Studies on Steam Reforming of Light Hydrocarbon over Ni-based Catalysts
Steam reforming of hydrocarbons (CH4, C3H8 and LPG) over Ni-based hydrotalcite catalysts were carried out in a temperature range of 600～850℃, at atmospheric pressure with space velocity of 20,000 h-1 and feed molar ratio of H2O/C = 1.0 ～ 3.0. The prepared catalysts were characterized by BET, TPR, XRD, TEM and SEM. The Ni-based catalysts were prepared by co-precipitation method. Among the prepared Ni-based catalysts, Ni/MgAl catalyst showed the best activity in the steam reforming of CH4 compared to other hydrocarbons used in this study.However, stability of all catalysts did not maintain over 100h due to formation of carbon after the reaction under the tested conditions. C3H8 and LPG were found to be more reactive than CH4 due to the pyrolysis at reaction temperature. Carbon formation for each catalyst was found to be reduced during the reaction. Especially, activity of Ni/MgAl catalyst was improved and was constant for 200h under the tested conditions. However, catalyst deactivation due to sintering of active metal remained a problem. To solve this problem, noble metal modified Ni-based hydrotalcite catalysts were prepared by dipping method. This catalyst showed higher resistance for the sintering of active metal than Ni-based hydrotalcite catalyst prepared by conventional method. Rh modified Ni-based catalyst showed higher resistance to the formation of carbon compared to Ni-based catalysts. The long term stable activity upto 1024h was observed for steam reforming of LPG at 800 ℃. The results suggested that steam reforming of CH4 requires high temperature and S/C ratio Compared to other hydrocarbon gases studied. So, Rh modified Ni-based hydrotalcite catalyst can be considered as promising candidate to apply for the steam reforming of light hydrocarbon.
DAE HYUN KIM BYUNG GWON LEE DONG HYON SHEEN JAE SUK CHOI MYUNG JUN KIM SUK IN HONG DONG JU MOON
Clean Energy Research Center, Korea Institute of Science & Technology, P.O.Box 131,Cheongryang, Seou SK Corporation, 140-1 Wonchon-Dong, Yusung Gu, Daejeon, 305-712, Korea c Department of Chemical & Biological Engineering, Korea University 5-ga, Anam Dong, Sungbukgu, Seoul,
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）