| 학회 |
한국재료학회 |
| 학술대회 |
2017년 가을 (11/15 ~ 11/17, 경주 현대호텔) |
| 권호 |
23권 2호 |
| 발표분야 |
E. 환경/센서 재료 분과 |
| 제목 |
First Principles Computational Study on Hydrolysis of Hazardous Chemicals Phosphorus Trichloride and Oxychloride (PCl3 and POCl3) Catalyzed by Molecular Water Clusters |
| 초록 |
Using first principles calculations we unveil fundamental mechanism of hydrolysis reactions of two hazardous chemicals PCl3 and POCl3 with explicit molecular water clusters nearby. It is found that the water molecules play a key role as a catalyst significantly lowing activation barrier of the hydrolysis via transferring its protons to reaction intermediates. Interestingly, torsional angle of the molecular complex at transition state is identified as a vital descriptor on the reaction rate. Analysis of charge distribution over the complex further reinforces the finding with atomic level correlation between the torsional angle and variation of the orbital hybridization state of phosphorus (P) in the complex. Electronic charge separation (or polarization) enhances thermodynamic stability of the activated complex and reduces the activation energy through hydrogen bonding network with water molecules nearby. Calculated potential energy surfaces (PES) for the hydrolysis of PCl3 and POCl3 depict their two contrastingly different profiles of double- and triple-depth wells, respectively. It is ascribed to the unique double-bonding O=P in the POCl3. Our results on the activation free energy show well agreements with previous experimental data within 7 kcalmol-1 deviation. |
| 저자 |
정현욱, 강준희, 전호제, 한병찬
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| 소속 |
연세대 |
| 키워드 |
First principles; Hazardous chemicals; Phosphorus trichloride; Phosphorus oxychloride; Water-catalyzed hydrolysis
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| E-Mail |
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