Hydrogen production from energy saving ethanol reformer with various catalysts

• Main Authors: Wei-Chen Chiu, 邱韋丞
• Other Authors: Rong-Fang Horng
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/p636tr

碩士 === 崑山科技大學 === 機械工程研究所 === 96 === This study investigated the reforming of bio-fuel, i.e., ethanol, for hydrogen production on energy saving ethanol reformer with various catalysts. Various kinds of metal catalysts (Fe、Co、Ni、Pt、Pd、Rh、Ru) with washcoat of Al2O3 were used. The parameters investigated were O2/EtOH (Oxygen/Ethanol molar ratio), ethanol supply rate, S/C (Water/Ethanol ratio). Hydrogen production by Partial Oxidation Reforming (POX) and Oxidative Steam Reforming (OSR) were applied. The energy saving methods of heat insulation and heat recycling on the reforming performance were compared. The experimental results showed that the noble metal had the favorable reaction at low temperature. The higher hydrogen rich gas concentration was obtained by suitable catalyst and energy saving schemes. The best (H2+CO) concentration of 46.15% was at O2/EtOH of 0.75 by rhodium (Rh) and next was by ruthenium (Ru) about 44.41% with heat recycling. Moreover, the ethanol conversion, concentration of hydrogen and carbon monoxide and the thermal efficiency of reforming were improved by the methods of heat insulation and heat recycling. The thermal efficiency had the most obvious improvement by using Ru catalyst with heat insulation and heat recycling methods. The improvement in thermal efficiency was 19.38% by heat insulation and 39.43% by heat recycling respectively at O2/EtOH of 0.5.With Oxidative Steam Reforming (OSR) and energy saving methods of heat recycling,Under O2/EtOH of 0.625 and S/C of 1.0 improved by hydrogen production. That is, the reforming performance of the reformer system could be improved by energy saving schemes. Therefore, the enhancement in reforming could be obtained by the combination of low-price catalyst and the energy saving system. However, the reverse reaction of H2 which caused the defect in reforming, or even the damage of the catalyst due to the high temperature should be avoided.