School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; Department of Chemistry and Environmental Science, School of Science, Tibet University, Lhasa 850000, China.
Sci Total Environ. 2018 Aug 15;633:426-432. doi: 10.1016/j.scitotenv.2018.03.209. Epub 2018 Mar 28.
Conversion of levulinic acid (LA) to γ-valerolactone (GVL) over a ruthenium-carbon (Ru/C) catalyst using formic acid (FA) as the sole hydrogen source in cellulose hydrolysis process was investigated. The reaction was accelerated using Ru(5wt%)/C as the catalyst and by adding triethylamine. The highest LA conversion (87.26%) and GVL yield (80.75%) were obtained using 10g/mol (LA) catalyst and 150mL/mol (LA) triethylamine at 160°C for 180min. In this reaction, the hydrogenation process can only be accomplished in the presence of FA, which is the byproduct of LA production from cellulose hydrolysis. The application of this new route not only improves the economy of the process, but also avoids the energy-costly separation of LA from the LA and FA aqueous mixture. A new reaction pathway for the conversion of LA and FA into GVL over Ru/C with triethylamine was proposed.
在纤维素水解过程中，使用甲酸 (FA) 作为唯一的氢源，研究了将乙酰丙酸 (LA) 转化为 γ-戊内酯 (GVL) 的反应。使用 Ru(5wt%)/C 作为催化剂并添加三乙胺可以加速反应。在 160°C 下反应 180min 时，使用 10g/mol（LA）催化剂和 150mL/mol（LA）三乙胺，可获得最高的 LA 转化率（87.26%）和 GVL 产率（80.75%）。在该反应中，只有在 FA 的存在下才能完成加氢过程，FA 是 LA 从纤维素水解生产的副产物。该新工艺的应用不仅提高了工艺的经济性，而且避免了从 LA 和 FA 水溶液混合物中分离 LA 所需的高能耗。提出了一种在 Ru/C 存在下使用三乙胺将 LA 和 FA 转化为 GVL 的新反应途径。
