dc.contributor.authorNurkowski, Daniel
dc.contributor.authorKlippenstein, Stephen J.
dc.contributor.authorGeorgievskii, Yuri
dc.contributor.authorVerdicchio, Marco
dc.contributor.authorJasper, Ahren W.
dc.contributor.authorAkroyd, Jethro
dc.contributor.authorMosbach, Sebastian
dc.contributor.authorKraft, Markus
dc.date.accessioned2015-05-25T03:08:51Z
dc.date.available2015-05-25T03:08:51Z
dc.date.copyright2015en_US
dc.date.issued2015
dc.identifier.citationNurkowski, D., Klippenstein, S. J., Georgievskii, Y., Verdicchio, M., Jasper, A. W., Akroyd, J., et al. (2015). Ab initio variational transition state theory and master equation study of the reaction (OH)3SiOCH2 + CH3 ⇌ (OH)3SiOC2H5. Zeitschrift fur physikalische chemie, 229(5), 691-708.en_US
dc.identifier.urihttp://hdl.handle.net/10220/25660
dc.description.abstractIn this paper we use variable reaction coordinate variational transition state theory (VRC-TST) to calculate the reaction rate constants for the two reactions, R1: (OH)3SiOCH2 + CH3 ⇌ (OH)3SiOC2H5, and R2: CH2OH + CH3 ⇌ C2H5OH. The first reaction is an important channel during the thermal decomposition of tetraethoxysilane (TEOS), and its rate coefficient is the main focus of this work. The second reaction is analogous to the first and is used as a basis for comparison. The interaction energies are obtained on-the-fly at the CASPT2(2e,2o)/cc-pVDZ level of theory. A one-dimensional correction to the sampled energies was introduced to account for the energetic effects of geometry relaxation along the reaction path. The computed, high-pressure rate coefficients were calculated to be, R1: k1 = 2.406 × 10−10T−0.301 exp (− 271.4/T) cm3 molecule–1 s–1 and R2: k2 = 1.316 × 10−10T−0.189 exp (− 256.5/T) cm3 molecule–1 s–1. These rates differ from each other by only 10% – 30% over the temperature range 300–2000 K. A comparison of the computed rates with experimental data shows good agreement and an improvement over previous results. The pressure dependency of the reaction R1 is explored by solving a master equation using helium as a bath gas. The results obtained show that the reaction is only weakly pressure dependent over the temperature range 300–1700 K, with the predicted rate constant being within 50% of its high-pressure limit at atmospheric pressure.en_US
dc.language.isoenen_US
dc.relation.ispartofseriesZeitschrift fur physikalische chemieen_US
dc.rights© 2015 De Gruyter. This paper was published in Zeitschrift fur Physikalische Chemie and is made available as an electronic reprint (preprint) with permission of De Gruyter. The paper can be found at the following official DOI: [http://dx.doi.org/10.1515/zpch-2014-0640]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.en_US
dc.subjectDRNTU::Science::Medicine::Biomedical engineering
dc.titleAb initio variational transition state theory and master equation study of the reaction (OH)3SiOCH2 + CH3 ⇌ (OH)3SiOC2H5en_US
dc.typeJournal Article
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen_US
dc.identifier.doihttp://dx.doi.org/10.1515/zpch-2014-0640
dc.description.versionPublished versionen_US


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