花状微球NiO/CeO_2催化剂上乙醇水蒸气重整制氢研究

Hydrogen production by steam reforming of ethanol over flowerlike micro spheres NiO/CeO_2 catalyst

用水热法制备微米尺寸CeO2花状微球粉体,并通过浸渍/热分解法在该粉体上担载纳米尺寸的NiO颗粒,制得催化剂NiO/CeO2。对催化剂进行了XRD、SEM、XES和BET物性表征。经固定床反应器对催化剂的催化性能进行测试。装载1.0 g催化剂,液体处理量0.05 mL/min。结果表明,该方法合成的催化剂NiO/CeO2对低温乙醇水蒸气重整反应表现出较高的活性和稳定性。同时通过微量Cr、Zn、Cu的加入在低温区抑制了CO、CH4的生成,提高了H2的产率和催化剂的抗积炭能力。该催化剂连续稳定性测试达到2 000 h;进行反复起动稳定性测试12次后,未表现出失活特征。

CeO2 samples were prepared by the hydrothermal method.The NiO/CeO2 catalyst was prepared by impregnation.The catalyst was characterized by means of X-ray diffraction（XRD）,Scanning Electronic Microscope（SEM） combined by the X-ray energy spectrometer（XES） and BET area.The catalysis properties of the catalysts were tested using a fix bed micro-reactor fitted in a programmable oven.1.0 g catalyst was loaded and the in-flow liquid was 0.05 mL/min.Results showed that NiO/CeO2 had high activity and stability on low temperature ethanol steam reforming reaction.And,trace amount of Cr,Zn,Cu were added to inhibit CO,CH4 formation and to improve the yield of H2 as well the resistance to carbon deposition greatly.Catalyst stability was achieved in more than 2 000 h reaction.Cycle test repeated 12 times and showed high stability and good catalytic activity.