0 引言
Fig. 1 Main paths of low temperature oxidation for DEE图1 乙醚低温氧化的主要路径 |
1 计算方法
1.1 量子化学方法
Table 1 Average error relative to CCSD(T)-F12a/jun-cc-pVTZ表1 相对于CCSD(T)-F12a/jun-cc-pVTZ的平均误差 |
方法/基组 | 相对能量/(kJ/mol) |
---|---|
CCSD(T)-F12a/jun-cc-pVTZ | 0.00 |
BHHLYP-cc-pVDZ | 1.55 |
WB97X-D-cc-pVDZ | 2.22 |
BHHLYP-MG3S | 2.30 |
BHHLYP-jun-cc pVTZ | 2.39 |
BHHLYP-jul-cc-pVTZ | 2.39 |
BHHLYP-aug-cc-pVTZ | 2.39 |
BHHLYP-def2-TZVPP | 2.43 |
M05-2x-cc-pVDZ | 2.64 |
WB97X-D-MG3S | 2.97 |
b3lyp-cc-pVDZ | 2.97 |
WB97X-D-jun-cc-pVTZ | 3.06 |
WB97X-D-jul-cc-pVTZ | 3.06 |
WB97X-D-aug-cc-pVTZ | 3.06 |
WB97X-D-def2-TZVPP | 3.14 |
TPSSH-cc-pVDZ | 3.14 |
M05-2x-MG3S | 3.39 |
M05-2x-aug-cc-pVTZ | 3.52 |
M05-2x-jun-cc-pVTZ | 3.52 |
M05-2x-jul-cc-pVTZ | 3.52 |
M05-2x-def2-TZVPP | 3.56 |
b3lyp-MG3S | 3.81 |
TPSSH-MG3S | 3.85 |
b3lyp-jun-cc-pVTZ | 3.89 |
b3lyp-jul-cc-pVTZ | 3.89 |
b3lyp-aug-cc-pVTZ | 3.89 |
TPSSH-jun-cc-pVTZ | 3.93 |
TPSSH-jul-cc-pVTZ | 3.93 |
TPSSH-aug-cc-pVTZ | 3.93 |
b3lyp-def2-TZVPP | 3.93 |
1.2 热力学数据及速率常数计算
2 结果和讨论
2.1 分子构象
Fig. 2 Three OOQOOH species and their reaction products图2 三个OOQOOH物种及其反应产物 |
Fig. 3 The population of distinguishable isomers of different species within each relative potential energy range图3 物种在每个相对势能范围内空间异构体的数量布居 |
Fig. 4 Molecular structure of typical transition state图4 典型过渡态分子结构 |
Fig. 5 Local periodicity Mj,τ of species图5 物种的局域周期性Mj,τ |
2.2 热力学参数
Fig. 6 The partition functions obtained using different methods图6 利用不同方法计算获得的配分函数 |
Table 2 Standard entropy, heat capacity, and relative enthalpy calculated using different methods表2 使用不同方法计算得到的标准熵、定压比热容和相对焓 |
物种 | 温度/K | $S_{T}^{0}$/[J/(mol∙K)] | $C_{P}^{0}$/[J/(mol∙K)] | $H_{T}^{0}$/(kJ/mol) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
MS-LH | MS-T | SS-HO | MS-LH | MS-T | SS-HO | MS-LH | MS-T | SS-HO | ||||
OONROOH4hs | 298 | 540.66 | 542.05 | 438.32 | 213.86 | 214.83 | 196.20 | 44.50 | 45.13 | 35.62 | ||
300 | 542.09 | 543.47 | 439.53 | 214.78 | 215.75 | 197.16 | 44.92 | 45.59 | 36.00 | |||
500 | 673.90 | 675.49 | 554.65 | 306.58 | 306.12 | 289.42 | 97.32 | 98.04 | 85.02 | |||
800 | 840.21 | 840.67 | 707.39 | 399.85 | 394.82 | 385.45 | 204.57 | 204.49 | 187.70 | |||
1 200 | 1016.95 | 1 014.23 | 873.66 | 469.59 | 458.66 | 458.53 | 379.88 | 376.57 | 358.11 | |||
OOEROOH5hs | 298 | 538.82 | 539.95 | 434.46 | 225.33 | 226.09 | 196.32 | 44.96 | 45.67 | 35.04 | ||
300 | 540.33 | 541.46 | 435.72 | 226.09 | 226.84 | 197.33 | 45.38 | 46.09 | 35.41 | |||
500 | 675.20 | 676.33 | 552.59 | 308.76 | 307.67 | 291.35 | 98.92 | 99.58 | 84.68 | |||
800 | 841.80 | 841.47 | 707.69 | 399.55 | 394.03 | 388.29 | 206.29 | 206.03 | 188.12 | |||
1 200 | 1018.33 | 1 014.73 | 876.17 | 468.96 | 458.07 | 461.59 | 381.39 | 377.79 | 359.74 | |||
OOpROOH16hs | 298 | 521.70 | 520.03 | 434.34 | 233.66 | 236.01 | 202.10 | 43.33 | 43.58 | 35.66 | ||
300 | 523.29 | 521.62 | 435.64 | 234.58 | 236.93 | 203.10 | 43.79 | 44.04 | 36.08 | |||
500 | 663.56 | 662.35 | 555.65 | 318.55 | 317.55 | 294.69 | 99.42 | 99.84 | 86.27 | |||
800 | 833.52 | 830.71 | 712.12 | 404.03 | 398.30 | 388.29 | 208.88 | 208.25 | 190.17 | |||
1 200 | 1011.21 | 1 005.27 | 880.69 | 470.59 | 460.59 | 459.75 | 385.11 | 381.26 | 361.29 |
2.3 反应速率常数
Fig. 7 The potential energy surface of the lowest energy conformation at the BHHLYP/cc-pVDZ level图7 在BHHLYP/cc-pVDZ级别下最低能量构象的势能面 |
Fig. 8 Multistructural torsional anharmonicity factor of reactions图8 反应的多结构扭转非谐性因子 |
Fig. 9 High pressure limit rate constants in this work (solid lines: MS-CVT/SCT method, denoted as MS; dash lines: SS-CVT/SCT method, as SS) compared with literature data (pQ16 from ref. [10] versus RP16; RN4 from ref. [15] versus RN4; R5-MS from ref. [30] versus RE5)图9 本文计算的高压极限速率常数(实线使用MS-CVT/SCT方法计算,简称MS;虚线使用SS-CVT/SCT方法计算,简称SS)与文献中相似反应的速率常数的比较(pQ16取自文献[10],与RP16比较;RN4取自文献[15],与RN4比较;R5-MS取自文献[30],与反应RE5比较) |
Table 3 Rate fitting of Arrhenius three parameters under high pressure limit表3 高压极限下的速率拟合阿伦尼乌斯三参数 |
反应 | 计算方法 | A/[cm3/(mol∙s)] | n | Ea/(J/mol) |
---|---|---|---|---|
RN4 | SS-CVT/SCT | 9.63 × 10-11 | 6.62 | 47 912.29 |
MS-CVT/SCT | 6.05 × 10-17 | 8.49 | 36 651.23 | |
RE5 | SS-CVT/SCT | 2.13 × 10-9 | 6.25 | 71 028.09 |
MS-CVT/SCT | 3.35 | 8.31 | 58 646.86 | |
RP16 | SS-CVT/SCT | 3.64 × 10-8 | 5.55 | 33 918.53 |
MS-CVT/SCT | 1.92 × 10-12 | 6.84 | 26 152.66 |