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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Accurate Calculations of Rate Constants for the Forward and Reverse H2O + CO <-> HCOOH Reactions

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Autor(es):
Vichietti, Rafael Mario ; Keidel Spada, Rene Felipe ; Ferreira da Silva, Alberico Borges ; Correto Machado, Francisco Bolivar ; Andrade Haiduke, Roberto Luiz
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: CHEMISTRYSELECT; v. 2, n. 24, p. 7267-7272, AUG 22 2017.
Citações Web of Science: 2
Resumo

The forward and reverse H2O + CO <-> HCOOH reactions were investigated using high-level methodologies in order to provide accurate thermodynamic and kinetic data between 200 and 4000K. Geometries of reactants, transition state (TS), and product were determined with the Coupled Cluster Theory including single and double excitations (CCSD) along with the cc-pVTZ basis set, whereas associated vibrational frequencies, zero-point energies, and thermal corrections were scaled to consider anharmonicity effects. Besides, the description of electronic energies was improved by means of core-valence correlation and iterative triple-excitation contributions together with a complete basis set extrapolation (E-CBS,E-Delta) in order to achieve accurate values of enthalpies, Gibbs energies, and rate constants. Such rate constants were estimated at the high-pressure limit by variational TS treatments combined with different quantum tunneling approaches. Finally, modified Arrhenius' equations were fitted between 700 and 4000K from our most reliable results. (AU)

Processo FAPESP: 14/23714-1 - Cálculos relativísticos de estrutura eletrônica para avaliação de novos conjuntos de funções de base sem prolapso variacional
Beneficiário:Roberto Luiz Andrade Haiduke
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 17/07707-3 - Estados excitados e natureza poliradicalar de poliacenos e periacenos
Beneficiário:Francisco Bolivar Correto Machado
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 10/18743-1 - Uso de multipolos da teoria quântica de átomos em moléculas e estudos cinéticos em sistemas encontrados no meio interestelar
Beneficiário:Roberto Luiz Andrade Haiduke
Linha de fomento: Auxílio à Pesquisa - Regular