کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9607796 | 46028 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-pressure catalytic combustion of gasified biomass in a hybrid combustor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: High-pressure catalytic combustion of gasified biomass in a hybrid combustor High-pressure catalytic combustion of gasified biomass in a hybrid combustor](/preview/png/9607796.png)
چکیده انگلیسی
Catalytic combustion of synthetic gasified biomass was conducted in a high-pressure facility at pressures ranging from 5 to 16 bars. The catalytic combustor design considered was a hybrid monolith (400 cpsi, diameter 3.5 cm, length 3.6 cm and every other channel coated). The active phase consisted of 1 wt.% Pt/γ-Al2O3 with wash coat loading of total monolith 15 wt.%. In the interpretation of the experiments, a two-dimensional boundary layer model was applied successfully to model a single channel of the monolith. At constant inlet velocity to the monolith the combustion efficiency decreased with increasing pressure. A multi-step surface mechanism predicted that the flux of carbon dioxide and water from the surface increased with pressure. However, as the pressure (i.e. the Reynolds number) was increased, unreacted gas near the center of the channel penetrated significantly longer into the channel compared to lower pressures. For the conditions studied (λ = 4-6, Tin = 218-257 °C and residence time â¼5 ms), conversion of hydrogen and carbon monoxide were diffusion limited after ignition, while methane never ignited and was kinetically controlled. According to the kinetic model surface coverage of major species changed from CO, H and CO2 before ignition to O, OH, CO2 and free surface sites after ignition. The model predicted further that for constant mass flow combustion efficiency increased with pressure, and was more pronounced at lower pressures (2.5-10 bar) than at higher pressures (>10 bar).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 293, 28 September 2005, Pages 129-136
Journal: Applied Catalysis A: General - Volume 293, 28 September 2005, Pages 129-136
نویسندگان
J.C.G. Andrae, D. Johansson, M. Bursell, R. Fakhrai, J. Jayasuriya, A. Manrique Carrera,