In this work, proton-exchanged *BEA zeolite with a high Si/Al ratio of 75 (Hβ-75), was demonstrated as an effective catalyst for the acetalization of glycerol with carbonyl compounds. This catalyst system was applicable to various substrates and reusable for at least 4 times with slight decrease in activity. The turnover frequency, based on acid site concentration, increased as a function of Hβ Si/Al
在这项工作中,具有高Si / Al比75(Hβ-75)的质子交换* BEA
沸石被证明是
甘油与羰基化合物
缩醛化的有效催化剂。该催化剂体系适用于各种底物,可重复使用至少4次,但活性略有下降。基于酸位点浓度的周转频率作为HβSi / Al比的函数而增加,表明
沸石疏
水表面性能的重要性。基于动力学研究,疏
水性和酸性位点浓度,定量讨论了Hβ-75所表现出的高效率的起源。