The modified Al-MCM-41 solid acids with turning Si/Al molar ratio were successfully fabricated through a hydrothermal route and utilized as a suitable catalyst in the cellulose conversion into 5-hydroxylmethylfurfural (5-HMF). The crystal structure, composition, morphologies and porosity of as-synthesized acids were characterized by XRD, FT-IR, N₂ adsorption-desorption, TEM and EDS. The ²⁷Al MAS NMR and ²⁹Si-MAS NMR results revealed the existence of both Al framework and Al extra framework. Besides, the existence of medium-weak and strong acid sites, according to Brønsted and Lewis acidity, in Al-MCM-41 acids was confirmed by NH₃-TPD and FTIR-pyridine adsorption. The 30Al-MCM-41 solid acid (Si/Al molar ratio = 30) exhibited excellent activity with the highest 5-HMF yield of 40.56% compared to other samples. We also discovered that 5-HMF production, as well as cellulose conversion, strongly depended on the total acid, strong/medium-weak acid ratio, as well as Brønsted/Lewis acid ratio. Therefore, these parameters have been considered as essential factors for the design of solid acid for 5-HMF production.

通过水热法成功制备了具有Si / Al摩尔比变化的Al-MCM-41固体酸，并将其用作纤维素转化为5-羟甲基糠醛（5-HMF）的合适催化剂。用XRD，FT-IR，N ₂吸附-脱附，TEM和EDS对合成后的酸的晶体结构，组成，形貌和孔隙率进行了表征。在²⁷的Al MAS NMR和²⁹的Si-MAS NMR结果显示两者Al骨架和Al骨架外的存在。此外，根据NH ₃证实，根据Brønsted和Lewis酸度，在Al-MCM-41酸中存在中弱和强酸位点-TPD和FTIR-吡啶吸附。与其他样品相比，30Al-MCM-41固体酸（Si / Al摩尔比= 30）表现出出色的活性，最高5-HMF收率为40.56％。我们还发现5-HMF的产生以及纤维素的转化率在很大程度上取决于总酸，强酸/中弱酸比率以及布朗斯台德/路易斯酸比率。因此，这些参数已被认为是设计5-HMF生产固体酸的必要因素。