Nanofibrillar Chitin Aerogels as Renewable Base Catalysts
Nanofibrillar Chitin Aerogels as Renewable Base Catalysts
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DOI：
10.1021/bm501320b
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发表时间：
2014-11-01
影响因子：
6.2
通讯作者：
Isogai, Akira
中科院分区：
文献类型：
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作者：
Tsutsumi, Yoshiyuki;Koga, Hirotaka;Isogai, Akira
我们展示了甲壳素纳米纤维气凝胶的制备及其作为基础催化剂的成功应用，以生产有用的化学品。采用冷冻干燥和超临界干燥工艺，制备了晶面含C2-胺基团的鱿鱼笔壳聚糖纳米纤维(ChNF)，制备了比表面积高达289m(2)g(-1)的气凝胶。将所制备的CHNF气凝胶用于Knovenagel水溶液缩合反应，作为高效的碱催化剂，表明纳米纤维气凝胶结构与晶态CHNF面上的伯胺相结合对连续流动催化是有效的。由于CHNF气凝胶可以很容易地从自然界中存在的丰富和可再生的甲壳素中制备出来，这一战略是促进和开展绿色和可持续化学的门户。
We demonstrate the fabrication of chitin nanofibril aerogels and their successful application as base catalysts for the production of useful chemicals. Squid-pen chitin nanofibrils (ChNF) with primary C2-amine groups on their crystalline surfaces were fabricated into highly porous aerogels with high specific surface areas up to 289 m(2) g(-1) using freeze-drying or a supercritical drying process. The prepared ChNF aerogel was used in the aqueous Knoevenagel-condensation reaction and acted as a highly efficient base catalyst, suggesting that the combination of the nanofibrous aerogel structure and primary C2-amines exposed on the crystalline ChNF surface was effective for continuous flow catalysis. Because the ChNF aerogel can be easily prepared from abundant and renewable chitin present in nature, this strategy is a gateway to promoting and conducting green and sustainable chemistry.