کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6632179 | 1424948 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Biomass to hydrogen-rich gas via steam reforming of raw bio-oil over Ni/La2O3-αAl2O3 catalyst: Effect of space-time and steam-to-carbon ratio
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
Hydrogen-rich gas production by steam reforming (SR) of the raw bio-oil was studied in a continuous two-step system, with the first unit of thermal treatment (at 500â¯Â°C) used for retaining the pyrolytic lignin. The remaining volatile stream was reformed in the second unit (fluidized bed reactor) over a Ni/La2O3-αAl2O3 catalyst at 700â¯Â°C. The effect of space-time (0.04-0.38â¯gcatalysth/gbio-oil) and steam-to-carbon ratio (S/C) (1.5-6) on bio-oil conversion and product yields was assessed. Temperature programmed oxidation (TPO) was used to analyze the coke deposited on the Ni/La2O3-αAl2O3 catalyst. It was found that a raise in both the space-time and the S/C ratio contribute to increasing the H2 yield and to decreasing that of CO, CH4 and C2-C4 hydrocarbons. Catalyst deactivation is highly attenuated by raising space-time because of the lower deposition of encapsulating coke, which is directly related to the concentration of bio-oil oxygenates in the reaction medium. Space-time does not affect the formation of filamentous coke (less responsible for deactivation). The S/C ratio has less influence on total coke content than space time. For 700â¯Â°C, 0.38â¯gcatalysth/gbio-oil and S/Câ¯=â¯6, a hydrogen-rich gaseous stream (66â¯vol% H2) is obtained, with the H2 yield being 93% based on the bio-oil entering the catalytic reactor (or 87% based on the raw bio-oil fed into the two-step system), which decreases to 70% after 7â¯h time on stream as a consequence of the low catalyst deactivation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 216, 15 March 2018, Pages 445-455
Journal: Fuel - Volume 216, 15 March 2018, Pages 445-455
نویسندگان
Beatriz Valle, Borja Aramburu, Pedro Luis Benito, Javier Bilbao, Ana G. Gayubo,