Hydroformylation of 1-Octene over Nanotubular TiO2-supported Amorphous Co-B Catalysts |
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Authors: | SHI Yukun HU Xiaojing ZHU Baolin ZHANG Shoumin HUANG Weiping |
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Institution: | Department of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, The Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education, Tianjin Key Lab of Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, P. R. China |
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Abstract: | TiO2 nanotubes supported amorphous Co-B(Co-B/TNTs) catalyst was prepared via impregnationchemical reduction procedure. The catalyst was characterized with transmission electron microscopy(TEM), ammonia temperature-programmed desorption(NH3-TPD), thermogravimetry-differential thermal analysis(TG-DTA), Fourier transform infrared spectroscopy(FTIR) and Raman spectroscopy. The effects of temperature and ratio of CO to H2 on the hydroformylation of 1-octene were studied. At an optimized reaction temperature(150℃) and volume ratio of CO to H2(2:1), the conversion of 1-octene can reach 97.4% with a selectivity of 23.1% for total aldehydes and n/i-aldehyde molar ratio of 40:60. To obtain higher selectivity for linear aldehydes, Co-B/TNTs modified with triphenylphosphine for the hydroformylation of 1-octene were investigated. When molar ratio of P/Co was 4, the yield of total aldehydes was the highest(31.6%) with a good selectivity for linear product(n/i-aldehyde molar ratio was 70:30). In recycle use, the Co-B/TNTs catalyst modified with triphenylphosphine could be reused five times without reducing the activity and selectivity obviously. For a comparative study, all the Co-B/TNTs to catalyze the hydroformylation of other olefins exhibited high conversion under the optimized conditions. |
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Keywords: | Hydroformylation TiO2 nanotubes Amorphous Co-B 1-Octene |
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