反相微乳法制备Ni/CeO2纳米复合催化剂催化乙醇水蒸气重整制氢

采用W/O反相微乳法制备了Ni/CeO2纳米复合催化剂,对比了加热和真空冷冻两种不同干燥方法处理的催化剂以及传统浸渍法制备的催化剂上乙醇水蒸气重整反应性能。由X射线衍射(XRD)、透射电子显微镜(TEM)、程序升温还原(TPR)和程序升温脱附(TPD)等技术对催化剂进行了表征。实验结果表明,采用反相微乳法制备的Ni/CeO2纳米复合催化剂显示了良好的催化活性和选择性;其中采用真空冷冻干燥处理的催化剂表现出最好的活性,H2产率最高达到42%,CO选择性低至0.35%,并且具有较好的稳定性和抗积炭能力,优于传统浸渍法制备的催化剂。

Hydrogen Production from Steam Reforming of Ethanol Over Ni/CeO2 Nanocomposite Catalysts Prepared by Reverse Microemulsion

Ni/CeO2 nanocomposite catalysts were prepared by water-in-oil reverse microemulsion method.The performance in steam reforming of ethanol on heating drying and vacuum freeze-drying measured catalysts were investigated and compared with that on conventional catalyst prepared by impregnation method.The catalysts were characterized by techniques such as X-ray diffraction(XRD),transmission election microscopy(TEM),temperature programmed reduction(TPR) and temperature programmed desorption(TPD).The noteworthy catalytic activity and selectivity were exhibited on the Ni/CeO2 nanocomposite catalysts prepared by reverse microemulsion method.It was found that the catalyst employing vacuum freeze-drying showed the highest performance,and the yield rate of H2 was around 42% and the selectivity rate of CO was low to 0.35%.The catalysts also exhibited excellent stability and resistance to carbon accumulation,which was better than those on catalyst prepared by conventional impregnation method.