterization confirmed that citric acid induced significant pore-expanding on catalysts, and its dealumination and realumination effect could lead to reduced amount of total acid sites and increased amount of Brønsted acid sites (BAS). Meanwhile, a good positive correlation was found between amount of external weak BAS and initial reaction rate. It was speculated that BAS with relatively weak acid strength might be the primary active sites in this reaction. Compared with the blank sample, the initial reaction rate of optimal catalyst was increased by 100%, and the conversion of trioxane was increased by 86.5 %, indicating a significantly improved catalytic activity.

β沸石在聚甲醛二甲基醚的合成中表现出令人满意的催化活性。然而，它们的微孔通道对大分子的传质有不利影响。在这项工作中，发现通过柠檬酸处理可以改善催化剂的质构和酸性。广泛的特征证实柠檬酸在催化剂上引起显着的孔扩展，并且其脱铝和复铝效果可以导致总酸位的减少和布朗斯台德酸位（BAS）的增加。同时，外部弱BAS的量与初始反应速率之间存在良好的正相关。推测酸强度相对较弱的BAS可能是该反应的主要活性部位。与空白样品相比，