Chemical reaction CO+OH • → CO2+H• autocatalyzed by carbon dioxide: Quantum chemical study of the potential energy surfaces
- Univ. of Central Florida, Orlando, FL (United States); National Research Nuclear Univ. MEPhl, Moscow (Russia)
- Univ. of Central Florida, Orlando, FL (United States)
- Mechanical and Aerospace Engineering Univ. of Central Florida, Orlando, FL (United States)
The supercritical carbon dioxide medium, used to increase efficiency in oxy combustion fossil energy technology, may drastically alter both rates and mechanisms of chemical reactions. Here we investigate potential energy surface of the second most important combustion reaction with quantum chemistry methods. Two types of effects are reported: formation of the covalent intermediates and formation of van der Waals complexes by spectator CO2 molecule. While spectator molecule alter the activation barrier only slightly, the covalent bonding opens a new reaction pathway. The mechanism includes sequential covalent binding of CO2 to OH radical and CO molecule, hydrogen transfer from oxygen to carbon atoms, and CH bond dissociation. This reduces the activation barrier by 11 kcal/mol at the rate-determining step and is expected to accelerate the reaction rate. The finding of predicted catalytic effect is expected to play an important role not only in combustion but also in a broad array of chemical processes taking place in supercritical CO2 medium. Furthermore, tt may open a new venue for controlling reaction rates for chemical manufacturing.
- Research Organization:
- Univ. of Central Florida, Orlando, FL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Federal Energy Management Program Office; USDOE Office of Fossil Energy (FE)
- Grant/Contract Number:
- FE0025260
- OSTI ID:
- 1329521
- Journal Information:
- Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 120, Issue 30; ISSN 1089-5639
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Extension of the HCOOH and CO 2 solid-state reaction network during the CO freeze-out stage: inclusion of H 2 CO
|
journal | June 2019 |
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 |
HOCO formation in astrochemical environments by radical-induced H-abstraction from formic acid
|
journal | September 2018 |
Extension of the HCOOH and CO2 solid-state reaction network during the CO freeze-out stage: inclusion of H2CO | text | January 2019 |
Similar Records
Quantum Chemical Study of Supercritical Carbon Dioxide Effects on Combustion Kinetics
Quantum chemical and master equation study of OH + CH 2 O → H 2 O + CHO reaction rates in supercritical CO 2 environment