Liu Wenzhu, Xiao Jiafu, Xu Qiong, Liu Xianxiang, Zhong Sheng, Huang Hua, Zheng Min, Kirk Steven Robert, Yin Dulin
National and Local Joint Engineering Laboratory for New Petro-Chemical Materials and Fine Utilization of Resources, College of Chemistry and Chemical Engineering, Hunan Normal University 410081 Changsha China
Hunan Changling Petrochemical S & T Developing Co. Ltd 414012 Yueyang China.
RSC Adv. 2018 Dec 21;9(1):185-191. doi: 10.1039/c8ra09457h. eCollection 2018 Dec 19.
Imidazolyl activated carbon, denoted as AC-N, was prepared oxidation of AC with HNO (AC-O) and then refluxed with ethanediamine under mild conditions. The results showed that the N content of AC-N was 10.3%, and the surface alkali group density of AC-N was 0.96 mmol g from 0.78 mmol g carboxy group of AC-O by Boehm titration. It was revealed that the basic functional groups on the AC-N surface included imidazole and amine groups, from XPS and FT-IR. Evaluated with Michael addition of furfural, the catalytic performance of AC-N showed higher conversion and selectivity than that of commonly used base catalyst such as 2-methylimidazole and KOH. Very remarkably, AC-N showed extraordinary recyclability, in that there was no decline of conversion and selectivity after being recycled 5 times.
咪唑基活性炭（记为AC-N）通过用HNO对AC进行氧化（AC-O）制备，然后在温和条件下与乙二胺回流。结果表明，AC-N的N含量为10.3%，通过Boehm滴定法，AC-N的表面碱基团密度从AC-O的0.78 mmol/g羧基增加到0.96 mmol/g。XPS和FT-IR表明，AC-N表面的碱性官能团包括咪唑和胺基。用糠醛的迈克尔加成反应评估，AC-N的催化性能比常用的碱催化剂如2-甲基咪唑和KOH具有更高的转化率和选择性。非常显著的是，AC-N表现出非凡的可回收性，即循环使用5次后转化率和选择性没有下降。
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