کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6590122 | 456854 | 2015 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Modeling of CO2-assisted liquid phase oxidation of para-xylene catalyzed by transition metals/bromide
ترجمه فارسی عنوان
مدلسازی اکسیداسیون فاز مایع فسفات از پاراکسیلن کاتالیز شده توسط فلزات گذار / برومید
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
The promoting effect of CO2 on liquid phase oxidation of para-xylene (PX) catalyzed by transition metals/bromide was investigated in batch experiments under conditions of industrial interests such as temperature, pressure, and catalyst. On the basis of free radical chain reaction mechanism of alkyl aromatics oxidation, the kinetic model of CO2-assisted PX oxidation involving six parameters was developed. The model fits the PX oxidation kinetics well with narrow confidence intervals of rate constants under conditions of various CO2 addition, temperatures, and catalysts. It was found that the presence of CO2 could obviously promote the chain initiation reactions that are the rate-limiting steps, while it has no impact on the propagation reaction kinetics. Only the rate constant concerning chain initiation was dependent of different experimental conditions while other model parameters were kept constant. The promoting function of CO2 can be ascribed to the formation of active peroxocarbonate that results from a synergistic interaction of CO2 and O2. This postulated specie may participate in the generation of free radicals by oxidizing CoÐÐ to CoÐÐÐ. Hopefully, the kinetic model proposed in this work can be used to optimize the CO2 assisted PX oxidation process and bring insights into PX oxidation mechanism with the presence of CO2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 127, 4 May 2015, Pages 52-59
Journal: Chemical Engineering Science - Volume 127, 4 May 2015, Pages 52-59
نویسندگان
Jianping Shang, Weizhen Sun, Ling Zhao, Wei-Kang Yuan,