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Rahman RK, Raj A. A reaction kinetics study and model development to predict the formation and destruction of organosulfur species (carbonyl sulfide and mercaptans) in Claus furnace. INT J CHEM KINET 2018. [DOI: 10.1002/kin.21226] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ramees K. Rahman
- Department of Chemical Engineering and Centre of Catalysis and Separation; The Petroleum Institute; Khalifa University of Science and Technology; Abu Dhabi UAE
| | - Abhijeet Raj
- Department of Chemical Engineering and Centre of Catalysis and Separation; The Petroleum Institute; Khalifa University of Science and Technology; Abu Dhabi UAE
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Cardoso DVV, Cunha LA, Spada RFK, Petty CA, Ferrão LFA, Roberto-Neto O, Machado FBC. Thermochemical and Kinetics of CH 3SH + H Reactions: The Sensitivity of Coupling the Low and High-Level Methodologies. J Phys Chem A 2017; 121:419-428. [PMID: 28005366 DOI: 10.1021/acs.jpca.6b09272] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction system formed by the methanethiol molecule (CH3SH) and a hydrogen atom was studied via three elementary reactions, two hydrogen abstractions and the C-S bond cleavage (CH3SH + H → CH3S + H2 (R1); → CH2SH + H2 (R2); → CH3 + H2S (R3)). The stable structures were optimized with various methodologies of the density functional theory and the MP2 method. Two minimum energy paths for each elementary reaction were built using the BB1K and MP2 methodologies, and the electronic properties on the reactants, products, and saddle points were improved with coupled cluster theory with single, double, and connected triple excitations (CCSD(T)) calculations. The sensitivity of coupling the low and high-level methods to calculate the thermochemical and rate constants were analyzed. The thermal rate constants were obtained by means of the improved canonical variational theory (ICVT) and the tunneling corrections were included with the small curvature tunneling (SCT) approach. Our results are in agreement with the previous experimental measurements and the calculated branching ratio for R1:R2:R3 is equal to 0.96:0:0.04, with kR1 = 9.64 × 10-13 cm3 molecule-1 s-1 at 298 K.
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Affiliation(s)
- Daniely V V Cardoso
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
| | - Leonardo A Cunha
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
| | - Rene F K Spada
- Departamento de Física, Universidade Federal do Espírito Santo , Vitória, 29.075-910, Espírito Santo, Brazil
| | - Corey A Petty
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
| | - Luiz F A Ferrão
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
| | - Orlando Roberto-Neto
- Divisão de Aerotermodinâmica e Hipersônica, Instituto de Estudos Avançados , São José dos Campos, 12.228-001, São Paulo, Brazil
| | - Francisco B C Machado
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
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