کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10611356 | 986061 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Catalyst deactivation in CVD synthesis of carbon nanotubes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Catalyst deactivation in CVD synthesis of carbon nanotubes Catalyst deactivation in CVD synthesis of carbon nanotubes](/preview/png/10611356.png)
چکیده انگلیسی
A computational fluid dynamics (CFD) model with multistep chemical reactions was applied to predict the yield of multiwalled carbon nanotubes produced from our xylene-based chemical vapor deposition (CVD) reactor. Two-step xylene decomposition in the gas phase and catalytic decomposition of hydrocarbons to nanotubes on the growth surfaces were adopted based on exhaust-gas composition measurements. Using the experimentally obtained exhaust-gas concentrations, we conducted inverse calculations to determine apparent rate constants of the catalytic surface reactions. During the CVD process, catalyst deactivation was observed probably due to carbon formation on the catalyst surface. Its effect on the apparent rate constant was empirically correlated with a simple exponential equation. Applying the CFD model, we predicted the local yielding rate of nanotubes along the axis of the reactor. The total yield was then computed by integrating the local yielding rate over the growth surfaces and compared favorably (â¼95%) with the experimental results. The proposed model is expected to help researchers optimize the process parameters to achieve the maximum nanotube yield.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 43, Issue 2, 2005, Pages 253-260
Journal: Carbon - Volume 43, Issue 2, 2005, Pages 253-260
نویسندگان
Kazunori Kuwana, Hajime Endo, Kozo Saito, Dali Qian, Rodney Andrews, Eric A. Grulke,