Rate Constants and Energetics of the H2SiO + H Reaction System: RP ‐ VTST / MT and VRC Calculations
Year: 2025
Type: article
Abstract: ABSTRACT Silaformaldehyde (H2SiO) is one of the components of the kinetics roadmap of silane oxidation. For this species, kinetics decomposition is related to three elementary reactions, that is, H + H2SiO → H2 + HSiO (R1), H + H2SiO → H2SiOH (R2), and H + H2SiO → H3SiO (R3). To improve the kinetics of these reaction systems, accurate energetics were computed with the ωB97X‐D and CCSD(T) methods, and the rate constants were determined using CVT methods with multidimensional tunneling. KIEs were also determined for (R1), which is an important path at high temperatures. At the ωB97X‐D/aug‐cc‐pVTZ level, the value of electronic barrier height is 4.5, 5.2, and 0.4 kcal mol−1 for (R1), (R2), and (R3), respectively. In addition to the characterization of the elementary reactions, a mechanism consisting of all interconnected reactions was characterized by using the energy‐grained master equation approach to determine the phenomenological rate constants for the formation of products and the time evolution of the species. Up to 500 K, the main reaction product is H2SiOH, while the bimolecular products H2 + HSiO dominate at higher temperatures.
DOI: 10.1002/jcc.70115
Language: English
Subfield: Fluid Flow and Transfer Processes
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,520
Awards: Theoretical and experimental development of energetic materials applied to chemical propulsion, G1969543518, G2191601353, G2320559679, G295657101, G3126812172, G3690646728, G5534662624, G8083085905, Organic light emitting devices, energy converters via singlet fission and 0D/0D hybrid materials for hydrogen production: computational chemistry approach
OpenAlex ID: W4410482880