An induction period in the pyrolysis of acetylene
Literature Information
Xuejun Xu, Philip D. Pacey
Acetylene was pyrolysed in a flow system between 854 and 970 K, at pressures between 27 and 127 Torr and at residence times between 8 and 1520 ms. Both vinylacetylene and benzene were observed to be primary products, but secondary processes removed vinylacetylene and formed benzene. The orders for the steady-state rates of formation of vinylacetylene and benzene were measured to be 1.8 ± 0.1 and 2.4 ± 0.1, respectively. The corresponding rate constants were found to be, ln(kVA/L mol−1 s−1) = − (165 ± 11) kJ mol−1/RT + (22.7 ± 1.5) and ln(kB/L1.4 mol−1.4 s−1) = − (100 ± 9) kJ mol−1/RT + (15.6 ± 1.1). Induction periods were observed for the first time at these conditions, providing evidence that a free radical process dominates. The order of the initiation reaction was shown to be two. The temperature dependence of the product of the rate constants for the bimolecular, initiation reaction and the termination reaction was determined to be, ln(kikt/L2 mol−2 s−2) = − (261 ± 7) kJ mol−1/RT + (53.1 ± 1.0).
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.











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