Influence of S/C ratio and temperature on steam reforming of model biogas over a metal-foam-coated Pd-Rh/(CeZrO2-Al2O3) catalyst

Title
Influence of S/C ratio and temperature on steam reforming of model biogas over a metal-foam-coated Pd-Rh/(CeZrO2-Al2O3) catalyst
Author(s)
김기석파르트로이Arun Raju[Arun Raju]
Keywords
NICKEL CONTENT; METHANE
Issue Date
201501
Publisher
ELSEVIER SCI LTD
Citation
FUEL, v.139, pp.314 - 320
Abstract
A model biogas consisting of 60% CH4 and 40% CO2 was reformed by steam at 101.3 kPa pressure over a metal-foam-coated 1.31 wt% [Pd(7)-Rh(1)]/(CeZrO2-Al2O3) catalyst in a tubular reactor at GHSV 10,000 h (1). Reactant conversion, product selectivity, process thermal efficiency and coke formation were evaluated by varying S/C ratio as 1.00-2.00 in the temperature range of 923-1123 K. CO2 in the biogas as well as steam reacted to reform CH4, whose conversion was significantly contributed by dry reforming at 973 K for S/C ratio of 1.25 or 1.50. Dry reforming contribution was attenuated by steam reforming as S/C ratio or reaction temperature increased. H-2/CO selectivity increased and CO/(CO + CO2) selectivity decreased as S/C ratio increased; the former decreased and the latter increased as reaction temperature increased. CO2 conversion was not so high due to the competition of dry reforming with WGS/RWGS. Process thermal efficiency and coke formation were dependent upon S/C ratio and reaction temperature in a rather complicated manner. According to the performance guidelines defined in this study, S/C = 1.50 and 1023 K were selected as optimum steam-biogas reforming condition, at which the catalytic stability was maintained for 200 h onstream period at the increased GHSV of 20,000 h (1). (C) 2014 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/33719http://dx.doi.org/10.1016/j.fuel.2014.08.062
ISSN
0016-2361
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공과대학 > 화학공학부 > Articles
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