Carbon nitride doped VxOy/SBA-15 as highly efficient catalysts for the oxidation of ethyl lactate to ethyl pyruvate
APPLIED CATALYSIS A-GENERAL(2024)
摘要
Development of high-performance heterogeneous catalysts for the selective oxidation of ethyl lactate (EL) to ethyl pyruvate (EP) is very important in the field of sustainable chemistry. In this work, a series of carbon nitride (CN) doped wV(x)O(y)/CN-SBA-15 (w = 0.5-4.8%) catalysts were prepared. The doping of CN could significantly enhance the activity of VxOy/CN-SBA-15 catalyst due to the synergistic effect of V species, CN and SBA-15. The 2.6 VxOy/CN-SBA-15 was identified as the most optimum catalyst, offering a high EL conversion (93.0%) and EP selectivity (98.7%) at 130 degrees C after 3 h of reaction. The O-2-TPD and H-2-TPR results confirmed that the redox properties of 2.6 VxOy/CN-SBA-15 are significantly improved compared with 2.7 VxOy/SBA-15, which plays an important role in the oxidation reaction. In addition, the control experiments indicated that the pyridinic-N rather than pyrrolic-N of the VxOy/CN-SBA-15 catalyst accelerated the oxidation of EL to EP.
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关键词
Ethyl lactate,Ethyl pyruvate,Oxidation reaction,Carbon nitride,Vanadia
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