The control of acidic properties in a catalyst is one of the key features of technology utilizing biomass for chemical production. In this study, the Brönsted and Lewis bi-acidic SnAl-beta zeolites with controllable acidity were successfully prepared by acid dealumination and isomorphic substitution of Al by Sn, and applied for the cascade conversion of glucose to 5-hydroxymethylfurfural (5-HMF). The Lewis acidity of the catalysts was increased as the higher concentration of nitric acid used for the dealumination process. The optimum portion of Lewis/(Brönsted+Lewis) ratio was investigated to maximize the yield of 5-HMF, which is converted from the glucose via fructose by the cascade reaction. The conversion of glucose was increased until the L/(B+L) ratio reached 0.89 and the selectivity to 5-HMF reached its maximum at the Lewis acid portion of 0.76 among the total acid sites.

催化剂中酸性特性的控制是利用生物质进行化学生产的技术的关键特征之一。本研究通过酸脱铝和Sn同晶取代Al成功制备了酸度可控的Brönsted和Lewis双酸性SnAl-β沸石，并将其应用于葡萄糖级联转化为5-羟甲基糠醛（5-HMF）。催化剂的路易斯酸度随着用于脱铝过程的硝酸浓度升高而增加。研究了 Lewis/(Brönsted+Lewis) 比率的最佳部分，以最大限度地提高 5-HMF 的产量，5-HMF 是通过级联反应通过果糖从葡萄糖转化而来的。葡萄糖的转化率增加，直到 L/(B+L) 比率达到 0.89 并且对 5-HMF 的选择性在路易斯酸部分达到 0 时达到最大值。