Shock tube study of the H-D exchange reaction between acetylene and deuterium.

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概要

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• H–D exchange reaction between acetylene and deuterium has been investigated in a single-pulse shock tube in the temperature range 1200–1500 K. Empirically, in the C<SUB>2</SUB>HD appearance the order with respect to acetylene was 0.25±0.09, and that with respect to deuterium 1.14±0.15. The rate constant of 1.39 th order for the C<SUB>2</SUB>HD increase was obtained as; <I>k</I>(cm<SUP>1.17</SUP> mol<SUP>−0.39</SUP> s<SUP>−1</SUP>)=(24.4±7.5)×10<SUP>11</SUP>exp((−51200±2400)⁄<I>RT</I>). The isotopic distributions of acetylene and hydrogen as determined by mass spectrometry suggest that C<SUB>2</SUB>D<SUB>2</SUB> and H<SUB>2</SUB> are formed by the subsequent reactions of C<SUB>2</SUB>HD and HD, respectively. A free-radical chain mechanism initiated by the same bimolecular reaction of acetylene, <I>viz.</I> 2C<SUB>2</SUB>H<SUB>2</SUB>→C<SUB>4</SUB>H<SUB>3</SUB>+H, as in the pyrolysis and hydrogenation of acetylene was proposed. A steady-state treatment of the proposed mechanism shows that the empirical rate and concentration dependence of the C<SUB>2</SUB>HD increase are in line with those of the steady-state rate.

• 公益社団法人 日本化学会の論文

著者

• Ogura Hiroo

  Institute of Space and Aeronautical Science, The University of Tokyo

• Ogura Hiroo

  Institute of Space and Aeronautical Science, Tokyo University

関連論文

• Shock tube study on the mechanism of hydrogenation and pyrolysis of acetylene.
• Effect of hydrogen chloride on the pyrolysis of acetylene as studied with a single-pulse shock tube.
• Shock tube study of the H-D exchange reaction between acetylene and deuterium.

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