کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6594062 | 457928 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reaction between propargyl radical and 1,3-butadiene to form five to seven membered rings. Theoretical study
ترجمه فارسی عنوان
واکنش بین رادیکال پروپارگیل و 1،3-بوتادین برای تشکیل پنج تا هفت حلقه عضو. مطالعه نظری
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
Propargyl radical addition to 1,3-butadiene seems to be a promising channel to form 5-, 6-, and 7-membered rings. These are important steps in the growth of polycyclic aromatic hydrocarbons and soot platelets. The reaction mechanism, involving 97 intermediates and 115 transition structures, was studied by CBS-QB3 method (reported here) and density functional theory. All these structures were included in the subsequent RRKM study at different combustion pressures (PÂ =Â 30-0.01Â atm) and temperatures (TÂ =Â 1200-2100Â K). At PÂ =Â 30Â atm, open-chain products dominate in the whole range of temperatures. The importance of 5- and 6-membered rings rises with T, reaching a maximum in the T range 1500-1800Â K. A more modest yield in 7-rings is present at TÂ =Â 1500Â K. At PÂ =Â 1Â atm, in the range 1200-1500Â K, the yield in 5-and 6-rings dominate. 5- and 6-rings yields are about 41% at 1200Â K (CBS-QB3 data). At PÂ =Â 0.1 atm, 6-rings become the main products a 1000Â K (35%), and then they decrease to 12% (2100Â K) and 5-rings rise up to 44% (1200Â K), and then decrease to 14% (2100Â K). Open-chains are the main products at TÂ <Â 1000Â K and TÂ >Â 1500Â K. Then, at PÂ =Â 0.01 atm, open-chain products are important below 900Â K and above 1500Â K,6-rings are main contributors between 900Â K and 1500Â K. 6-Rings reach a maximum yield of 47% (1200Â K) and 5-rings 44% (1200Â K) and 7-rings 17% (900Â K). The main products form through to H losses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 168, June 2016, Pages 331-341
Journal: Combustion and Flame - Volume 168, June 2016, Pages 331-341
نویسندگان
Daniela Trogolo, Andrea Maranzana, Giovanni Ghigo, Glauco Tonachini,