The conversion of glycerol to methyl lactate catalyzed by tin-exchanged montmorillonite-supported gold catalysts
The conversion of glycerol to methyl lactate catalyzed by tin-exchanged montmorillonite-supported gold catalysts
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锡交换蒙脱石负载金催化剂催化甘油转化为乳酸甲酯
DOI：
10.1002/jctb.5979
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发表时间：
2019
影响因子：
3.4
通讯作者：
Dong Wen Sheng
中科院分区：
文献类型：
--
作者：
Li Jifan;Li Duo;Liu Chun Ling;Xu Chunli;Dong Wen Sheng
背景甘油是一种多用途的平台化合物，用于生产有价值的化学品。以甲醇为溶剂，一锅法直接转化甘油合成乳酸甲酯，减少了中间步骤，避免了甘油/甲醇混合物的分离。结果采用离子交换和胶体沉积相结合的方法制备了一系列锡(锡)交换蒙脱石(M)负载金催化剂，并设计了金(Au)和固体酸双功能催化剂。这些催化剂用于在甲醇中一锅转化甘油合成乳酸甲酯。Au/Sn(20)-Mt催化剂在2 10℃、3 Mpa的空气中，以0.2 5 L-1甘油甲醇溶液在0.0 7 g催化剂上反应5 h，乳酸甲酯的产率可达5 4%，这主要归功于Au粒子的细小和酸性中心的丰富。丙三醇的转化率在5次循环中基本保持不变，而乳酸甲酯的产率在第一次循环后有所下降，但在随后的4次循环中保持稳定。结论在系列的锡交换Mt负载Au催化剂中，Au/Sn20-Mt具有最高的甘油转化率和乳酸甲酯的产率。Au/Sn(20)-Mt催化剂既含有较小的Au颗粒，又具有丰富的酸性中心，具有良好的催化活性。2019中国化学工业学会
BACKGROUNDGlycerol is a versatile platform compound to produce valuable chemicals. One‐pot direct conversion of glycerol into methyl lactate with methanol as solvent is very attractive, because it can reduce intermediate steps and avoid the separation of glycerol/methanol mixtures.RESULTSA series of tin (Sn)‐exchanged montmorillonite(M)‐supported Au catalysts were prepared by a combination of ion exchange and colloidal deposition methods, and designed as bifunctional catalysts containing gold (Au) and solid acid. These catalysts were employed for one‐pot conversion of glycerol to methyl lactate in methanol. The Au/Sn(20)‐Mt catalyst gave a high yield of methyl lactate of 54% upon conversion of 0.25 mol L–1glycerol methanol solution over 0.07 g catalyst at 210 °C under 3 MPa air for 5 h. The good performance of Au/Sn(20)‐Mt was ascribed to the coexistence of small Au particle and abundance of acid sites. The glycerol conversion remained almost unchanged in the five recycled runs, whereas the methyl lactate yield decreased after the first run but kept stably in the later four catalytic runs.CONCLUSIONSAmong the series of Sn‐exchanged Mt‐supported Au catalysts, Au/Sn(20)‐Mt showed the highest glycerol conversion and methyl lactate yield. Containing both small Au particles and having an abundance of acid sites contributed to the excellent catalytic activity of Au/Sn(20)‐Mt. © 2019 Society of Chemical Industry