陕西理工学院学报(自然科学版)
陝西理工學院學報(自然科學版)
협서리공학원학보(자연과학판)
JOURNAL OF SHAANXI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE EDITION)
2015年
2期
50-55,61
,共7页
C7 H15自由基%β位断裂%CBS-QB3%反应机理%速率常数
C7 H15自由基%β位斷裂%CBS-QB3%反應機理%速率常數
C7 H15자유기%β위단렬%CBS-QB3%반응궤리%속솔상수
heptane radicals%β-scission%CBS-QB3%reaction mechanism%rate constant
采用CBS-QB3方法构建了C7 H15自由基裂解反应势能剖面。计算结果表明,4种不同构型的C7 H15自由基(1-C7 H15,2-C7 H15,3-C7 H15,4-C7 H15)发生多种不同类型的β位断裂,裂解成C2—C6烯烃和新的自由基。新的自由基继续发生β位断裂,形成诸如CH3自由基以及CH2眫CH2、CH3 CH眫CH2等烯烃。此外,利用VKLab程序包及Wigner 校正模型在200~3000 K温度范围内计算了4种C7 H15自由基各类β位断裂反应速率常数。其中1-C3 H7→C2 H4+CH3反应速率常数的结果与试验结果非常吻合。
採用CBS-QB3方法構建瞭C7 H15自由基裂解反應勢能剖麵。計算結果錶明,4種不同構型的C7 H15自由基(1-C7 H15,2-C7 H15,3-C7 H15,4-C7 H15)髮生多種不同類型的β位斷裂,裂解成C2—C6烯烴和新的自由基。新的自由基繼續髮生β位斷裂,形成諸如CH3自由基以及CH2眫CH2、CH3 CH眫CH2等烯烴。此外,利用VKLab程序包及Wigner 校正模型在200~3000 K溫度範圍內計算瞭4種C7 H15自由基各類β位斷裂反應速率常數。其中1-C3 H7→C2 H4+CH3反應速率常數的結果與試驗結果非常吻閤。
채용CBS-QB3방법구건료C7 H15자유기렬해반응세능부면。계산결과표명,4충불동구형적C7 H15자유기(1-C7 H15,2-C7 H15,3-C7 H15,4-C7 H15)발생다충불동류형적β위단렬,렬해성C2—C6희경화신적자유기。신적자유기계속발생β위단렬,형성제여CH3자유기이급CH2미CH2、CH3 CH미CH2등희경。차외,이용VKLab정서포급Wigner 교정모형재200~3000 K온도범위내계산료4충C7 H15자유기각류β위단렬반응속솔상수。기중1-C3 H7→C2 H4+CH3반응속솔상수적결과여시험결과비상문합。
The potential energy surfaces of theβ-scission of heptane radicals were performed using the CBS-QB3 method.The results show that the β-scission of 1-C7 H15 , 2-C7 H15 , 3-C7 H15 and 4-C7 H15 radicals involves many different kinds of β-scission reactions to produce olefins and other radicals.Compared to the small n-alkanes, larger n-alkanes can produce more alkyl radicals, which may generate more intermediates and have more possible pathways.Main products were C2~C6 olefins, methyl raticals and hydrogen radicals. The rate constants of all reactions with Eckart correction were calculated by the VKLab program package.The rate constant of 1-C3 H7→C2 H4 +CH3 reaction within the temperature range of 200~3 000 K is in good agree-ment with available experimental values.