کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5418312 | 1506987 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Kinetic study of the reaction H2O2+HâH2O+OH by ab initio and density functional theory calculations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Kinetic study of the reaction H2O2+HâH2O+OH by ab initio and density functional theory calculations Kinetic study of the reaction H2O2+HâH2O+OH by ab initio and density functional theory calculations](/preview/png/5418312.png)
چکیده انگلیسی
Theoretical investigations on the kinetics of the elementary reaction H2O2+HâH2O+OH were performed using the transition state theory (TST). Ab initio (MP2//CASSCF) and density functional theory (B3LYP) methods were used with large basis set to predict the kinetic parameters; the classical barrier height and the pre-exponential factor. The ZPE and BSSE corrected value of the classical barrier height was predicted to be 4.1 kcal molâ1 for MP2//CASSCF and 4.3 kcal molâ1 for B3LYP calculations. The experimental value fitted from Arrhenius expressions ranges from 3.6 to 3.9 kcal molâ1. Thermal rate constants of the title reaction, based on the ab initio and DFT calculations, was evaluated for temperature ranging from 200 to 2500 K assuming a direct reaction mechanism. The modeled ab initio-TST and DFT-TST rate constants calculated without tunneling were found to be in reasonable agreement with the observed ones indicating that the contribution of the tunneling effect to the reaction was predicted to be unimportant at ambient temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure: THEOCHEM - Volume 770, Issues 1â3, 29 September 2006, Pages 149-156
Journal: Journal of Molecular Structure: THEOCHEM - Volume 770, Issues 1â3, 29 September 2006, Pages 149-156
نویسندگان
H. Koussa, M. Bahri, N. Jaïdane, Z. Ben Lakhdar,