Direct rate constant measurements for the reaction of ground-state atomic oxygen with ethylene, 244-1052K

Pressure dependence of the ethene yield from the reaction ethyl radical + oxygen

“…The mechanism by which C2H5 reacts with 02 to form C2H4 is of interest theoretically and experimentally1"6 because of its influence on combustion and atmospheric chemistry. Two channels could yield C2H4 from this reaction: (1) direct abstraction c2h5 + 02 -C2H4 + H02 (1) or (2) a coupled-path mechanism via an excited C2H502 intermediate as proposed by several authors ( The nature of the activated complex, C2H502*, is the subject of ongoing investigation. Several authors (e.g., refs 1 and 5) propose that the reaction proceeds via a C2H402H radical intermediate, while McAdam and Walker6 suggest that a direct decomposition of the cyclic transition state is the preferred path.…”

Rate Constants of the Reactions of O(3P) Atoms with Ethene and Propene over the Temperature Range 230–900 K

“…. The pseudo–first‐order rate constants, k 1 ′ = –d(ln[C 2 H 4 ])/d t = k 1 [O], were corrected for the axial and radial diffusion of C 2 H 4 . The diffusion coefficient of C 2 H 4 in He, D 0 = 375 × ( T /298) 1.75 Torr cm −2 s −1 , was calculated using Fuller's method .…”

“…Figure summarizes the results of temperature dependent studies of the rate constant of reaction (1). One can note a good agreement of the results reported by almost all the research groups.…”

“…The theoretical and practical interests to reactions of O‐atom with ethene and propene have initiated an extensive research, experimental and theoretical, of these reactive systems over the past few decades . Currently, the rate constants of the reactions can be considered as more or less well known (especially for O + C 2 H 4 reaction) over a rather wide temperature range extending from atmospheric temperatures to those in combustion .…”

Fourier Transform Infrared-Probed O(3P) Microreactor: Demonstration with Ethylene Reactions in Argon Matrix

“…20 Several research works on ethylene oxidation by triplet oxygen atoms are available in the literature. 15,16,18,[21][22][23][24][25][26][27][28][29][30][31] Schmoltner et al 16 studied the reaction under single collision conditions using the crossed molecular beam method. They proposed two major primary reaction channels at an average collision energy of about 6 kcal/mol, namely (A) the formation of CH 3 and CHO and (B) the formation of C 2 H 3 O and H. After the addition of O( 3 P) to ethylene forming a triplet oxirane biradical [H 2 C(O•)-C•H 2 , with both unpaired electrons having the same spin], channel (A) occurs by way of intersystem crossing to the singlet state [(H 2 C(O•)-C•H 2 ) again, but now with the unpaired electrons having opposing spins], 1,2-H migration, and subsequent C-C bond rupture.…”