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Thermodynamic analysis of the steam reforming of biofuel model compounds using CaO, and Na2ZrO3, as CO2 absorbents was performed to determine favorable operating conditions to produce a high hydrogen ratio (HR, molsH2 produced/molsHC fed) and concen- tration (%H2) gas product. Biofuel compounds (HC’s) used were: 2,4-dimethylphenol (DMP), furfural (FUR) and vanillin (VAI). Equilib- rium product compositions were studied at 300-850°C, steam to hydrocarbon molar ratio (S/HC) and CO2 absorbent at 1 atm. S/HC varied from stoichiometric; 15:1 (DMP), 13:1 (VAI) and 8:1 (FUR) to twice and trice their stoichiometric values, respectively. At stoichiometric S/HC ratios results indicate significant carbon formation with conventional reforming at T < 600°C, with no carbon formation using ab- sorbents with any of the HC’s. The use of a CO2 absorbent resulted in an increase in HR and H2 purity of about 3 and 30% higher, respec- tively. The order from high to low HR was: VA>DMP>FUR.
Absorption-Enhanced-Reforming, Biofuel, CO2-absorbent, thermodynamic analysis
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