Product Identification and Mass Spectrometric Analysis of n-Butane and i-Butane Pyrolysis at Low Pressure |
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Authors: | Yi-jun Zhang Wen-hao Yuan Jiang-huai Cai Li-dong Zhang Fei Qi Yu-yang Li |
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Institution: | 1.National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China;State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China2.State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China3.National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China |
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Abstract: | The pyrolysis of n-butane and i-butane at low pressure was investigated from 823-1823 K in an electrically heated flow reactor using synchrotron vacuum ultraviolet photoionization mass spectrometry. More than 20 species, especially several radicals and isomers, were detected and identified from the measurements of photoionization efficiency (PIE) spectra. Based on the mass spectrometric analysis, the characteristics of n-butane and i-butane pyrolysis were discussed, which provided experimental evidences for the discussion of decomposition pathways of butane isomers. It is concluded that the isomeric structures of n-butane and i-butane have strong influence on their main decomposition pathways, and lead to dramatic differences in their mass spectra and PIE spectra such as the different dominant products and isomeric structures of butene products. Furthermore, compared with n-butane, i-butane can produce strong signals of benzene at low temperature in its pyrolysis due to the enhanced formation of benzene precursors like propargyl and C4 species, which provides experimental clues to explain the higher sooting tendencies of iso-alkanes than n-alkanes. |
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Keywords: | n-Butane i-Butane Flow reactor pyrolysis Synchrotron vacuum ultraviolet photoionization mass spectrometry Product identification Mass spectrometric analysis |
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