Liu Wenzhu, Guo Ruike, Peng Guanmin, Yin Dulin
College of Chemistry and Materials Engineering, Huaihua University, Huaihua 418000, China.
National & Local Joint Engineering Laboratory for New Petro-Chemical Materials and Fine Utilization of Resources, Hunan Normal University, Changsha 410081, China.
Nanomaterials (Basel). 2022 Apr 25;12(9):1462. doi: 10.3390/nano12091462.
Through the amination of oxidized activated carbon with ethylenediamine and then the adsorption of sulfuric acid, a strong carbon-based solid acid catalyst with hydrogen sulfate (denoted as AC-N-SOH) was prepared, of which the surface acid density was 0.85 mmol/g. The acetalization of benzaldehyde with ethylene glycol catalyzed by AC-N-SOH was investigated. The optimized catalyst dosage accounted for 5 wt.% of the benzaldehyde mass, and the molar ratio of glycol to benzaldehyde was 1.75. After reacting such mixture at 80 °C for 5 h, the benzaldehyde was almost quantitatively converted into acetal; the conversion yield was up to 99.4%, and no byproduct was detected. It is surprising that the catalyst could be easily recovered and reused ten times without significant deactivation, with the conversion yield remaining above 99%. The catalyst also exhibited good substrate suitability for the acetalization of aliphatic aldehydes and the ketalization of ketones with different 1,2-diols.
通过用乙二胺对氧化活性炭进行胺化，然后吸附硫酸，制备了一种具有硫酸氢根的强碳基固体酸催化剂（记为AC-N-SOH），其表面酸密度为0.85 mmol/g。研究了AC-N-SOH催化苯甲醛与乙二醇的缩醛化反应。优化后的催化剂用量占苯甲醛质量的5 wt.%，乙二醇与苯甲醛的摩尔比为1.75。将该混合物在80℃下反应5小时后，苯甲醛几乎定量地转化为缩醛；转化率高达99.4%，未检测到副产物。令人惊讶的是，该催化剂可以很容易地回收并重复使用十次而无明显失活，转化率保持在99%以上。该催化剂对脂肪醛的缩醛化反应以及酮与不同1,2 -二醇的缩酮化反应也表现出良好的底物适用性。
