Synthesis of Ethyl-4-ethoxy Pentanoate by Reductive Etherification of Ethyl Levulinate in Ethanol on Pd/SiO2-C Catalysts
Synthesis of Ethyl-4-ethoxy Pentanoate by Reductive Etherification of Ethyl Levulinate in Ethanol on Pd/SiO2-C Catalysts
复制标题
Pd/SiO2-C 催化剂乙醇中乙酰丙酸乙酯还原醚化合成 4-乙氧基戊酸乙酯
DOI：
10.1002/cssc.201801624
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发表时间：
2018
期刊：
影响因子：
8.4
通讯作者：
Wu Peng
中科院分区：
文献类型：
--
作者：
Cui Qianqian;Long Yinshuang;Wang Yun;Wu Haihong;Guan Yejun;Wu Peng
The synthesis of biomass‐derived ethers to be used as biofuels or biofuel additives has attracted much attention. Following the recently reported synthesis of etherified ester ethyl‐4‐ethoxy pentanoate (EEP) from γ‐valerolactone (GVL) in ethanol catalyzed by H‐beta zeolite, an alternative route to prepare EEP in high yield has been developed by reductive etherification of ethyl levulinate (EL) in ethanol at 140 °C under 0.5 MPa H2with a silica‐modified Pd/C catalyst. The ether production likely follows a tandem acetalization–hydrogenolysis process with ethyl‐4,4‐diethoxy pentanoate (EDEP) as the intermediate. The acetalization step can be favored by introducing acidic materials, such as SiO2–carbon or beta zeolite, as a cocatalyst. The combination of the Pd/SiO2‐C and beta zeolite mixture leads to 100 % EL conversion and 93 % EEP selectivity under optimized reaction conditions. For the first time, the standard molar combustion enthalpy of as‐prepared EEP is measured by using a static oxygen bomb, and the value of which is determined to be about −5658 kJ mol−1, which is much larger than that of GVL (−2650 kJ mol−1).
