| 钒催化剂选择性氧化乳酸乙酯制丙酮酸乙酯 |
| SELECTIVE OXIDATION OF ETHYL LACTATE TO ETHYL PYRUVATE OVER SUPPORTED VANADIUM CATALYSTS |
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| 摘要: |
| 关键词: 钒催化剂 乳酸乙酯 丙酮酸乙酯 选择性氧化 |
| 基金项目: |
| Abstract: The structure and surface acidity of vanadium oxide supported on α-Al2O3、TiO2、SiO2 have been studied by XRD、IR、TPR and adsorption microcalorimetry. The catalytic performance of the catalysts for selective oxidation of ethyl lactate to ethyl pyruvate was determined in a continuous flow fix-bed reactor. The results showed that the dispersion of vanadium oxide on the supports weakened the V=O bond and actived the terminal oxygen, which increased the reaction activity. On the otherhand, The surface acidity is harmful to the selectivity of ethyl pyruvate. V/α-Al2O3 exhibited a lower conversion since its dispersion is low. The low selectivity on V/SiO2 is due to its fairly strong surface acidity. Addition of K+ weakened the surface acidty and enhanced selectivity of V/SiO2. V/TiO2 exhibited the best activity and selectivity among the catalysts studied because of its weak surface activity. The conversion of ethyl lactate and selectivity to ethyl pyruvate are 97% and 81%, respectively, over the V/TiO2 catalyst at 473K. |
| Keywords: vanadium oxide ethyl lactate ethyl pyruvate selective oxidation |
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| 李康,葛欣,韩毓旺,沈俭一.钒催化剂选择性氧化乳酸乙酯制丙酮酸乙酯[J].无机化学学报,1999,15(6):826-830. |
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