A high-temperature study of 2-pentanone oxidation: experiment and kinetic modeling |
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Authors: | Julia Pieper Christian Hemken Rene Büttgen Isabelle Graf Nils Hansen K Alexander Heufer Katharina Kohse-Höinghaus |
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Institution: | 2. Physical Chemical Fundamentals of Combustion (PCFC), RWTH Aachen University, Schinkelstraße 8, D-52062 Aachen, Germany;3. Combustion Research Facility, Sandia National Laboratories, CA 94551, USA |
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Abstract: | Small methyl ketones are known to have high octane numbers, impressive knock resistance, and show low emissions of soot, NOx, and unburnt hydrocarbons. However, previous studies have focused on the analysis of smaller ketones and 3-pentanone, while the asymmetric 2-pentanone (methyl propyl ketone) has not gained much attention before. Considering ketones as possible fuels or additives, it is of particular importance to fully understand the combustion kinetics and the effect of the functional carbonyl group. Due to the higher energy density in a C5-ketone compared to the potential biofuel 2-butanone, the flame structure and the mole fraction profiles of species formed in 2-pentanone combustion are of high interest, especially to evaluate harmful species formations. In this study, a laminar premixed low-pressure (p?=?40 mbar) fuel-rich (??=?1.6) flat flame of 2-pentanone has been analyzed by vacuum-ultraviolet photoionization molecular-beam mass-spectrometry (VUV-PI-MBMS) enabling isomer separation. Quantitative mole fraction profiles of 47 species were obtained and compared to a model consisting of an existing base mechanism and a newly developed high-temperature sub-mechanism for 2-pentanone. High-temperature reactions for 2-pentanone were adapted in analogy to 2-butanone and n-pentane, and the thermochemistry for 2-pentanone and the respective fuel radicals was derived by ab initio calculations. Good agreement was found between experiment and simulation for the first decomposition products, supporting the initial branching reactions of the 2-pentanone sub-mechanism. Also, species indicating low-temperature chemistry in the preheating zone of the flame have been observed. The present measurements of a 2-pentanone flame provide useful validation targets for further kinetic model development. |
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Keywords: | 2-pentanone Laminar premixed flame Photoionization molecular-beam mass-spectrometry Kinetic modeling Thermochemistry |
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