期刊
APPLIED CATALYSIS A-GENERAL
卷 349, 期 1-2, 页码 204-211出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2008.07.031
关键词
Ethyl lactate; 1,2-Propendiol; CO/SiO2; Hydrogenolysis
资金
- Chinese Academy of Sciences [2007YQNRC19]
- Synfuel CHINA Co. Ltd
Vapor-phase hydrogenolysis of ethyl lactate to 1,2-propanediol was performed over a series of SiO2 supported metal (Fe, Co, Ni, Ru, and Pd) catalysts in a fixed-bed reactor. Among them, the Co/SiO2 and Cu/SiO2 catalysts exhibit promising performance, and the Co/SiO2 were more active than the traditional copper Catalysts Under mild conditions. Effects Of Support, metal loading and preparation method were investigated to optimize the performance of the Co-based catalysts. Over the optimal catalyst (a 10 wt.% Co/SiO2 catalyst prepared via rotary evaporation drying method), the 1,2-propanediol selectivity was in excess of 98% at 90.2% lactate conversion, 2.5 MPa and 160 degrees C. The cobalt catalysts were characterized by X-ray diffraction (XRD) and temperature programmed reduction by H-2 (H-2-TPR) and temperature programmed desorption of H-2 (H-2-TPD). Interestingly, a quasi-linear correlation is observed between the average reaction rate and the percentage of bulk-like Co3O4 phase precursors, suggesting that the metallic cobalt from the bulk-like Co3O4 phase precursor is more active than that from the cobalt surface support species. The emerging technologies for production of low-cost lactate ester, make this high-yield route a sustainable benign process for 1,2-propanediol. (c) 2008 Elsevier B.V. All rights reserved.
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