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Title: Quantum Chemical Study of Supercritical Carbon Dioxide Effects on Combustion Kinetics

Journal Article · · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory
 [1];  [2];  [3];  [2]
  1. Univ. of Central Florida, Orlando, FL (United States); National Research Nuclear Univ. MEPhl, Moscow (Russia); South Ural State Univ., Chelyabinsk (Russia)
  2. Univ. of Central Florida, Orlando, FL (United States)
  3. Univ. of Central Florida, Orlando, FL (United States); Florida State Univ., Tallahassee, FL (United States)
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In oxy-fuel combustion, the pure oxygen (O2), diluted with CO2 is used as oxidant instead air. Hence, the combustion products (CO2 and H2O) are free from pollution by nitrogen oxides. Moreover, high pressures results in the near-liquid density of CO2 at supercritical state (sCO2). Unfortunately, the effects of sCO2 on the combustion kinetics are far from being understood. In order to assist in this understanding, in this work we are using quantum chemistry methods. Here we investigate potential energy surfaces of important combustion reactions in the presence of carbon dioxide melocule. All transition states, reactant and product complexes are reported for three reactions: H2CO+HO2→HCO+H2O2 (R1), 2HO2→H2O2+O2 (R2), and CO+OH→CO2+H (R3). In the reaction R3, covalent binding of CO2 to OH radical and then CO molecule opens a new pathway, including hydrogen transfer from oxygen to carbon atoms followed by CH bond dissociation. Compared to bimolecular OH+CO mechanism, this pathway reduces the activation barrier by 5 kcal/mol, and is expected to accelerate the reaction. This is the first report of autocatalytic effect in combustion. In case of hydroperoxyl self-reaction 2HO2→H2O2+O2 the intermediates, containing covalent bonds to CO2 were found not to be competitive. However, the spectator CO2 molecule is able to stabilize the cyclic transition state and lower the barrier by 3 kcal/mol. Formation of covalent intermediates was also discovered in H2CO+HO2→HCO+H2O2 reaction, but these specie lead to substantially higher activation barriers which makes them unlikely to play role in hydrogen transfer kinetics. The van der Waals complexation with carbon dioxide also stabilized transition state and reduces reaction barrier. Lastly, these results indicate that CO2 environment is likely to have catalytic effect on combustion reactions, which needs to be included in kinetic combustion mechanisms in supercritical CO2.

Research Organization:
Univ. of Central Florida, Orlando, FL (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); Russian Science Foundation
Grant/Contract Number:
FE0025260; 14-43-00052
OSTI ID:
1353407
Journal Information:
Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 121, Issue 19; ISSN 1089-5639
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Quantum chemical and master equation study of OH + CH 2 O → H 2 O + CHO reaction rates in supercritical CO 2 environment journal November 2018

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