Chemistry Graduate Program, Department of Chemistry, Faculty of Science, Mahidol University, Rama VI Rd, Rajathevi, Bangkok, 10400, Thailand.
Faculty of Science, Mahidol University, 999 Phuttamonthon Sai 4 Rd, Salaya, Nakhon Pathom, 73170, Thailand.
Chem Asian J. 2017 Dec 14;12(24):3178-3186. doi: 10.1002/asia.201701369. Epub 2017 Nov 14.
Carbon-based solid acid catalysts were successfully obtained via one-step hydrothermal carbonization (HTC) of water hyacinth (WH) in the presence of p-toluenesulfonic acid (PTSA). Increasing the HTC temperature from 180 to 240 °C resulted in carbonaceous materials with increased sulfur content and less adsorbed water. The material obtained at 220 °C (WH-PTSA-220) contains the highest amount of acid sites and promotes the highest initial rate of two transformations, that is, methanolysis of oleic acid and dehydration of xylose to furfural. While all PSTA-treated WH catalysts gave comparable fatty acid conversions (≈97 %) and furfural yields (≈60 %) after prolonged reaction times, the WH-PTSA-240 system bearing a relatively low acid density maintains the most favorable reusability profile. Higher HTC temperatures (220-240 °C) improved the catalyst reusability profiles due to graphitization and hydrophobicity of the carbon surface. The catalyst systems derived herein from biomass may have potential applications in biorefining platforms, utilizing the conversion of waste biomass to chemicals.
通过在对甲苯磺酸 (PTSA) 的存在下一步水热碳化 (HTC) 水葫芦 (WH)，成功获得了基于碳的固体酸催化剂。将 HTC 温度从 180°C 升高到 240°C 导致含碳材料的硫含量增加，吸附水减少。在 220°C 下获得的材料（WH-PTSA-220）含有最多的酸位，并促进了两种转化的初始速率最高，即油酸的甲醇解和木糖的脱水生成糠醛。虽然所有经过 PSTA 处理的 WH 催化剂在延长反应时间后都能得到相当的脂肪酸转化率（≈97%）和糠醛产率（≈60%），但具有相对较低酸密度的 WH-PTSA-240 体系保持了最有利的可重复使用性。较高的 HTC 温度（220-240°C）由于碳表面的石墨化和疏水性提高了催化剂的可重复使用性。本文中源自生物质的催化剂体系可能在生物精炼平台中有潜在的应用，利用废生物质转化为化学品。
