Ce改性Co/SEP催化剂对乙醇重整制氢的影响

Effect of Ce modified Co/SEP catalyst on hydrogen production via ethanol steam reforming

摘要: 采用海泡石（SEP）为载体，通过化学沉淀法制备了Co/SEP和Co-Ce/SEP催化剂，对催化剂进行X射线衍射（XRD）、H₂-程序升温还原（H₂-TPR）和透射电镜（TEM）等表征。结果表明，Ce的加入显著改善催化剂的分散度和还原性；两种催化剂应用于乙醇重整制氢实验，考察Ce的加入、反应时间、反应温度和水碳比（S/C比）对制氢的影响。结果表明，在WHSV为20.5h^-1，水碳比（S/C）为3，反应温度600℃时，Co-Ce/SEP乙醇转化率和氢气产率达到最高，分别为85%和65%。同时Ce的添加能使Co-Ce/SEP拥有更优的活性和稳定性。

Abstract: Co/SEP and Co-Ce/SEP catalysts were prepared by chemical precipitation method with sepiolite (SEP) as support. X-ray diffraction (XRD), H₂-programmed reduction (H₂-TPR) and transmission electron microscopy (TEM) were used to characterize the catalysts. It is proved that the addition of Ce significantly improved the dispersion and reducibility of the catalyst. The effects of Ce addition, reaction time, reaction temperature and steam/carbon (S/C) ratio on hydrogen production were investigated. The results show that the ethanol conversion and hydrogen production of Co-Ce/SEP are the highest values, 85% and 65%, respectively, when the WHSV is 20.5 h^-1, the S/C ratio is 3 and the reaction temperature is 600℃. Meanwhile, the addition of Ce can make Co-Ce/SEP possess superior activity and stability.